Conversion of alkylphenol to phenol via transalkylation using zeolite catalysts
Conversion of alkylphenol to phenol via transalkylation using zeolite catalysts
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DOI：
10.1016/j.cattod.2018.08.009
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发表时间：
2020-05
期刊：
影响因子：
5.3
通讯作者：
T. Yoshikawa;Takahiro Umezawa;Y. Nakasaka;T. Masuda
中科院分区：
文献类型：
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作者：
T. Yoshikawa;Takahiro Umezawa;Y. Nakasaka;T. Masuda
木质素衍生的酚通常是被各种官能团取代的混合物，需要进一步催化重整以产生酚。在这项研究中，木质素相关的模型化合物，即，采用间歇式反应器，研究了在苯溶剂中，在沸石催化剂上对丙基苯酚的反应，以探索利用木质素衍生的酚类混合物的新途径。具有三维孔结构的MFI型沸石对对丙基苯酚的烷基转移反应具有很高的活性，主要产物为苯酚和C3-苯类化合物，包括丙苯和异丙苯。虽然在400 °C下超过2 h的较长反应时间导致所得苯酚和C3-苯的连续反应，导致产物选择性降低，但几乎不产生源自聚合反应的重组分。此外，还发现苯在超临界条件下对抑制沸石催化剂上的积炭起着至关重要的作用。因此，该方法可应用于从木质素衍生的酚联产酚和烷基化苯。
Lignin-derived phenols are generally mixtures substituted with various functional groups, requiring further catalytic reforming to produce phenol. In this study, transalkylation of a lignin-related model compound, i.e.,p-propylphenol, over zeolite catalysts in benzene solvent was investigated using a batch-type reactor for a new approach to utilizing lignin-derived phenolic mixtures. MFI-type zeolite, having a three-dimensional pore structure, showed high activity for the transalkylation ofp-propylphenol, yielding phenol and C3-benzenes including propylbenzene and cumene as main products. Although a longer reaction time of over 2 h at 400 °C led to consecutive reactions of the obtained phenol and C3-benzenes, resulting in decreased product selectivity, heavy components derived from polymerization reactions were hardly produced. In addition, it was indicated that benzene under supercritical conditions played a crucial role for suppressing coke formation on the zeolite catalyst. This process, therefore, can be applied to the co-production of phenol and alkylated benzenes from lignin-derived phenols.