Selective Catalytic Realaction of Nitric Oxide with Hydrocarbons in Oxygen-rich Atmosphere

富氧气氛中一氧化氮与碳氢化合物的选择性催化反应

• 批准号: 04453083
• 负责人: KIKUCHI Eiichi
• 金额: $ 5.06万
• 依托单位: Waseda University.
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04453083/
• 关键词: Nitric oxide; Nitrogen dioxide; Selective reduction; Zeolite; Gallium; Iudium; Methane; Reaction mechanism; 炭化水素; エタン; プロパン

Selective reduction of No by CH_4 on zeolite catalysts has been studied. After investigation on the catalytic features of various cation-exchaged zeolites, we found that Ga-ZSM-5 and In-ZSM-5 were highly active and selective for NO reduction by CH_4. We also showed that this reaction was moderately promoted even by H-form ZSM-5, mordenite, and ferrierite. From the catalytic performance of Ga-and In-ZSM-5in NO-CH_4-O_2, NO_2-CH_4-O_2, and NO-O_2 reactions, it is conuluded that the selective reduction of NO on these catalysts proceeds in two stages : (1) NO is oxidized to NO_2 on zeolite acid sites, (2) NO_2 and CH_4 react on gallium or indium sites. The highly selective features of Ga and In in zeolite for NO_2-CH_4 reaction seem to be attributed to the coordinatively unsaturated nature of these sites which adsorb both of these reactants on the same site. Effect of water vapor on NO conversion was also investigated. It was found that Ga-ZSM-5 was strongly inhibited by steam, while In-ZSM-5 was fairly active even in the presence of 10% steam.

研究了在沸石催化剂上甲烷选择性还原NO的反应。考察了不同阳离子交换沸石的催化性能，发现Ga-ZSM-5和In-ZSM-5对CH_4还原NO具有高活性和高选择性。我们还表明，这种反应是适度促进，甚至由H-型ZSM-5，丝光沸石，镁碱沸石。从Ga-ZSM-5和In-ZSM-5对NO-CH_4-O_2、NO_2-CH_4-O_2和NO-O_2反应的催化性能来看，NO在这些催化剂上的选择性还原反应是分两个阶段进行的：（1）NO在沸石酸中心上氧化为NO_2;（2）NO_2和CH_4在镓或铟中心上反应。Ga和In在分子筛中对NO_2-CH_4反应的高选择性是由于Ga和In的配位不饱和性质，使它们吸附在同一位置上。研究了水蒸气对NO转化率的影响。结果表明，Ga-ZSM-5分子筛在水蒸气存在下具有很强的阻化作用，而In-ZSM-5分子筛在10%水蒸气存在下仍具有一定的活性。

项目成果

Katsunori YOGO: "Selective Reduction of Nitric Oxide by Methan on Zeolite Catalysts" Shokubai(Catalyst). 35(2). 126-129 (1993)

Katsunori YOGO：“甲烷在沸石催化剂上选择性还原一氧化氮”触媒（触媒）。

Katsunori YOGO: "Selective Reduction of NO with Propane on Gallium Ion-exchanged Zeolites" Chemistry Letters. 1025-1028 (1992)

Katsunori YOGO：“在镓离子交换沸石上用丙烷选择性还原 NO”化学快报。

Katsunori Yogo: "Selective Reduction of Nitrogen Monoxide with Methane or Ethane on Gallium Ion-exchanged ZSM-5 in Oxgen rich Atmosphere" Chemistry Letters. 229-232 (1992)

Katsunori Yogo：“在富氧气氛中用镓离子交换 ZSM-5 选择性还原甲烷或乙烷”化学快报。

Katsunori YOGO: "Reaction Mechanism of Selective Reduction of Nitric Oxide by Methane on Ga- and In-ZSM-5 Catalysts" Proceedings from the Tenth International Zeolite Conference. (in press). (1994)

Katsunori YOGO：“Ga-和In-ZSM-5催化剂上甲烷选择性还原一氧化氮的反应机制”第十届国际沸石会议论文集。

Katsunori YOGO: "Mechanism of Selective Catalytic Reduction of Nitric Oxide on Fe-Silicate in Oxygen-rich Atmosphere" ACS Symposium Series. (in press). (1994)

Katsunori YOGO：“富氧气氛中铁硅酸盐上一氧化氮的选择性催化还原机制”ACS 研讨会系列。