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采用浸渍法制备了一系列不同含量Ce改性的HZSM-5分子筛催化剂,考察它们在催化分解甲硫醇反应中的催化活性.通过XRD、BET、H2-TPR、NH3-TPD和CO2-TPD等手段对其物化性能进行表征,并讨论反应温度对不同Ce含量的HZSM-5分子筛催化活性的影响.结果表明:当Ce的含量为1%时,CeO_2高度分散在HZSM-5分子筛上;当Ce含量增加时,生成结晶态的CeO_2,且随Ce含量的增加,结晶态的CeO_2越多,所以含量较高的Ce改性HZSM-5分子筛存在明显的还原性能,能够促进甲硫醇的催化分解;稀土Ce的引入还能够调控HZSM-5分子筛的酸碱性,而表面酸碱量的变化同时也影响了HZSM-5分子筛催化分解甲硫醇的活性.
A series of Ce-modified HZSM-5 molecular sieve catalysts with different Ce contents were prepared by impregnation method, and their catalytic activities in the catalytic decomposition of methyl mercaptan were investigated. XRD, BET, H2-TPR, NH3-TPD and CO2- , And the influence of reaction temperature on the catalytic activity of HZSM-5 zeolite with different Ce contents was discussed.The results showed that CeO_2 was highly dispersed on HZSM-5 zeolite when Ce content was 1% As the content of CeO 2 increases, crystalline CeO 2 is formed. With the increase of Ce content, the more crystalline CeO 2, the higher the content of Ce modified HZSM-5 zeolite has obvious reduction performance, which can promote the catalytic decomposition of methanethiol ; The introduction of rare earth Ce also can regulate the acid-base HZSM-5 zeolite, while the surface acid-base changes also affect the HZSM-5 zeolite catalytic decomposition of methyl mercaptan activity.