论文部分内容阅读
研制出一种强酸促进的甲烷非氧化脱氢芳构化催化剂Ｍｏ－Ａ／ＨＺＳＭ－５．在可比的实验条件下，其对甲烷的转化活性和苯收率比非促进的Ｍｏ／ＨＺＳＭ－５催化剂均提高约４０％，且催化剂稳定性大为提高．实验结果揭示表面酸度，主要是表面Ｂ－酸位浓度，与甲烷的转化活性密切相关．本文认为在强酸促进的Ｍｏ－Ａ／ＨＺＳＭ－５催化剂上，甲烷活化脱氢主要系经由Ｂ－酸助的Ｃ－Ｈ键异裂的反应途径，即：低价Ｍｏ物种则可能在稳定卡宾中间态，以及后续的齐聚、芳构化过程中起重要作用．
A strong acid promoted methane non-oxidative dehydroaromatization catalyst Mo-A / HZSM-5 was developed. Under comparable experimental conditions, the conversion of methane to benzene and the yield of benzene increased by about 40% compared with non-promoted Mo / HZSM-5 catalyst, and the catalyst stability was greatly improved. The experimental results reveal that the surface acidity, mainly the surface B-acid concentration, is closely related to the methane conversion activity. In this paper, it is suggested that the activated dehydrogenation of methane is mainly through the reaction pathway of the C-H bond assisted by the B-acid on the strongly acid promoted Mo-A / HZSM-5 catalyst, ie, the low Mo species may be in the middle of the stable carbene State, and subsequent gathering, aromatization process plays an important role.