表面性质对甲烷芳构化Mo基催化剂反应性能的影响

Effect of Surface Character to the Reaction Performance of Mo Catalyst for Methane Aromatization

研究了不同载体对 Mo基催化剂反应性能的影响 ,发现对于在无氧条件下的甲烷芳构化反应 ,分子筛酸性、结构和金属氧化物的存在这 3个因素是至关重要的 .考察了作为第 2组分的 Zn、W、Cu、Cr、Ni5种元素对Mo/ HZSM- 5反应性能的影响 ,发现第 2组分的添加均在不同程度上提高了催化剂的甲烷芳构化活性和选择性 .异丙醇分解反应的结果表明 ,Zn、W、Cu的加入 ,增加了催化剂的脱氢中心强度 ,Cr、Ni的加入 ,增加了催化剂的酸中心强度 .

The study of the effect of support indicated that: under O\-2\|free condition, acidity, pore channel structure of zeolite and the presentation of metal\|oxide species are crucial factors for the catalytic performance in methane aromatization. The promotional effects of the addition of Zn, W, Cu, Cr and Ni on methane aromatization performance of Mo/HZSM\|5 catalyst were investigated. The results of isopropanol decomposition reveal that the addition of Zn, W, Cu enhances the intensity of dehydrogenating sites of the catalyst, and the addition of Cr and Ni increases the acidity of the catalyst.