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负载过渡金属的ZSM-5催化剂用于催化甲硫醚(DMS)转化成甲硫醇(MT)的反应.实验结果表明,催化剂的甲硫醚转化率提高和甲硫醇选择性降低的趋势一样,都是以下顺序:Co/ZSM-5>Mo/ZSM-5>Ni/ZSM-5>W/ZSM-5.表征结果表明,由于过渡金属阳离子(W6+、Ni2+、Co3+、Mo6+)比Al3+活泼,而改性过程中W6+、Ni2+、Co3+、Mo6+分别代替了部分Al3+,使得改性催化剂对DMS和MT的化学吸附作用更强.过渡金属的引入使得ZSM-5总酸度增强,提高了C―S键的裂解能力,从而改进了催化转化DMS的能力.研究结果发现,在转化DMS的过程中,金属活性位和酸性位之间通过强的协同效应起作用.
The transition metal-supported ZSM-5 catalyst was used to catalyze the conversion of dimethylsulfide (DMS) to methanethiol (MT) .The experimental results show that the catalyst has the same trend of increasing the conversion of methyl sulfide as the selectivity of methylmercaptan , All in the following order: Co / ZSM-5> Mo / ZSM-5> Ni / ZSM-5> W / ZSM-5. The characterization results show that due to the transition metal cation (W6 +, Ni2 +, Co3 +, Mo6 + , While some Al3 + were replaced by W6 +, Ni2 +, Co3 + and Mo6 + respectively during the modification process, which made the modified catalysts have a stronger chemisorption on DMS and MT.The introduction of transition metal increased the total acidity of ZSM-5, S bond cleavage ability, thus improving the ability to catalyze the conversion of DMS.The results show that in the process of converting DMS, the metal active site and acidic sites through a strong synergistic effect.