Abstract
The major challenge in the production of xylene from benzene alkylation with methanol is to avoid the side reaction of methanol with olefins, and this leads to the low utilization efficiency of methanol and the generation of byproduct ethylbenzene. Hierarchical porous Ti-ZSM-5 with appropriate acidity was achieved by substituting part of Al by Ti in the synthesis process, which exhibited the high utilization efficiency of methanol and high suppression of the ethylbenzene formation by the efficient suppression of methanol to olefins.
Highlights
Xylene is an essential intermediate to produce fine chemicals [1]
Modifying the acidity of Zeolite Socony Mobil-5 (ZSM-5) could change the distribution of products in many alkylation reactions, in which decreasing the Brönsted acid could improve the utilization of methanol [11]
This result suggested that only a small number of acid sites were necessary for benzene alkylation with methanol and this was consistent with the result reported by Content/% played a major role in Adebajo et al [24]
Summary
Xylene is an essential intermediate to produce fine chemicals [1]. In recent years, alkylation of benzene has received substantial attention due to its possible role in the production of xylene from fossil fuels [2,3]. (hierarchical porous zeolite) could reveal excellent catalytic performance in the reaction of benzene alkylation with the introduction of the mesopores into zeolite framework [5,9]. There has not been many studies that have shown a significant improvement in inhibiting the competitive reaction of methanol to olefins in benzene alkylation. Modifying the acidity of ZSM-5 could change the distribution of products in many alkylation reactions, in which decreasing the Brönsted acid could improve the utilization of methanol [11]. Si/Al ratio was not effective mainly due to the presence of hexadecyltrimethoxysilane (HTS) inhibiting the movement of Al in the framework for the healing the defective sites [13]. It was observed that hierarchical porous Ti-ZSM-5 catalysts could couldimprove improve utilization efficiency of methanol and suppress the ethylbenzene catalysts thethe utilization efficiency of methanol and suppress the ethylbenzene formation.
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