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AssigneeHitachi, Ltd.
InventorsHisao Yamashita, Akira Kato, Shigeo Uno, Mamoru Mizumoto, Shinpei Matsuda
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The disclosure is concerned with a high temperature stable catalyst comprising an alumina base support and a catalytically active component supported on the support. The support is featured by its specific composite oxide having a specific surface area of at least 10 m.sup.2 /g and a structural form of amorphous state or a phase resemble to lanthanoide .beta.-alumina. The composite oxide can be converted to lanthanoide .beta.-alumina when heated to an elevated temperature above 1000.degree. C. within 2 hours. The composite oxide is substantially free from such ingredients as accelerate grain growth of alumina. The ingredients are for example Cr, Sr or Ce. The present disclosure is also concerned with a process for preparing the catalyst and a process for conducting chemical reactions such as steam reforming, desulfurization of heavy oil, cracking of hydrocarbons, etc. using the catalyst.
A high temperature stable catalyst, which comprises a support and a catalytically active component supported thereon, wherein at least part of said support consists essentially of a composite oxide of aluminum and at least one member selected from the group consisting of lanthanum, neodymium, praseodymium and mixtures thereof, said composite oxide having a specific surface area of at least 10 m.sup.2 /g, and said composite oxide being characterized in that it exhibits characteristic peaks of lanthanide-beta-alumina in X-ray diffraction analysis, and wherein said composite oxide is a calcination product of a mixture of an aluminum compound and a member selected from the group consisting of lanthanum compound, neodymium compound, praseodymium compound and mixtures thereof, calcined at of at least 800.degree. C. for a time sufficient to convert the mixture into said composite oxide.
A high temperature stable catalyst, which comprises a support and a catalytically active component supported on said support, wherein at least part of said support consists essentially of composite oxide of aluminum and at least one member selected from the group consisting of lanthanum, neodymium, praseodymium and mixtures thereof and has a specific surface area of at least 10 m.sup.2 /g, said composite oxide being characterized in that it exhibits characteristic peaks corresponding to those of lanthanide-beta-alumina in X-ray diffraction analysis, and said composite oxide containing less than 1% weight of chromium, strontium and cerium.
A high temperature stable catalyst, which comprises a support and a catalystially active component supported on said support, wherein at least part of said support consists essentially of a composite oxide of aluminum, in an amount of 99 to 80 molar %, and at least one member, in an amount of 1 to 20 molar %, selected from the group consisting of lanthanum, neodymium, praseodymium, and mixtures thereof;
A high temperature stable catalyst, which comprises a support and a catalytically active component supported on said support, wherein at least part of said support consists essentially of a composite oxide of aluminum, in an amount of 99 to 80 molar %, and at least one member, in an amount of 1 to 20 molar %, selected from the group consisting of lanthanum, neodymium, praseodymium and mixtures thereof;
A process for preparing a high temperature stable catalyst, which comprises the steps of:
A high temperature stable catalyst, which comprises a support and a catalytically active component supported on said support, wherein at least part of said support which supports said active components consists essentially of a composite oxide of aluminum and at least one member selected from the group consisting of lanthanum, neodymium, praseodymium and mixtures thereof and has a specific surface area of at least 10 m.sup.2 /g, said composite oxide being chracterized in that it exhibits characteristic peaks corresponding to those of lanthanide-beta-alumina in the X-ray diffraction analysis.
A high temperature stable catalyst, which comprises a support and a catalytically active component supported on said support, wherein said support consists essentially of a composite oxide of aluminum and at least one member selected from the group consisting of lanthanum, neodymium, praseodymium, and mixtures thereof and has a specific surface area of at least 10 m.sup.2 /g, said composite oxide being characterized in that it exhibits characteristic peaks corresponding to those of lanthanide-beta-alumina in the X-ray diffraction analysis.
A high temperature stable catalyst, which comprises a support and a catalytically active component supported on said support, wherein said support has a coating thereon which consists essentially of a composite oxide of aluminum and at least one member selected from the group consisting of lanthanum, neodymium, praseodymium and mixtures thereof and has a specific surface area of at least 10 m.sup.2 /g, said composite oxide being characterized in that it exhibits characteristic peaks corresponding to those of lanthanide-beta-alumina in the X-ray diffraction analysis.
Dependencies are inferred from the claim text.