氢部分选择性催化还原NO反应研究  

AN INVESTIGATION OF PARTIAL-SELECTIVE CATALYTIC REDUCTION OF NO BY HYDROGEN

作　　者：孟赫[1] 王树东[1] 付桂芝[1] 吴迪镛[1] 

机构地区：[1]中国科学院大连化学物理研究所,辽宁大连116023

出　　处：《燃料化学学报》2002年第4期332-335,共4页Journal of Fuel Chemistry and Technology

摘　　要：在低钯含量活性非均布Pd Al2 O3 催化剂上 ,实现了富氧条件下 ,氢部分选择性催化还原NO过程 ,低温、富氧条件下NO的转化率高达 80 %～ 1 0 0 %。NO直接分解实验表明 ,60 0℃ ,NO分解转化率在无氧时为 1 7 3 % ,有0 5 %氧存在时接近于 0。氢非选择性还原NO条件下 ,1 0 0℃以上 ,NO转化率为 1 0 0 %。根据实验结果及文献 ,推测了氢部分选择性还原NO过程中可能存在的反应 ,不同的反应温度下 ,NO脱除反应有所不同。在 1 1 5℃以下 ,NO还原产物为NH3 ;1 1 5℃～ 1 55℃ ,NO还原产物为NH3 、N2 O和N2 ;1 55℃以上 ,NO还原产物中无NH3 存在。NO还原反应与氢氧反应是平行的竞争反应。Partial selective catalytic reduction of NO by hydrogen has been studied on non uniform activity distribution Pd/Al 2O 3 catalyst with low Pd content in the excess of oxygen Experimental results show that conversion of NO can be up to 80%～100% at low temperatures under excessive O 2 condition NO decomposition experiment and non selective catalytic reduction of NO by hydrogen have also been studied Decomposition conversion of NO can be reached 17 3% in the absence of O 2 and close to 0 with 0 5% O 2 at 600?℃ Conversion of NO was 100% at temperatures higher than 100?℃ under rich hydrogen condition In according to the results of experiments and relevant references, possible reactions were speculated in the process of P SCR of NO The reaction of reducing NO shows different mechanisms at different temperatures NO is reduced to NH 3 at temperatures of 115?℃ below, to a mixture of NH 3, N 2O and N 2 at temperatures ranging from 115?℃ to 155?℃, respectively However, no NH 3 was found at temperatures higher than 155?℃ The NO reduction reaction and H 2 O 2 reaction are parallel reactions

关 键 词：NO 活性非均布催化剂 部分选择性催化还原 氢 一氧化氮 废气处理 

分 类 号：X701[环境科学与工程—环境工程] O643.32[理学—物理化学]