| 摘要 |
1,055,307. Bismuth and tellurium salts of heteropoly acids. SOCIETA EDISON. Sept. 18, 1963 [Sept. 20, 1962], No. 36798/63. Heading C1A. [Also in Divisions B1 and C2] A heteropoly compound is prepared by reacting at least one heteropoly acid having as a central element Ti, Zr, Sn, Mn, Co, Ni, Cr, Al or Fe and having molybdenum as its coordinated element, or an ammonium salt of such an acid with a salt, oxide or hydroxide of Bi or Te. The reaction is performed in a liquid reaction medium in the presence of a strong acid, and the products have the formul t e: Me a -BMo c O z , where Me is Bi or Te, B is Mn, Co, or Ni, x is a number from 0-1 to 18 and z is a number from 29 to 65; Me x AMo 12 O y , where Me is Bi or Te, A is Ti, Zr, or Sn, x is a number from O'l to 18, and y is a number from 38 to 74; and Mea-tCgMo ia O w ], where Me and are as above, C is Cr, Al or Fe, and w is number from 39 to 75. The above compounds are prepared from the corresponding acids H 4 (AMo 12 O 40 ); H 6 (BMo 9 O 32 ); and H 6 (C 2 Mo 12 O 42 ). The above materials are used as catalysts in the preparation of organic nitriles, preferably unsaturated nitriles, from defines, e.g. propylene by the action of ammonia and oxygen. The catalytic material may be activated before use by heat treatment at a temperature between 400‹ and 600‹ C. for a period of time from 5 to 30 hours. Prior to the heat treatment there may be added to the catalyst an organic substance, e.g. oil, glycerol, polyvinyl acetate, and polyvinyl alcohol, which substance decomposes on heating to increase the porosity of the catalyst. A support material, e.g. silica aerogel, may be mixed with the catalyst. In the nitrile producing reaction which is carried out at a temperature of 300‹ to 600‹ C., the contact time of the gaseous reactants on the catalyst is between 0-05 and 20 sees., and the proportions of reaetants are such that the mixture contains between 0À5 and 2-5 moles of oxygen and between 0-3 and 2 moles of ammonia per mole of olefin. The reacting gases may be diluted with an inert gas, e.g. a paraffinic hydrocarbon, N 2 , CO 2 , or steam. |
