Cu-ZSM-11 catalysts prepared with microwave irradiation ion-exchange method and direct decomposition of NO over MeOx/Cu-ZSM-11 with microwave irradiation

doi:10.11949/j.issn.0438-1157.20160697

Abstract

Abstract:

Cu-ZSM-11 molecular sieve was prepared by the microwave ion-exchange method. The heating behavior of several kinds of metal oxides under microwave irradiation was investigated. Some metal oxide(MnO₂ >CuO >Ni₂O₃)which is of good absorption property for microwave was selected to be used for mixing with Cu-ZSM-11 catalyst to prepare the microwave catalysts. Direct decomposition of NO over the microwave catalyst MeO_x/Cu-ZSM-11 was conducted with microwave irradiation, and their performance was investigated under microwave irradiation and traditional heating modes respectively. The results show that the conversion rate of decomposing NO is significantly higher under microwave irradiation than under traditional heating; and at catalyst bed temperature 350℃, the NO conversion is achieved up to 99.30% and N₂ selectivity 99.9%. Furthermore, under microwave irradiation, the conversion of decomposing NO is higher for the mixture catalyst MeO_x/Cu-ZSM-11 than for alone metal oxides and alone Cu-ZSM-11, indicating that microwave irradiation plays important role in catalytic decomposition of nitrogen oxide. The results indicate also that over MeO_x/Cu-ZSM-11 with microwave irradiation, oxygen concentration in steam has almost no influences on its catalytic activity for NO decomposition, i.e. microwave irradiation can remove oxygen inhibition in decomposition reaction and keep unique selective effect. Similarly, the influence of water vapor in stream is also much less under microwave irradiation. The exit gas temperature is almost not change for Microwave-assisted reaction, and is the same as the reaction temperature 500-600℃ for conventional heating mode reaction.

Key words: microwave, microwave ion-exchange, zeolite, catalyst, catalysis, decomposition NO

摘要：

用微波辐照离子交换法制备了Cu-ZSM-11，制备的Cu-ZSM-11和金属氧化物（MeO_x）机械混合制备了微波催化剂MeO_x/Cu-ZSM-11。考察了MeO_x在微波辐照下的升温行为，筛选出吸波性能好的MeO_x（MnO₂ >CuO >Ni₂O₃）为吸波组分。分别考察了微波辐照下金属氧化物、Cu-ZSM-11和MeO_x/Cu-ZSM-11直接分解NO性能，并与常规加热条件下比较。结果表明：微波辐照显著提高了NO的转化率，微波催化剂Ni₂O₃/Cu-ZSM-11在350℃时，NO转化率达到99.27%，N₂选择性达到99.9%；相同条件下，微波辐照MeO_x/Cu-ZSM-11直接分解NO转化率高于对应金属氧化物或Cu-ZSM-11分解NO的转化率，表明微波具有催化作用。微波辐照下氧气浓度对Ni₂O₃/Cu-ZSM-11直接分解NO性能几乎无影响，微波辐照消除了氧气阻抑作用，表现出微波选择效应。水汽存在对转化率有较小影响。反应进口气体不需要预热，进出口气体温度基本不变。

关键词: 微波, 微波离子交换, 沸石, 催化剂, 催化, 分解NO

CLC Number:

O643.3

LUO Yushang, ZHOU Jicheng, XU Wentao, YOU Zhimin, LONG Wei, JIANG Canghai. Cu-ZSM-11 catalysts prepared with microwave irradiation ion-exchange method and direct decomposition of NO over MeO_x/Cu-ZSM-11 with microwave irradiation[J]. CIESC Journal, 2016, 67(11): 4652-4661.

罗羽裳, 周继承, 徐文涛, 游志敏, 龙伟, 蒋沧海. 微波离子交换法制备Cu-ZSM-11及微波辐照MeO_x/Cu-ZSM-11催化分解NO[J]. 化工学报, 2016, 67(11): 4652-4661.

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