Regeneration of sulfur poisoning Cu-Ir/H-ZSM-5catalyst in catalytic reduction of NOx with propane by H2 reduction
PAN Hua1, JIAN Yan-fei1, GUO Yu-hui2, CHEN Ning-na1, HE Chi1
1. Department of Environmental Science and Engineering, Xi'an Jiaotong University, Xi'an 710049, China;
2. Key Lab of Aerosol Chemistry and Physics, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an 710075, China
Effect of regeneration parameters of H2 reduction on sulfur poisoning Cu-Ir/H-ZSM-5catalyst for catalytic reduction of NOx with propane (C3H8-SCR) was investigated. The regeneration behavior was carried out by N2 adsorption, X-ray diffraction (XRD), X-ray photoelectron spectrometer (XPS) and hydrogen temperature-programmed reduction (H2-TPR). Deactivation of Cu-Ir/H-ZSM-5was caused by the formation of CuSO4, resulting in the loss of the active sites, decrease of the surface area, microspore area and pore volume of catalyst. The temperature of 500℃ and regeneration gas consumption of 42.8L/gcatalyst were the best regeneration condition for H2 reduction, because of the lowest content (0.4%) of CuSO4 on Cu-Ir/H-ZSM-5catalyst. The activity of Cu-Ir/H-ZSM-5catalyst regenerated could be returned to 95% of the fresh catalyst. The increase of the surface area, microspore area, and pore volume of catalyst was obtained by H2 reduction.
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