| 纳米银催化的甲烷选择还原NO反应研究 |
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| 引用本文： | 石川,程谟杰,曲振平,包信和.纳米银催化的甲烷选择还原NO反应研究[J].复旦学报(自然科学版),2002,41(3):269-273,279. |
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| 作者姓名： | 石川 程谟杰 曲振平 包信和 |
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| 作者单位： | 1. 中国科学院,大连化学物理研究所,催化基础国家重点实验室,大连,116023;大连轻工业学院,无机与分析化学教研室,大连,116034
2. 中国科学院,大连化学物理研究所,催化基础国家重点实验室,大连,116023 |
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| 基金项目： | 国家重大科技发展基金资助项目 (“973”计划资助项目 )，国家自然科学基资助项目 (2 0 0 0 30 11) |
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| 摘 要： | 采用浸渍方法制备银担载量为3％－15％的Ag/H-ZSM-5催化剂，考察其在CH4选择还原NO反应中的活性和选择性。结果表明分子筛中3％－5％银的引入对催化剂活性提高较小；在银担载量高于7％的催化剂样品上，NO转化率显著提高，通过XRD、UV－vis和TEM技术对催化剂样品的表征，发现在担载量高于7％的催化剂样品上有聚集的纳米银颗粒的形成，并且银颗粒的大小随银担载量增加而增大。将表征结果与反应数据相结合，说明了分子筛外表面纳米银颗粒的形成，提高了银催化剂在CH4选择还原NO反应中的活性。银催化剂上NO／O2共吸附后的TPD和TPR研究揭示了纳米银颗粒参与选择还原反应的机制。
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| 关 键 词： | 甲烷 NO 纳米银 选择还原反应 氮氧化物 Ag／H－ISM－5催化剂 一氧化氮 催化活性 浸渍法 |
| 文章编号： | 0427-7104(2002)03-0269-05 |
Selective Catalytic Reduction of NO by Methane over Nano-silver Catalysts |
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| SHI Chuan ,CHENG Mo jie ,QU Zhen ping ,BAO Xin he.Selective Catalytic Reduction of NO by Methane over Nano-silver Catalysts[J].Journal of Fudan University(Natural Science),2002,41(3):269-273,279. |
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| Authors: | SHI Chuan CHENG Mo jie QU Zhen ping BAO Xin he |
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| Institution: | SHI Chuan 1,2,CHENG Mo jie 1,QU Zhen ping 1,BAO Xin he 1 |
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| Abstract: | Silver impregnated H ZSM 5 catalysts with various silver loading (3% 15%) were investigated for the selective catalytic reduction (SCR) of NO by methane.The NO reduction activities were greatly increased on the catalysts with silver loading higher than 7% samples.Characterization results by XRD,UV vis and TEM indicated that silver species were incorporated in the zeolite channels on low Ag loading samples,while nano sized silver particles were formed over Ag loading higher than 7% samples.Combined characterization results with activity measurements,it was concluded that the catalytic activities were apparently enhanced by the nano silver particles formed.TPD and TPR studies revealed the catalytic roles of nano silver particles in the SCR reaction. |
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| Keywords: | nano silver selective reduction nitrogen oxides |
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