NiW catalyst modified with C12A7-H− and its promotion to hydrogenation selectivity of hydrodesulfurization-猫眼课题宝

DOI：

10.1016/j.fuel.2020.120037

发表时间：

2021-04

期刊：

Fuel

影响因子：

7.4

通讯作者：

中科院分区：

工程技术1区

文献类型：

--

作者：

Xuandong Liu;Lei Li;Huayan Sun;Guangming Wen;Dan Wang;Shenyong Ren;Q. Guo;Zhang Wencheng;Shengbao He;B. Shen

合成了含H-物种的[Ca 24 Al 28 O 64]4+·4（H-）（简称C12 A7-H-）粉末，用于改性NiW催化剂。C12 A7-H−的引入提高了NiW催化剂在二苯并噻吩（DBT）加氢脱硫（HDS）中的反应速率常数和转换频率。表征结果表明，C12 A7-H−的引入促进了NiW催化剂的还原，使NiW催化剂硫化度提高，Ni-W-S物种增多。尽管NiW催化剂的边缘/边缘中心比和刘易斯酸中心减少，但C12 A7-H−的引入仍然增加了NiW催化剂在DBT的HDS中的加氢/直接脱硫比率。此外，在4，6-二甲基二苯并噻吩的HDS中也观察到C12 A7-H−改性的NiW催化剂的较高HDS速率。这可以归因于C12 A7-H−材料可以将活性H物种转移到NiW催化剂，从而提高NiW催化剂的加氢选择性。

[Ca24Al28O64]4+·4(H−) (abbreviated as C12A7-H−) powder containing H−species was synthesized to modify NiW catalyst. The incorporation of C12A7-H−increases the reaction rate constants and turnover frequencies of NiW catalysts in hydrodesulfurization (HDS) of dibenzothiophene (DBT). The characterization results show that the introduction of C12A7-H−promotes the reducibility of NiW catalysts, resulting in higher sulfidation degree and more Ni-W-S species. In spite of the fact that rim/edge sites ratios and Lewis acid sites are decreased, the introduction of C12A7-H−still increases the hydrogenation/direct desulfurization ratios of NiW catalysts in HDS of DBT. Furthermore, higher HDS rates of C12A7-H−modified NiW catalysts are also observed in HDS of 4,6-dimethyldibenzothiophene. These can be attributed to C12A7-H−material that may transfer active H species to NiW catalysts and thereby promote the hydrogenation selectivity of NiW catalyst.