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
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2002年第4期332-335,共4页
Journal of Fuel Chemistry and Technology
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
nitrogen oxide
non uniform activity distribution catalyst
partial selective catalytic reduction
hydrogen
