Catalyst – solid sorbent – or support therefor: product or process – Catalyst or precursor therefor – Metal – metal oxide or metal hydroxide
Reexamination Certificate
2006-07-25
2006-07-25
Johnson, Christina (Department: 1725)
Catalyst, solid sorbent, or support therefor: product or process
Catalyst or precursor therefor
Metal, metal oxide or metal hydroxide
C502S305000, C502S324000, C502S325000, C502S326000, C502S330000, C502S332000, C502S333000, C502S355000, C502S334000, C502S354000, C502S353000, C502S335000, C502S336000, C502S351000, C502S337000, C502S350000, C502S338000, C502S349000, C502S339000, C502S348000, C502S347000
Reexamination Certificate
active
07081433
ABSTRACT:
Gold-titania (Au—TiO2) composite aerogels and ambigles were synthesized, characterized, and tested as ambient temperature catalysts for carbon monoxide. Adding alkanethiolate-monolayers-protected gold clusters (with ˜2 nm Au cores) directly to titania sol before gelation yields uniformly dispersed guests in the composite aerogel. The Au guests aggregate to 5 to 10 nm upon calcination to remove alkanethiolate and crystallize amorphous titania to anatase. The resulting composite aerogel exhibits high catalytic activity toward CO oxidation at room temperature at Au particle sizes that are essentially inactive in prior Au—TiO2catalysts. Transmission electron microscopy illustrates the three-dimensional nature of the catalytic nanoarchitecture in which gold guests contact multiple anatase nanocrystallites.
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Pietron Jeremy
Rolison Debra
Stroud Rhonda
Johnson Christina
Karasek John J.
Ressing Amy L.
The United States of America as represented by the Secretary of
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