SOLUTION-BASED APPROACH TO MAKE POROUS COATINGS FOR SINTER-RESISTANT CATALYSTS
First Claim
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1. A catalyst system comprising:
- a platinum group metal catalyst bound to a metal oxide support; and
a crystalline coating of metal oxide nanoparticles selectively disposed on the metal oxide support, 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.
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Abstract
Catalyst systems that are resistant to high-temperature sintering and methods for preparing such catalyst systems that are resistant to sintering at high temperatures are provided. Methods of forming such catalyst systems include contacting a support having a surface including a catalyst particle with a solution comprising a metal salt and having an acidic pH. The metal salt is precipitated onto the surface of the support. Next, the metal salt is calcined to selectively generate a porous coating of metal oxide on the surface of the support distributed around the catalyst particle.
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Citations
19 Claims
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1. A catalyst system comprising:
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a platinum group metal catalyst bound to a metal oxide support; and a crystalline coating of metal oxide nanoparticles selectively disposed on the metal oxide support, 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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A catalyst system comprising:
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a platinum group metal catalyst selected from the group consisting of;
palladium, platinum, and combinations thereof bound to a metal oxide support; anda 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. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A catalyst system comprising:
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a platinum group metal catalyst selected from the group consisting of;
palladium, platinum, and combinations thereof bound to a metal oxide support; anda 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. - View Dependent Claims (18, 19)
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Specification