氟盐溶液处理对Beta分子筛结构、酸性及催化烷基化反应活性的影响

摘要/Abstract

摘要： 采用NH₄F/NH₃.H₂O溶液对Beta分子筛进行改性，考察氟改性对Beta分子筛结构、酸性及其催化烷基化反应活性的影响。结果表明：经过NH₄F/NH₃.H₂O溶液处理，Beta分子筛脱除了非骨架铝，硅铝比增大；Beta分子筛的总酸量、L酸酸量和B酸酸量都相对减少，但B酸酸量占总酸量的比例提高；Beta分子筛介孔比表面积和介孔孔体积增加，提高了其对有机蒸气分子的吸附能力，有利于烷基化原料分子与分子筛酸性位点接触。因此，通过氟改性处理，Beta分子筛催化烷基化反应的性能得到提升。

关键词: 氟化铵, Beta分子筛, 烷基化反应, 2,4,6-三甲基吡啶

Abstract: The Beta zeolite was modified with NH₄F/NH₃.H₂O solution, and the effect of fluorine modification on the structure, acidity and catalytic alkylation activity of the Beta zeolite was investigated. The results show that after being treated with NH₄F/NH₃.H₂O solution, the non-framework aluminum of Beta zeolite was removed and the ratio of n(SiO₂)/n(Al₂O₃) was increased. The total acid, L acid and B acid of Beta zeolite were relatively reduced, but the ratio of B acid to total acid was increased. The mesoporous specific surface area and mesopore volume of Beta zeolite were increased, which improved its adsorption capacity for organic vapor molecules and was favorable for the contact of feed molecules with the acidic sites of zeolite. Therefore, the performance of Beta zeolite catalyst for the alkylation reaction was improved by fluorine modification.

Key words: ammonium fluorine, Beta zeolite, alkylation, 2,4,6-trimethylpyridine

张婷孟璇施力刘乃旺. 氟盐溶液处理对Beta分子筛结构、酸性及催化烷基化反应活性的影响[J]. 石油炼制与化工, 2021, 52(12): 54-59.

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