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Yoshichika Umemoto, Toshio Nakatani, Kimio Ohuchi: Cerium- and zirconium-based mixed oxide, method of producing same and catalyst material for exhaust gas purification. Daiichi Kigenso Kagaku Kogyo, Sughrue Mion Zinn Macpeak & Seas PLLC, November 21, 2000: US06150299 (24 worldwide citation)

Mixed oxides excellent in thermal stability of specific surface area and in oxidation-reduction performance are provided on an industrial scale. Catalyst materials useful in exhaust gas purification are also provided. The invention is concerned with mixed oxides containing cerium, zirconium and sulf ...


2
Yoshichika Umemoto, Toshio Nakatani, Kimio Ouchi: Zirconium- and cerium-based mixed oxide and method of production thereof. Daiichi Kigenso Kagaku Kogyo, Baker Botts L, July 3, 2001: US06255242 (21 worldwide citation)

A zirconium- and cerium-based mixed oxide having good thermal stability and oxidation-reduction performance, in particular, is provided. The mixed oxide which comprises zirconium and cerium is characterized in (1) that cubic phase purity of a zirconia- and ceria-based solid solution is not less than ...


3
Akira Kohara, Yoshiro Hirasawa, Katsuaki Katoh: Catalyst system to be used in automobile exhaust gas purification apparatus, exhaust gas purification apparatus using the same and exhaust gas purification method. Daiichi Kigenso Kagaku Kogyo, N E Chemcat Corporation, Edwards Wildman Palmer, James E Armstrong IV, Junko Harada, June 19, 2012: US08202819 (17 worldwide citation)

A catalyst system to be used in an automobile exhaust gas purification apparatus which exerts excellent purification capability to a nitrogen oxide, even when hydrocarbon concentration varies, by subjecting exhaust gas discharged from an automotive internal engine to contacting with a catalyst, an e ...


4
Hiroshi Okamoto: Zirconia-based mixed oxide and production process thereof. Daiichi Kigenso Kagaku Kogyo, Westerman Hattori Daniels & Adrian, August 24, 2010: US07781365 (16 worldwide citation)

The present invention provides a zirconia-based mixed oxide which, together with improving the heat resistance of specific surface area at a high temperature (1000° C. for 3 hours), has a ceria reduction rate of 80% or more, or in other words, improves the heat resistance of specific surface area an ...


5
Akira Kohara, Yoshiro Hirasawa, Takashi Yamada: Exhaust gas purification catalyst, exhaust gas purification apparatus using the same and exhaust gas purification method. Daiichi Kigenso Kagaku Kogyo, N E Chemcat Corporation, Westerman Hattori Daniels & Adrian, December 25, 2012: US08337791 (12 worldwide citation)

An exhaust gas purification catalyst, which is suitable as a three way catalyst for efficiently purifying carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) in exhaust gas discharged from a gasoline automobile and exhaust gas purification apparatus using the same and an exhaust gas p ...


6
Kathuhiko Ito, Hiroshi Sugii, Yukito Takata, Kyoichiro Kokubu: Methods for preparing amorphous zirconium phosphosilicate. Daiichi Kigenso Kagaku Kogyo, Armstrong Nikaido Marmelstein & Kubovick, July 2, 1985: US04526765 (10 worldwide citation)

The present invention provides novel amorphous phosphosilicates represented by the formulae Zr(PO.sub.4).sub.2y (SiO.sub.2).sub.z.n'H.sub.2 O (I) and M.sub.2/l Zr(PO.sub.4).sub.2y (SiO.sub.2).n'H.sub.2 O (III) and the processes for producing the same.


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Takahiro Wakita, Akira Kohara, Yasuharu Kanno, Hiroaki Omoto: Cerium/zirconium-base composite oxide, method for producing the same, oxygen storage/release component using said cerium-zirconium-base composite oxide, exhaust gas purification catalyst, and exhaust gas purification method using the same. Daiichi Kigenso Kagaku Kogyo, N E Chemcat Corporation, Edwards Angell Palmer & Dodge, January 18, 2011: US07871956 (9 worldwide citation)

This invention relates to a cerium-zirconium-base composite oxide, which is useful, e.g., for the purification of exhaust gas discharged from combustion engines such as internal combustion engines and boilers and can release a high level of oxygen in a low temperature region, a method for producing ...


8
Okamoto Hiroshi: Zirconia porous body and manufacturing method thereof. Daiichi Kigenso Kagaku Kogyo C, February 1, 2006: EP1621251-A1 (9 worldwide citation)

A zirconia porous body with excellent stability of heat resistance is manufactured. This relates to a zirconia porous body having peaks at pore diameters of 8 to 20 nm and 30 to 100 nm in a pore distribution based on the BJH method, with a total pore volume of 0.4 cc/g or more, and to a zirconia por ...


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Okamoto Hiroshi, Kodama Hiroshi: Cerium-zirconium mixed oxide and method for manufacturing the same. Daiichi Kigenso Kagaku Kogyo C, July 4, 2007: EP1803686-A1 (7 worldwide citation)

A cerium-zirconium mixed oxide with improved heat resistance of the specific surface area at a high temperature (1000 DEG C) is provided along with a manufacturing method therefor. This cerium-zirconium mixed oxide comprises of spherical particles 5 to 20 nm in size and rodlike particles 5 to 20 nm ...