摘要：Y zeolites modified by gallium (Ga)via three different modification methods (impregnation, post-synthesis and in situ synthesis)were synthesized, and the synthesized supports were impregnated by NiMo precursors. Characterization techniques such as XRD, N2 physical adsorption-desorption, ICP-OES, FT-IR, ⁷¹Ga MAS NMR, Py-FTIR, H2-TPR, HRTEM and XPS were performed to determine the effects of each modification of Y zeolite by Ga on the properties of the prepared supports and catalysts. Finally, 4,6-dimenthyldibenzothiophene (4,6-DMDBT)was used as a probe to evaluate the effects of the modification of Y zeolite by Ga on the catalytic performance of the prepared catalysts. The results show that the Modification of Y zeolite by Ga affected the position of the Ga species: in the impregnation modification method, Ga species deposited on the surface of Y zeolite mainly exist as non-framework Ga2O3; in the post-synthesis modification method, Ga species are introduced to the near-surface area and mainly exist as framework Ga species; and in the in situ synthesis modification method, Ga species are introduced throughout the whole framework and exist as framework Ga species. Ga species located at the surface and near-surface area effectively prevent the formation of strong Mo-O-Al bonds, which results in both modulated acidity and weakened interactions between active metals and the support (MSI). The hydrodesulfurization (HDS)results also show that the effects of Ga on NiMoS/Y-zeolite play a very important role in the catalytic performance of the corresponding catalysts. The superior HDS performance of the catalyst NiMo/GaHY (prepared via post-synthesis method)can be attributed to the better accessibility of active sites, the modulated acidity property, the proper MSI, the higher proportion of the NiMoS phase, the higher isomerization activity and the higher matching between hydrogenation activity and hydrolysis activity.
© 2019 Elsevier Inc.

ISSN号：0021-9517

卷、期、页：p345-359

发表日期：2019-06-01

期刊分区（SCI为中科院分区）：一区

收录情况：SCI（科学引文索引印刷版）,ESI（基本科学指标数据库）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：Journal of Catalysis

参与作者：周文武,周安宁,张雅婷,张翠翠,陈志平,刘浪,陶秀娟

第一作者：周亚松,魏强

论文类型：期刊论文

论文概要：周文武,周安宁,张雅婷,张翠翠,陈志平,刘浪,周亚松,魏强,陶秀娟，Hydrodesulfurization of 4,6-dimethyldibenzothiophene over NiMo supported on Ga-modified Y zeolites catalysts，Journal of Catalysis，2019，p345-359

论文题目：Hydrodesulfurization of 4,6-dimethyldibenzothiophene over NiMo supported on Ga-modified Y zeolites catalysts