Patent ID: 11951465
Assignee: GM GLOBAL TECHNOLOGY OPERATIONS LLC
Field: Chemical engineering (Chemistry)
Classification: CPC B | IPC B

Claim 12:
13. A catalyst system comprising:
a platinum group metal catalyst selected from the group consisting of: palladium, platinum, and combinations thereof bound to a metal oxide support comprising aluminum oxide (Al2O3) and defined by a plurality of particles having, an average diameter greater than or equal to about 0.8 micrometers to less than or equal to about 5 micrometers, and a surface area of the metal oxide support being greater than or equal to about 50 m2/g to less than or equal to about 150 m2/g; and
a crystalline coating of metal oxide nanoparticles that comprise aluminum oxide (Al2O3) disposed on the metal oxide support around the platinum group metal catalyst, wherein the metal oxide nanoparticles have an average maximum diameter of greater than or equal to about 0.5 nm to less than or equal to about 50 nm, and the crystalline coating has a porosity of greater than about 20% to less than about 70% and covers greater than or equal to about 1.5% to less than or equal to about 80% of an exposed surface area of the metal oxide support.