Rhodia Operations

Francis Francis

Olivier Larcher

Thomas English

Fabien Ocampo

Andrew D Polli

Qiang Zhao

Barry W L Southward

Simon Ifrah

Naotaka Ohtake

Simon Infrah

Rui Miguel Jorge Coelho Marques

Andrew Polli

Barry WL Southward

The present teachings are directed to inorganic oxide materials that include AlO, CeO, and at least one of MgO and PrO. The present teachings are also directed to catalysts having at least one noble metal supported on these inorganic oxide materials, as well as methods for treating exhaust gases from internal combustion engines using such catalysts.

Inorganic oxide material

Described herein are methods for forming inorganic composite oxides. Such methods include combining, at a substantially constant pH of between about 5 and about 6.75 over a period of at least about 5 minutes, an acidic precursor composition and a basic composition to form a precipitate composition, wherein the acidic precursor composition comprises an alumina precursor, a ceria precursor, a zirconia precursor and optionally one or more dopant precursors; stabilizing the precipitate by increasing the pH of the precipitate composition to between about 8 and about 10; and calcining the stabilized precipitate to form an inorganic composite oxide. Also described are inorganic composite oxides formed using such methods.

Inorganic composite oxides and methods of making the same

The present invention is directed to a high surface area, high pore volume porous alumina, comprising: aluminum oxide, optionally, silicon oxide and aluminosilicates, and optionally one or more dopants, said alumina having a specific surface area of from about 100 to about 500 square meters per gram and a total pore volume after calcination at 900&#xb0; C. for 2 hours of greater than or equal to 1.2 cubic centimeters per gram, wherein less than or equal to 15% of the total pore volume is contributed by pores having a diameter of less than 10 nm.

Alumina catalyst support

A porous inorganic composite oxide containing oxides of aluminum and of cerium and/or zirconium, and, optionally, oxides of one or more dopants selected from transition metals, rare earths, and mixtures thereof, and having a specific surface area, in m/g, after calcining at 1100&#xb0; C. for 5 hours, of &#x2267;0.8235[Al]+11.157 and a total pore volume, in cm/g, after calcining at 900&#xb0; C. for 2 hours, of &#x2267;0.0097[Al]+0.0647, wherein [Al] is the amount of oxides of aluminum, expressed as pbw AlOper 100 pbw of the composite oxide; a catalyst containing one or more noble metals dispersed on the porous inorganic composite oxide; and a method for making the porous inorganic composite oxide.

Porous inorganic composite oxide

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Columbia, MD, United States of America

Francis Francis