Method and reactor for cracking hydrocarbon

1. A method for inhibiting coke deposit formation in a hydrocarbon cracking reactor having an inner surface accessible to said hydrocarbon and wherein a hydrocarbon feedstock comprising ethane is cracked in the presence of steam to form ethylene, said inner surface comprising a perovskite material of formula A a B b C c D d O 3−δ , wherein 0<a<1.2, 0≤b≤1.2, 0.9<a+b≤1.2, 0<c<1.2, 0.0≤d≤1.2, 0.9<c+d≤1.2, −0.5<δ<0.5;

A is selected from calcium (Ca), strontium (Sr), barium (Ba), and any combination thereof;

B is selected from lithium (Li), sodium (Na), potassium (K), rubidium (Rb), and any combination thereof;

C is selected from cerium (Ce), zirconium (Zr), antimony (Sb), praseodymium (Pr), titanium (Ti), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), gallium (Ga), tin (Sn), terbium (Tb) and any combination thereof; and

D is selected from lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), erbium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), technetium (Tc), palladium (Pd), silver (Ag), cadmium (Cd), hafnium (Hf), tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), gallium (Ga), indium (In), tin (Sn), antimony (Sb) and any combination thereof, said perovskite material gasifying said coke to produce CO, CO 2 , and hydrogen.

2. The method of claim 1 , wherein A is selected from strontium (Sr) and barium (Ba).

3. The method of claim 1 , wherein C is selected from cerium (Ce), zirconium (Zr), and manganese (Mn).

4. The method of claim 1 , wherein D is selected from cerium (Ce) and yttrium (Y).

5. The reactor of claim 1 , wherein the perovskite material is selected from SrCeO 3 , SrZr 0.3 Ce 0.7 O 3 , BaMnO 3 , BaCeO 3 , BaZr 0.3 Ce 0.5 Y 0.2 O 3 , BaZr 0.1 Ce 0.7 Y 0.2 O 3 , BaZrO 3 , BaCe 0.9 Y 0.1 O 3 , BaCe 0.85 Y 0.15 O 3 , and BaCe 0.8 Y 0.2 O 3 .

6. The method of claim 1 , being operated at a temperature in a range from about 700° C. to about 870° C. and wherein a weight ratio of steam to hydrocarbon feedstock is in a range from about 3:7 to about 7:3.

7. The method as recited in claim 1 wherein said perovskite material is devoid of samarium (Sm), ruthenium (Ru) or rhodium (Rh).

8. The method of claim 1 , wherein said hydrocarbon cracking reactor is operated at a temperature in a range from about 480 to about 600° C.

9. The method of claim 1 , wherein the perovskite material is SrZr 0.3 Ce 0.7 O 3 .

10. The method of claim 1 , wherein the perovskite material is BaZr 0.1 Ce 0.7 Y 0.2 O 3 .

11. The method of claim 1 , wherein the perovskite material is BaCe 0.8 Y 0.2 O 3 .

12. A method for inhibiting coke deposit formation in a hydrocarbon cracking reactor having an inner surface accessible to said hydrocarbon and wherein a hydrocarbon feedstock comprising ethane is cracked in the presence of steam to form ethylene, said inner surface comprising a perovskite material of formula A a B b C c D d O 3−δ , wherein 0<a<1.2, 0≤b≤1.2, 0.9<a+b≤1.2, c is present in an amount of <1.2, 0≤d≤1.2, 0.9<c+d≤1.2, −0.5<δ<0.5; A is selected from calcium (Ca), strontium (Sr), barium (Ba), and any combination thereof;

B is selected from lithium (Li), sodium (Na), and potassium (K), and any combination thereof;

C is a combination of cerium (Ce) and zirconium (Zr); and

D is selected from lanthanum (La), cerium (Ce), praseodymium (Pr), neodymium (Nd), promethium (Pm), europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium (Dy), holmium (Ho), ebium (Er), thulium (Tm), ytterbium (Yb), lutetium (Lu), scandium (Sc), titanium (Ti), vanadium (V), chromium (Cr), manganese (Mn), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), zinc (Zn), yttrium (Y), zirconium (Zr), niobium (Nb), molybdenum (Mo), technetium (Tc), palladium (Pd), silver (Ag), cadmium (Cd), hafnium (HO, tantalum (Ta), tungsten (W), rhenium (Re), osmium (Os), iridium (Ir), platinum (Pt), gold (Au), gallium (Ga), indium (In), tin (Sn), antimony (Sb) and any combination thereof; said perovskite material gasifying said coke to produce CO, CO 2 , and hydrogen.

13. The method as recited in claim 12 wherein said method is conducted at a temperature of between about 480° C. to about 870° C.

14. The method as recited in claim 12 being operated at a temperature in a range of from about 700° C. to about 870° C. and wherein a weight ratio of steam to hydrocarbon feedstock is in a range of about 3:7 to about 7:3.

15. The method as recited in claim 12 wherein said perovskite material is applied to said inner surface as a coating.

16. The method as recited in claim 12 wherein said perovskite material is present in the form of a pressed powder.

17. The method as recited in claim 12 wherein said perovskite material is devoid of samarium (Sm), ruthenium (Ru) or rhodium (Rh).

18. The method as recited in claim 12 wherein said inner surface is devoid of Ni.

19. The method as recited in claim 12 wherein said perovskite material is selected from the group consisting of SrZr 0.3 Ce 0.7 O 3 , BaZr 0.3 Ce 0.5 Y 0.2 O 3 , and BaZr 0.1 Ce 0.7 Y 0.2 O 3 .

20. The method as recited in claim 19 wherein said perovskite material is SrZr 0.3 Ce 0.7 O 3 .

21. The method as recited in claim 19 wherein said perovskite material is BaZr 0.3 Ce 0.5 Y 0.2 O 3 .

22. The method as recited in claim 19 wherein said perovskite material is BaZr 0.1 Ce 0.7 Y 0.2 O 3 .