Pacific Industrial Development Corporation

Jin Cho

Yunkui Li

David Shepard

Anatoly Bortun

Mila Bortun

Wei Wu

Jeffery Lachapelle

A nanocrystal-sized cerium-zirconium-aluminum mixed oxide material includes at least 20% by mass zirconium oxide; between 5% to 55% by mass cerium oxide; between 5% to 60% by mass aluminum oxide; and a total of 25% or less by mass of at least one oxide of a rare earth metal selected from the group of lanthanum, neodymium, praseodymium, or yttrium. The nanocrystal-sized cerium-zirconium-aluminum mixed oxide exhibits hierarchically ordered aggregates having a dso particle size less than 1.5 μm, and retains at least 80% of surface area and pore volume after ageing at temperature higher than 1000° C. for at least 6 hours. The nanocrystal-sized cerium-zirconium-aluminum mixed oxide material is prepared using a co-precipitation method followed by milling the dried and calcined oxide material. The nanocrystal-sized cerium-zirconium-aluminum mixed oxide material forms a particulate filter that may be used in an exhaust system arising from a gas or diesel engine.

Nanocrystal-sized cerium-zirconium-aluminum oxide material and method of making the same

A nanocrystal-sized cerium-zirconium mixed oxide material includes at least 30% by mass zirconium oxide; between 5% to 55% by mass cerium oxide; and a total of 25% or less by mass of at least one oxide of a rare earth metal selected from the group of lanthanum, neodymium, praseodymium, or yttrium. The nanocrystal-sized cerium-zirconium mixed oxide exhibits hierarchically ordered aggregates having a dparticle size less than 1.5 μm and a total pore volume after calcination at a temperature of 600° C. or more that is at least 0.7 cm/g with a fraction of pores between 2 nm to 10 nm being less than 15%. The nanocrystal-sized cerium-zirconium mixed oxide material is prepared using a co-precipitation method followed by milling the dried and calcined oxide material. The nanocrystal-sized cerium-zirconium mixed oxide material forms a particulate filter that may be used in an exhaust system arising from a gas or diesel engine.

Nanocrystal-sized cerium-zirconium oxide material and method of making the same

A method of making an oxygen storage material (OSM) with developed mesoporosity having a small fraction of pores &#x3c;10 nm (fresh or aged), and resistance to thermal sintering is provided. This OSM is suitable for use as a catalyst and catalyst support. The method of making this oxygen storage material (OSM) includes the preparation of a solution containing pre-polymerized zirconium oligomers, cerium, rare earth and transition metal salts; the interaction of this solution with a complexing agent that has an affinity towards zirconium; the formation of a zirconium-based precursor; and the co-precipitation of all constituent metal hydroxide with abase.

Method of making mesoporous oxygen storage materials for exhaust gas treatment; said oxygen storage materials and their use

An oxygen storage material (OSM) that exhibits enhanced redox properties, developed mesoporosity, and a resistance to sintering. The oxygen storage material (OSM) has a high oxygen storage capacity (i.e., OSC&#x3e;1.5 mmol H/g) and enhanced reducibility (i.e., bimodal TPR-Hprofile with two Tin the temperature range from 150&#xb0; C. to 550&#xb0; C.). The OSM is suitable for use as a catalyst and a catalyst support. The method of making the oxygen storage material comprises the preparation of a solution containing zirconium, cerium, rare earth and transition metal salts, followed by the co-precipitation of all constituent metal hydroxides with a base.

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Utsunomiya, Japan

Jin Cho