BiZrO_(x)/ZSM-5催化合成气直接芳构化的研究北大核心CSCD

使用超临界法制备纳米BiZrO_(x)金属氧化物与ZSM-5分子筛复合得到双功能催化剂用于合成气直接芳构化,研究了Bi/Zr比对BiZrO_(x)金属氧化物、BiZrO_(x)/ZSM-5双功能催化剂催化CO加氢反应性能的影响.结果表明,少量Bi掺杂在ZrO_(2)中显著促进了金属氧化物催化剂对H_(2)的吸附和解离,有利于合成气活化,同时有助于BiZrO_(x)金属氧化物表面获得高浓度和相对缺电子性的氧空位,提高了催化剂催化活性.合成气转化过程中,合成气转化能力与氧空位浓度呈正相关,Bi掺杂提高了CO的转化率和产物中芳烃的选择性.

Preparation of BiZrOx/ZSM-5 Catalyst for Direct Aromatization of Syngas

Abstract: Nano-BiZrOx metal oxides were composited with ZSM-5 zeolite by supercritical method to obtain bifunctional catalysts for direct syngas aromatization, and the effect of Bi/Zr ratio on the performance of BiZrOx metal oxides and BiZrOx/ZSM-5 bifunctional catalysts for catalytic CO hydrogenation reaction was investigated. The results showed that incorporating a small amount of Bi into ZrO2 significantly promoted the adsorption and dissociation of H2 by the catalysts, thus facilitating the syngas activation. Meanwhile, it also endowed the BiZrOx metal oxide surface with highly concentrated and relatively electron-deficient oxygen vacancies, which improved the catalytic activity. During the syngas conversion process, the syngas conversion capacity was positively correlated with the concentration of oxygen vacancies, and doping Bi element improved the conversion of CO as well as the selectivity of aromatics in the products.