Deep insights into enhanced direct-desulfurization selectivity of thiourea-modified CoMoP/γ-Al2O3: An investigation of catalyst microstructures. (1st May 2020)

• Record Type: Journal Article
• Authors: Wang, Shen; Zhang, Jingcheng; Liu, Dan; Nan, Jun; Sun, Yanmin; Gui, Jianzhou; Yu, Haibin
• Is Part Of: Fuel. Volume 267(2020)
• Publication Date: 2020-05-01
• Subjects: Direct desulfurization -- MoS2 -- Complexing agent -- Impregnation; Fuel -- Periodicals; Coal -- Periodicals; Coal; Fuel; Periodicals; 662.6
• DOI: 10.1016/j.fuel.2019.116993
• Languages: English
• ISSNs: 0016-2361

Abstract

Graphical abstract: Highlights: High DDS Selective CoMoP/γ-Al2 O3 Catalysts was obtained using thiourea. The addition of thiourea leads to high stacking layers and short slab length of MoS2 . The increasing Co/Mo ratio at the edge, i.e., active Co-Mo-S sites, facilitates the DDS route. The increasing Brӧnsted acid sites of CoMoP-Th contributes to the higher DDS selectivity. Abstract: Decreasing hydrogen consumption is the most challenging in industrial HDS technology. A series of CoMoP/γ-Al2 O3 HDS catalysts were prepared with different complexing agents and studied by XRD, XPS, Py-FTIR, HRTEM, and H2 -TPR. The adding of thiourea leads to weak interaction between metal and the supports, and shows small MoS2 slab with high stacking layers in its microstructure, leading to the increasing ratio of active CoMoS phase at the edge, finally results in high direct desulfurization selectivity; meanwhile, the highest Bronsted acid amount obtained from pyridine-FTIR results also facilitate the high DDS selectivity. These provide a sample method to modulate the direct desulfurization selectivity of HDS catalyst and correlate their microstructure and catalytic performance.