公开(公告)号：US4182745A

公开(公告)日：1980-01-08

申请号：US842668

申请日：1977-10-17

申请人： Fusao Nishida ,  Toshihiro Ueno ,  Tomiaki Yamada ,  Noriyuki Suzuki ,  Takehiko Takeda ,  Tsutomu Yanagihara ,  Katsuhiko Adachi ,  Tadashi Asanabe ,  Katsuaki Ohsato ,  Kintaro Tsuda ,  Keiichiro Watanabe

发明人： Fusao Nishida ,  Toshihiro Ueno ,  Tomiaki Yamada ,  Noriyuki Suzuki ,  Takehiko Takeda ,  Tsutomu Yanagihara ,  Katsuhiko Adachi ,  Tadashi Asanabe ,  Katsuaki Ohsato ,  Kintaro Tsuda ,  Keiichiro Watanabe

IPC分类号： B01D53/86 ,  B01J23/85 ,  B01D53/00

CPC分类号： B01J23/85 ,  B01D53/8628 ,  Y10S502/51

摘要： The present invention relates to a catalyst comprising at least a metal salt of heteropoly-acid, which is composed of a sort of heteropoly-acid and one or more metals selected from a group of the first transition metals of the periodic table. The catalyst of the present invention exhibits high activity and selectivity in the catalytic reduction of nitrogen oxides with ammonia at a temperature of from 250.degree. to 550.degree. C. and offers high resistivity to the poisonous effect of sulfur oxides. It does not entail a wasteful use of the reducing agent, because the catalyst of the present invention does not accelerate the reaction of the reducing agent such as ammonia with oxygen coexisting in the waste gas to be treated, which results in the elimination of the undesired excessive consumption of the reducing agent.Therefore, this invented catalyst may provide a commercially advantageous process for removing harmful constituents, nitrogen oxides from a waste gas which contains the same and additionally, in some cases, sulfur dioxides.

摘要翻译： 本发明涉及包含至少一种杂多酸金属盐的催化剂，其由一种杂多酸和一种或多种选自元素周期表的第一过渡金属的金属组成。 本发明的催化剂在250℃至550℃的温度下，氨还原氮氧化物时具有较高的活性和选择性，并且对硫氧化物的有毒作用具有高电阻率。 因为本发明的催化剂不会加速还原剂如氨与在待处理的废气中共存的氧的反应，所以不会浪费使用还原剂，这导致消除不期望的 过量消耗还原剂。 因此，本发明的催化剂可以提供一种商业上有利的方法，用于从含有相同的废气中除去有害成分，氮氧化物，另外在一些情况下可提供二氧化硫。