| 摘要 |
FIELD: oxidation catalysts. SUBSTANCE: catalyst contains manganese compounds and aluminum oxide, and active catalyst component contains from 40 to 100 wt % (on elementary manganese basis) of tetragonal alpha-Mn<SB>3</SB>O<SB>4</SB> and tetragonal gamma-Mn<SB>2</SB>O<SB>3</SB> at gamma-Mn<SB>2</SB>O<SB>3</SB>/alpha-Mn<SB>2</SB>O<SB>4</SB> ratio 1-2. On the whole, catalyst is composed of 4.8-8.5 wt % of manganese compounds (on elementary manganese basis), 1.9-8.5 wt % of gamma-Mn<SB>2</SB>O<SB>3</SB> and alpha-Mn<SB>3</SB>O<SB>4</SB>, and alumina to 100%. Catalyst is prepared as follows: catalyst charge is formed on the basis of aluminum hydroxide and manganese(IV) oxide and also includes 20 to 70% alumina and/or alumino-manganese oxide filler with particle size of more than 80% of it below 63 mcm. Charge is plasticized by nitric acid in quantity from 2 to 7%, then molded, dried, and calcined at 930-970 C in an oxidative medium. EFFECT: achieved high strength and activity at high temperatures and reduced manganese oxide content. 9 cl, 1 dwg, 1 tbl, 14 exr
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