Solution-based approach to make porous coatings for sinter-resistant catalysts

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;
• and
• a crystalline coating of metal oxide nanoparticles selectively disposed on the metal oxide support distributed around the platinum group metal catalyst, wherein 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.

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;
• and
• a crystalline coating of metal oxide nanoparticles that comprise aluminum oxide (Al2O3) selectively disposed on the metal oxide support comprising aluminum oxide (Al2O3), 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.