Heat resistant transition alumina and process for producing the same
AssigneeSumitomo Chemical Company, Limited
InventorsSeiichi Hamano, Osamu Yamanishi
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Abstract
A heat resistant transition alumina produced by mixing aluminum sulfate and a lanthanum compound, heating the mixture, and then thermally decomposing the mixture, and a process for producing the heat resistant transition alumina. The heat resistant transition alumina has a high BET specific surface area, and an excellent heat resistance as exhibiting a less reduction in the BET specific surface area even under temperatures of 1000.degree. C. or higher, and exhibits a high porosity even when coated onto other catalyst supports having a lower specific surface area, and is producibile at a lower cost.
Claims14
A heat resistant transition alumina produced by mixing aluminum sulfate and a lanthanum compound, heating the mixture, and then thermally decomposing the mixture,
- the heat resistant transition alumina having a porosity of about 0.6 cc/g to about 2.0 cc/g and a heat resistance, measured as a BET specific surface area after heat-treatment at 1200.degree. C. for 3 hours, of about 50 m.sup.2 /g or more.
A process for producing a heat resistant transition alumina comprising mixing aluminum sulfate and a lanthanum compound to obtain a mixture containing water in an amount corresponding to a higher hydration than a hexahydrated salt measured as water of hydration of aluminum sulfate, heating the mixture to about 100.degree. C. or higher but lower than the decomposition temperature of aluminum sulfate until the mixture contains water in an amount corresponding to a hexa- or lower hydrated salt measured as water of hydration of aluminum sulfate, and then thermally decomposing the mixture containing water in an amount corresponding to a hexa- or lower hydrated salt at about 900.degree. C. to about 1,500.degree. C.
Dependencies are inferred from the claim text.