Lubricant compositions for reduced pre-ignition in hydrogen fueled engines
This invention relates to a method of reducing abnormal combustion events in a hydrogen fueled internal combustion engine (HICE) during operation of the engine. The method includes the steps of: a) providing to the HICE a lubricating oil composition including or resulting from the admixing of: i) a base oil having a viscosity KV100 of less than or equal to 12 cSt and included at greater than 50 wt. % of the composition and comprising a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, or combinations thereof; ii) an overbased magnesium containing detergent comprising an overbased magnesium salicylate, an overbased magnesium sulfonate, an overbased magnesium phenate, or combinations thereof with a Total Base Number (KOH/g) greater than or equal to 9 and less than or equal to 500 and included at treat level to deliver between 100 to 5000 ppm by weight of total magnesium; iii) an overbased metal-containing detergent comprising an overbased metal salicylate detergent, an overbased metal phenate detergent, or combinations thereof with a Total Base Number (KOH/g) greater than or equal to 9 and less than or equal to 500 and included at treat level to deliver between 100 to 5000 ppm by weight of total metal; and wherein the overbased magnesium containing detergent of ii) and the overbased metal-containing detergent of iii) in combination deliver between 0.15 wt. % to 8.0 wt. % of total soap to the composition; iv) at least one zinc dihydrocarbyl dithiophosphate compound included at a treat level to deliver more than 100 ppm by weight of zinc and less than 800 ppm by weight of phosphorus to the composition; v) at least one molybdenum containing compound included at a treat level to deliver between 20 to 2000 ppm by weight of total molybdenum to the composition; vi) at least one silicon containing compound included at a treat level to deliver between 5 to 1000 ppm by weight of total silicon to the composition; and vii) the lubricating oil composition having a total sulfated ash of less than or equal to 2.0 wt. %, a total phosphorous level of less than or equal to 800 ppm by weight and a SAE viscosity grade of 25W-X, 20W-X, 15W-X, 10W-X, 5W-X or 0W-X, where X represents any one of 8, 12, 16, 20, 30, 40, 50 or 60; b) providing a fuel comprising hydrogen to the HICE; and c) combusting the fuel in the HICE. Also provided are a lubricating oil composition and a concentrate for use in a HICE to reduce the propensity for abnormal combustion events.
1 . A method of reducing abnormal combustion events in a hydrogen fueled internal combustion engine (HICE) during operation of the engine comprising:
a) providing to the hydrogen fueled internal combustion engine a lubricating oil composition comprising or resulting from the admixing of:
i) a base oil having a viscosity KV100 of less than or equal to 12 cSt and included at greater than 50 wt. % of the composition and comprising a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, or combinations thereof;
ii) an overbased magnesium containing detergent comprising an overbased magnesium salicylate, an overbased magnesium sulfonate, an overbased magnesium phenate, or combinations thereof with a Total Base Number (KOH/g) greater than or equal to 9 and less than or equal to 500 and included at treat level to deliver between 100 to 5000 ppm by weight of total magnesium;
iii) an overbased metal-containing detergent comprising an overbased metal salicylate detergent, an overbased metal phenate detergent, or combinations thereof with a Total Base Number (KOH/g) greater than or equal to 9 and less than or equal to 500 and included at treat level to deliver between 100 to 5000 ppm by weight of total metal; and
wherein the overbased magnesium containing detergent of ii) and the overbased metal-containing detergent of iii) in combination deliver between 0.15 wt. % to 8.0 wt. % of total soap to the composition;
iv) at least one zinc dihydrocarbyl dithiophosphate compound included at a treat level to deliver more than 100 ppm by weight of zinc and less than 800 ppm by weight of phosphorus to the composition;
v) at least one molybdenum containing compound included at a treat level to deliver between 20 to 2000 ppm by weight of total molybdenum to the composition;
vi) at least one silicon containing compound included at a treat level to deliver between 5 to 1000 ppm by weight of total silicon to the composition; and
vii) the lubricating oil composition having a total sulfated ash of less than or equal to 2.0 wt. %, a total phosphorus level of less than or equal to 800 ppm by weight and a SAE viscosity grade of 25W-X, 20W-X, 15W-X, 10W-X, 5W-X or 0W-X, where X represents any one of 8, 12, 16, 20, 30, 40, 50 or 60;
b) providing a fuel comprising hydrogen to the hydrogen fueled internal combustion engine; and
c) combusting the fuel in the hydrogen fueled internal combustion engine,
wherein the hydrogen fueled internal combustion engine (HICE) operates at a BMEP ranging from 12 bar to 18 bar and at an air:fuel ratio (AFR) from 1:1 to 3:1; and wherein the fuel supplied to the hydrogen fueled internal combustion engine comprises at least 90 mass % hydrogen.
2 . The method of claim 1 , further comprising: d) measuring a number of abnormal pre-ignition events during combustion (1000 rpm, 12 bar BMEP and 1.85 air: fuel ratio (AFR)) and wherein the number of pre-ignition events per 1,000 engine cycles is less than or equal to 3.
3 . The method of claim 1 , further comprising: d) measuring a number of abnormal pre-ignition events during combustion (1200 rpm, 18 bar BMEP and 2.05 air: fuel ratio (AFR)) and wherein the number of pre-ignition events per 1,000 engine cycles is less than or equal to 5.
4 . The method of claim 1 , wherein a frequency of abnormal pre-ignition events in the hydrogen fueled internal combustion engines (HICE) operating at 100% load during combustion is decreased by at least 20% compared to a comparable lubricating oil composition not including the overbased magnesium containing detergent, the overbased metal-containing detergent, the at least one zinc dihydrocarbyl dithiophosphate compound, the at least one molybdenum containing compound, and the at least one silicon containing compound.
5 . The method of claim 1 , wherein the overbased magnesium containing detergent delivers between 400 to 1200 ppm by weight of total magnesium to the lubricating oil composition.
6 . The method of claim 1 , wherein the overbased magnesium containing detergent is an overbased magnesium sulfonate detergent.
7 . The method of claim 1 , wherein the metal of the overbased metal salicylate detergent, the overbased metal phenate detergent, or combinations thereof is selected from the group consisting of calcium, magnesium, sodium, potassium, and lithium.
8 . The method of claim 1 , wherein the overbased metal-containing detergent is an overbased calcium salicylate detergent.
9 . The method of claim 1 , wherein the lubricating oil composition comprises less than 600 ppm by weight of phosphorus.
10 . The method of claim 1 , wherein, the lubricating oil composition comprises up to 900 ppm by weight of zinc.
11 . The method of claim 1 , wherein the hydrocarbyl group of the zinc hydrocarbyl dithiophosphate is derived from one or more primary alcohols, one or more secondary alcohols or a combination of primary and secondary alcohols.
12 . The method of claim 1 , wherein the at least one zinc dihydrocarbyl dithiophosphate comprises zinc dialkyl dithiophosphate.
13 . The method of claim 1 , wherein the at least one molybdenum containing compound is selected from the group consisting of molybdenum amines, molybdenum diamines, molybdenum dithiocarbamate, molybdenum dithiophosphate, molybdenum amine complexes, molybdenum carboxylates, trinuclear molybdenum compounds, sulfides of molybdenum and molybdenum dithiophosphate, molybdenum dithiophosphinates, molybdenum xanthates, molybdenum thioxanthates, molybdenum sulfides, molybdenum dialkyldithiophosphates, molybdenum alkyl xanthates, molybdenum alkylthioxanthates; and combinations thereof.
14 . The method of claim 1 , wherein the at least one molybdenum containing compound is an acidic molybdenum compound selected from the group consisting of molybdic acid, ammonium molybdate, sodium molybdate, potassium molybdate, hydrogen sodium molybdate, MoOC 14 , MoO 2 Br 2 , Mo 2 O 3 C 16 , molybdenum trioxide and combinations thereof.
15 . The method of claim 1 , wherein the at least one molybdenum containing compound is an organo-molybdenum compound of the formula: Mo(R″OCS 2 ) 4 and Mo(R″SCS 2 ) 4 , wherein R″ is an organo group selected from the group consisting of alkyl, aryl, aralkyl and alkoxyalkyl having from 1 to 30 carbon atoms.
16 . The method of claim 1 , wherein the at least one molybdenum containing compound is an organo-trinuclear molybdenum compound of the formula: Mo 3 S k L n Q z , wherein the L is independently selected from ligands having organo groups with a sufficient number of carbon atoms to render the compound soluble or dispersible in the oil, n is from 1 to 4, k is from 4 to 7, Q is selected from group consisting of water, amines, alcohols, phosphines, and ethers, and z is from 0 to 5; and wherein the organo-trinuclear molybdenum compound includes at least 21 carbon atoms.
17 . The method of claim 1 , wherein the at least one molybdenum containing compound delivers between 50 to 500 ppm by weight of total molybdenum to the lubricating oil composition.
18 . The method of claim 1 , wherein the at least one silicon containing compound delivers between 50 to 600 ppm by weight of total silicon to the lubricating oil composition.
19 . The method of claim 1 , wherein the at least one silicon containing compound is selected from the group consisting of siloxane compounds, organo modified siloxane compounds, small molecule silicon compounds, and silazane compounds.
20 . The method of claim 19 , wherein the at least one silicon containing compound is a siloxane compound according to Formula 1,
wherein n is from 50 to 450, and wherein R 1 and R 2 are independently C 1 -C 10 alkyl.
21 . The method of claim 19 , wherein the silicon-containing compound is an organo modified siloxane compound according to Formula 1,
wherein, n is from 50 to 450, and wherein R 1 and R 2 are independently a polyether group, a C 11 -C 100 alkyl group, or a C 6 -C 14 aryl group.
22 . The method of claim 19 , wherein the silicon-containing compound is a small molecule silicon compound having a molecular weight of no more than 600 g/mol.
23 . The method of claim 19 , wherein the silicon-containing compound is a small molecule silicon compound according to Formula 2,
wherein, each of R 1 , R 2 , R 3 and R 4 is, independently, a C 1 -C 10 hydrocarbyl group or a C 1 -C 10 heterocarbyl group.
24 . The method of claim 23 comprising one or more silicon-containing compounds selected from the group consisting of tetraethylsilane (Si(C 2 H 5 ) 4 ), tetraethyl orthosilicate (Si(OC 2 H 5 ) 4 ), triethoxymethylsilane (CH 3 Si(OC 2 H 5 ) 3 ) and tetrabutyl orthosilicate (Si(OC 4 H 9 ) 4 ).
25 . The method of claim 19 , wherein the silicon-containing compound is a silazane compound according to Formula 3,
wherein, each of R 1 and R 2 is, independently, a C 1 -C 3 hydrocarbyl group.
26 . The method of claim 1 , wherein the lubricating oil composition further comprises a corrosion inhibitor selected from the group consisting of corrosion inhibitor a substituted thiadiazole, a substituted benzotriazole, a substituted triazole, a trisubstituted borate, an ethoxylated lauryl alcohol, a nonylphenol ethoxylate, a C 6 to C 20 ethoxylated linear alcohol, or a combination thereof, and is/are includes at a treat level of 0.001 wt. % to 5.0 wt. % of the lubricating oil composition.
27 . A lubricating oil composition for hydrogen fueled internal combustion engines (HICE) comprising or resulting from the admixing of:
i) a base oil having a viscosity KV100 of less than or equal to 12 cSt and included at greater than 50 wt. % of the composition and comprising a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, or combinations thereof;
ii) an overbased magnesium containing detergent comprising an overbased magnesium salicylate, an overbased magnesium sulfonate, an overbased magnesium phenate, or combinations thereof with a Total Base Number (KOH/g) greater than or equal to 9 and less than or equal to 500 and included at treat level to deliver between 100 to 5000 ppm by weight of total magnesium;
iii) an overbased metal-containing detergent comprising an overbased metal salicylate detergent, an overbased metal phenate detergent, or combinations thereof with a Total Base Number (KOH/g) greater than or equal to 9 and less than or equal to 500 and included at treat level to deliver between 100 to 5000 ppm by weight of total metal; and
wherein the overbased magnesium containing detergent of ii) and the overbased metal-containing detergent of iii) in combination deliver between 0.15 wt. % to 8.0 wt. % of total soap to the composition;
iv) at least one zinc dihydrocarbyl dithiophosphate compound included at a treat level to deliver more than 100 ppm by weight of zinc and less than 800 ppm by weight of phosphorus to the composition;
v) at least one molybdenum containing compound included at a treat level to deliver between 20 to 2000 ppm by weight of total molybdenum to the composition; and
vi) at least one silicon containing compound included at a treat level to deliver between 5 to 1000 ppm by weight of total silicon to the composition; and
the lubricating oil composition having a total sulfated ash of less than or equal to 2.0 wt. %, a total phosphorus level of less than or equal to 800 ppm by weight and a SAE viscosity grade of 25W-X, 20W-X, 15W-X, 10W-X, 5W-X or 0W-X, where X represents any one of 8, 12, 16, 20, 30, 40, 50 or 60; and
wherein the hydrogen fueled internal combustion engine (HICE) operates at a BMEP ranging from 12 bar to 18 bar and at an air: fuel ratio (AFR) from 1:1 to 3:1; and wherein the fuel supplied to the hydrogen fueled internal combustion engine comprises at least 90 mass % hydrogen.
28 . The composition of claim 27 , further comprising measuring a number of abnormal pre-ignition events during combustion (1000 rpm, 12 bar BMEP and 1.85 air: fuel ratio (AFR)) and wherein the number of pre-ignition events per 1,000 engine cycles is less than or equal to 3.
29 . The composition of claim 27 , further comprising measuring a number of abnormal pre-ignition events during combustion (1200 rpm, 18 bar BMEP and 2.05 air: fuel ratio (AFR)) and wherein the number of pre-ignition events per 1,000 engine cycles is less than or equal to 5.
30 . The composition of claim 27 , wherein a frequency of abnormal pre-ignition events in the hydrogen fueled internal combustion engines (HICE) operating at 100% load during combustion is decreased by at least 20% compared to a comparable lubricating oil composition not including the overbased magnesium containing detergent, the overbased metal-containing detergent, the at least one zinc dihydrocarbyl dithiophosphate compound, the at least one molybdenum containing compound, and the at least one silicon containing compound.
31 . The composition of claim 27 , wherein the overbased magnesium containing detergent delivers between 400 to 1200 ppm by weight of total magnesium to the lubricating oil composition.
32 . The composition of claim 27 , wherein the overbased magnesium containing detergent is an overbased magnesium sulfonate detergent.
33 . The composition of claim 27 , wherein the metal of the overbased metal salicylate detergent, the overbased metal phenate detergent, or combinations thereof is selected from the group consisting of calcium, magnesium, sodium, potassium, and lithium.
34 . The composition of claim 27 , wherein the overbased metal-containing detergent is an overbased calcium salicylate detergent.
35 . The composition of claim 27 , wherein the lubricating oil composition comprises less than 600 ppm by weight of phosphorus.
36 . The composition of claim 27 , wherein, the lubricating oil composition comprises up to 900 ppm of zinc.
37 . The composition of claim 27 , wherein the hydrocarbyl group of the zinc hydrocarbyl dithiophosphate is derived from one or more primary alcohols, one or more secondary alcohols or a combination of primary and secondary alcohols.
38 . The composition of claim 27 , wherein the at least one zinc dihydrocarbyl dithiophosphate comprises zinc dialkyl dithiophosphate.
39 . The composition of claim 27 , wherein the at least one molybdenum containing compound is selected from the group consisting of molybdenum amines, molybdenum diamines, molybdenum dithiocarbamate, molybdenum dithiophosphate, molybdenum amine complexes, molybdenum carboxylates, trinuclear molybdenum compounds, sulfides of molybdenum and molybdenum dithiophosphate, molybdenum dithiophosphinates, molybdenum xanthates, molybdenum thioxanthates, molybdenum sulfides, molybdenum dialkyldithiophosphates, molybdenum alkyl xanthates, molybdenum alkylthioxanthates; and combinations thereof.
40 . The composition of claim 27 , wherein the at least one molybdenum containing compound is an acidic molybdenum compound selected from the group consisting of molybdic acid, ammonium molybdate, sodium molybdate, potassium molybdate, hydrogen sodium molybdate, MoOC 14 , MoO 2 Br 2 , Mo 2 O 3 C 16 , molybdenum trioxide and combinations thereof.
41 . The composition of claim 27 , wherein the at least one molybdenum containing compound is an organo-molybdenum compound of the formula: Mo(R″OCS 2 ) 4 and Mo(R″SCS 2 ) 4 , wherein R″ is an organo group selected from the group consisting of alkyl, aryl, aralkyl and alkoxyalkyl having from 1 to 30 carbon atoms.
42 . The composition of claim 27 , wherein the at least one molybdenum containing compound is an organo-trinuclear molybdenum compound of the formula: Mo 3 S k L n Q z , wherein the L is independently selected from ligands having organo groups with a sufficient number of carbon atoms to render the compound soluble or dispersible in the oil, n is from 1 to 4, k is from 4 to 7, Q is selected from group consisting of water, amines, alcohols, phosphines, and ethers, and z is from 0 to 5; and wherein the organo-trinuclear molybdenum compound includes at least 21 carbon atoms.
43 . The composition of claim 27 , wherein the at least one molybdenum containing compound delivers between 50 to 500 ppm by weight of total molybdenum to the lubricating oil composition.
44 . The composition of claim 27 , wherein the at least one silicon containing compound delivers between 50 to 600 ppm by weight of total silicon to the lubricating oil composition.
45 . The composition of claim 27 , wherein the at least one silicon containing compound is selected from the group consisting of siloxane compounds, organo modified siloxane compounds, small molecule silicon compounds, and silazane compounds.
46 . The composition of claim 45 , wherein the at least one silicon containing compound is a siloxane compound according to Formula 1,
wherein n is from 50 to 450, and wherein R 1 and R 2 are independently C 1 -C 10 alkyl.
47 . The composition of claim 45 , wherein the silicon-containing compound is an organo modified siloxane compound according to Formula 1,
wherein, n is from 50 to 450, and wherein R 1 and R 2 are independently a polyether group, a C 11 -C 100 alkyl group, or a C 6 -C 14 aryl group.
48 . The composition of claim 45 , wherein the silicon-containing compound is a small molecule silicon compound having a molecular weight of no more than 600 g/mol.
49 . The composition of claim 45 , wherein the silicon-containing compound is a small molecule silicon compound according to Formula 2,
wherein, each of R 1 , R 2 , R 3 and R 4 is, independently, a C 1 -C 10 hydrocarbyl group or a C 1 -C 10 heterocarbyl group.
50 . The composition of claim 49 comprising one or more silicon-containing compounds selected from the group consisting of tetraethylsilane (Si(C 2 H 5 ) 4 ), tetraethyl orthosilicate (Si(OC 2 H 5 ) 4 ), triethoxymethylsilane (CH 3 Si(OC 2 H 5 ) 3 ) and tetrabutyl orthosilicate (Si(OC 4 H 9 ) 4 ).
51 . The composition of claim 45 , wherein the silicon-containing compound is a silazane compound according to Formula 3,
wherein, each of R 1 and R 2 is, independently, a C 1 -C 3 hydrocarbyl group.
52 . The composition of claim 27 , wherein the lubricating oil composition further comprises a corrosion inhibitor selected from the group consisting of corrosion inhibitor a substituted thiadiazole, a substituted benzotriazole, a substituted triazole, a trisubstituted borate, an ethoxylated lauryl alcohol, a nonylphenol ethoxylate, a C 6 to C 20 ethoxylated linear alcohol, or a combination thereof, and is/are includes at a treat level of 0.001 wt. % to 5.0 wt. % of the lubricating oil composition.
53 . The method of claim 1 , wherein the lubricating oil composition further comprises a functionalized polymer at from 0.1 to 10 wt/% of the lubricating oil composition comprising an amide, imide, and/or ester functionalized partially or fully saturated homo-polyisoprene polymer having: i) an Mw/Mn of less than 2, ii) a Functionality Distribution (Fd) value of 3.5 or less, iii) an Mn of 10,000 g/mol or more of the polymer prior to functionalization, and iv) an average functionality (Fv) of 5 to 20 functional group grafts/polymer chain.
54 . The composition of claim 27 further comprising a functionalized polymer at from 0.1 to 10 wt. % of the lubricating oil composition, and
wherein the functionalized polymer comprises an amide, imide, and/or ester functionalized partially or fully saturated homo-polyisoprene polymer having: i) an Mw/Mn of less than 2, ii) a Functionality Distribution (Fd) value of 3.5 or less, iii) an Mn of 10,000 g/mol or more of the polymer prior to functionalization, and iv) an average functionality (Fv) of 5 to 20 functional group grafts/polymer chain.