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Effect of Binder Content on the Properties of Nanocrystalline Zeolite BEA-based Catalysts for Benzene Alkylation with Propylene
Petroleum Chemistry ( IF 1.4 ) Pub Date : 2021-07-30 , DOI: 10.1134/s0965544121080090
T. O. Bok 1 , E. P. Andriako 1 , I. I. Ivanova 1, 2
Affiliation  

Abstract

The effect of binder content (aluminum hydroxide) on the textural, acidic, and catalytic properties of nanocrystalline zeolite BEA-based catalysts for the alkylation of benzene with propylene has been studied. It has been shown that increasing binder content increases the volume of mesopores in the sample and decreases the volume of micro- and macropores. Increased binder content in the catalyst primarily results in a decrease in the concentration of weak acid sites, whereas the concentration of strong acid sites changes only slightly. The observed regularity is associated with the reaction of the binder and the zeolite during the preparation of the catalyst, as well as with the formation of new acid sites. It has been found that increasing binder content increases the mechanical strength of the granulated catalyst, but this is accompanied with a decrease of its catalytic activity and stability in the gas-phase alkylation of benzene with propylene. It has been shown that the optimal content of the Al2O3 binder in the catalyst is about 30 wt %. The sample with the optimal binder content has demonstrated a stable on-stream behavior in the liquid-phase reaction that occurred with 99.4 wt % alkylation selectivity, 91.1 wt % cumene selectivity at 100% propylene conversion.



中文翻译:

粘结剂含量对苯与丙烯烷基化纳米晶沸石 BEA 催化剂性能的影响

摘要

已经研究了粘合剂含量(氢氧化铝)对基于纳米晶沸石 BEA 催化剂的苯与丙烯烷基化的结构、酸性和催化性能的影响。已经表明,增加粘合剂含量会增加样品中中孔的体积并减少微孔和大孔的体积。催化剂中粘合剂含量的增加主要导致弱酸位点浓度的降低,而强酸位点的浓度变化很小。观察到的规律性与催化剂制备过程中粘合剂和沸石的反应以及新酸位点的形成有关。已经发现增加粘合剂含量会增加粒状催化剂的机械强度,但这伴随着其在苯与丙烯的气相烷基化中的催化活性和稳定性的降低。已经表明,Al 的最佳含量催化剂中的2 O 3粘合剂约为30wt%。具有最佳粘合剂含量的样品在液相反应中表现出稳定的在线行为,在 100% 丙烯转化率下,烷基化选择性为 99.4%,异丙苯选择性为 91.1%。

更新日期:2021-08-01
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