| 摘要 |
This invention relates to a catalyst and a method for producing said catalyst. At least 60 percent by weight of the catalyst consists of copper oxide, aluminum oxide-spinel and 60-100 percent of the copper present is bound to aluminum oxide as copper oxide, aluminum oxide-spinel, where the molar ratio Cu:Al=0.25-0.50. The catalyst itself contains 1-20 percent by weight of zinc oxide which is present in the pores of the spinel. Further amounts of zinc oxide may be admixed mechanically or be present as a coating on the catalyst tablets. The catalyst is especially well suited for conversion of carbon monoxide with steam to hydrogen. The catalyst is produced by precipitation of copper- and aluminum salts at pH=6.0-6.5 during addition of an ammonium carbonate solution. After filtration and drying, the product is calcined at 750 DEG -850 DEG C. until there is obtained a product having a 60-100 percent spinel structure. Zinc salt is introduced in the pores of the spinel, and the product thereby formed is heated up to at least the decomposition temperature for the zinc salt which is then converted to zinc oxide. Possible addition of zinc oxide in addition to that introduced into the pores of the spinel may be admixed mechanically. |
