Catalyst/catalyst support compositions having high reducibility and comprising a nanometric cerium oxide deposited onto a support substrate
AssigneeRhodia Operations
InventorsFranck Fajardie, Stephan Verdier
Life of this patent
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Abstract
Catalyst/catalyst support compositions are characterized by a supported cerium oxide, deposited onto a silica, alumina, titanium or zirconium based support, including particles of said supported oxide deposited onto said support, individualized or in the form of aggregates, no greater than 500 nm in size and having, after 6 hours of calcination at a temperature of at least 800° C., a measured reducibility from 30° C. and 900° C. of at least 80%; such compositions are prepared by combining a colloidal dispersion of the supported oxide and a suspension of the support, drying the resulting mixture by atomization and drying the resulting product by calcination.
Claims24
A catalyst/catalyst support composition in a powder form consisting essentially of:
- ceric oxide CeO2;
- and
- a support composed of silica, alumina, titanium oxide, zirconium oxide, or any combination thereof, the ceric oxide being deposited onto the support and being in the form of particles having a size of at most 50 nm, which are separate or in the form of aggregates,
- wherein the composition exhibits, after calcination at a temperature of at least 800° C. for 6 hours, a reducibility measured from 30° C. to 900° C. of at least 80%.
A catalyst/catalyst support composition in a powder form consisting essentially of:
- ceric oxide CeO2;
- and
- an alumina-based support made of alumina only or alumina stabilized by at least one element chosen from rare earth metals, silicon and zirconium,
- ceric oxide being deposited onto the alumina-based support and being in the form of particles having a size of at most 50 nm, which are separate or in the form of aggregates,
- wherein the composition exhibits, after calcination at a temperature of at least 800° C. for 6 hours, a reducibility measured from 30° C. to 900° C. of at least 80%, the alumina support of which additionally being devoid of the elements barium and strontium.
Dependencies are inferred from the claim text.