Catalyst support materials, catalysts, methods of making them and uses thereof
View Patent ↗Catalyst support materials, catalysts, methods of making such and uses thereof are described. Methods of making catalyst support material include combining anatase titania slurry with i) a low molecular weight form of silica; and ii) a source of Mo to form a TiO 2 —MoO 3 —SiO 2 mixture. Catalyst support material include from about 86% to about 94% weight anatase titanium dioxide; from about 0.1% to about 10% weight MoO 3 ; and from about 0.1% to about 10% weight SiO 2 . Low molecular weight forms of silica include forms of silica having a volume weighted median size of less than 4 nm and average molecular weight of less than 44,000, either individually or in a combination of two or more thereof. Catalyst include such catalyst support material with from about 0.1 to about 3% weight of V 2 O 5 and optionally from about 0.01% to about 2.5% weight P.
1. A method of making a catalyst support material comprising:
a. providing an anatase titania slurry;
b. providing an amount of phosphate to the anatase titania slurry; and
c. combining the anatase titania slurry with i) low molecular weight form of silica and ii) a source of Mo to form a TiO 2 —MoO 3 —SiO 2 mixture, wherein
the low molecular weight form of silica comprises a member selected from a group consisting of forms of silica having a volume weighted median size of less than 4 nm and average molecular weight of less than 44,000, and combinations thereof.
2. The method of claim 1 , further comprising providing the phosphate after providing i) the low molecular weight form of silica and ii) a source of Mo.
3. A catalyst support material comprising:
from about 86% to about 94% weight anatase titanium dioxide; from about 0.1% to about 10% weight MoO 3 ; from about 0.01% to about 2.5% P; and from about 0.1% to about 10% weight SiO 2 in a low molecular weight form;
wherein the low molecular weight form of SiO 2 comprises a member selected from a group consisting of forms of silica having a volume weighted median size of less than 4 nm and average molecular weight of less than 44,000, and combinations thereof.
4. The catalyst support material of claim 3 comprising:
from about 0.2% to about 5% weight the SiO 2 in a low molecular weight form; from about 0.2% to about 5% weight MoO 3 ; and from about 0.01% to about 2.5% P; and wherein the from about 86% to about 94% weight anatase titanium dioxide comprises anatase titania particles.
5. A catalyst support material comprising:
anatase titanium dioxide; a primary promoter comprising molybdenum oxide and phosphorus oxide; and a volatility inhibitor comprising a low molecular weight form of silica;
wherein the mole ratio of phosphorus to molybdenum is in a range of from about 0.2:1 to about 4:1; and
wherein the low molecular weight form of silica comprises a member selected from a group consisting of forms of silica having a volume weighted median size of less than 4 nm and average molecular weight of less than 44,000, and combinations thereof.
6. A method of making a catalyst support material comprising:
a) providing anatase titania slurry;
b) providing an amount of phosphate to the anatase titania slurry; and
c) combining the anatase titania slurry with
i) volatility inhibitor comprising a low molecular weight form of silica; and ii) primary promoter comprising molybdenum oxide to form a TiO 2 —MoO 3 —SiO 2 mixture;
wherein the low molecular weight form of silica comprises a member selected from a group consisting of forms of silica having a volume weighted median size of less than 4 nm and average molecular weight of less than 44,000, and combinations thereof.
7. The method of claim 6 , further comprising providing the phosphate before providing i) the volatility inhibitor and ii) the primary promoter.
8. A method comprising:
contacting a nitrogen oxide-containing gas or liquid for a time sufficient to reduce the level of NO x in the nitrogen oxide-containing gas or liquid with a catalyst comprising:
from about 86% to about 94% weight anatase titanium dioxide; from about 0.1% to about 10% weight MoO 3 ; from about 0.5% to about 3% weight V 2 O 5 ; from about 0.01% to about 2.5% weight P; and from about 0.1% to about 10% weight SiO 2 in a low molecular weight form,
wherein the low molecular weight form of SiO 2 comprises a member selected from the group consisting of forms of silica having a volume weighted median size of less than 4 nm and average molecular weight of less than 44,000, and combinations thereof.