The Pore Confinement Effect of FDU-12 Mesochannels on MoS₂Active Phases and Their Hydrodesulfurization Performance

Abstract

FDU-12 silica with highly ordered face-centered cubic mesoporous structure is developed as support to prepare Mo/FDU-12 catalysts for hydrodesulfurization (HDS) of dibenzothiophene (DBT). A series of Mo/FDU-12 catalysts are synthesized by using incipient wetness impregnation method with different MoO3loadings (6, 8, 10, 12, and 15 wt.%). The objective of this work is to explore the pore confinement effect of FDU-12 mesochannels on the MoS2morphology with various metal loadings. It is found that, as increasing MoO3loadings from 6 to 15 wt.%, the MoS2nanocrystallites transform from monolayer to multilayer and the morphology changes from straight layered to curved and then to ring-like and finally to spherical-like morphology due to the restriction of cage-like pore channels of FDU-12 support. The HDS results show that the catalytic activity increases first and then decreases with the best HDS performance at the MoO3loading of 10 wt.%. In addition, we compared the HDS activity of Mo catalyst supported on FDU-12 with that on the commercialγ-Al2O3and SBA-15; the result exhibits that FDU-12 is superior to the other two supports due to its large pore size and ordered three-dimensional open pore channels.

Effects of pore size, mesostructure and aluminum modification on FDU-12 supported NiMo catalysts for hydrodesulfurization

“…FDU-12 is a type of 3D mesoporous material with a cage-like face-centered cubic mesostructure which has been attracted increasing attention as supports for HDS in recent years (Hu et al 2020;Meng et al 2018;Wu et al 2018b;Li et al 2018bLi et al , 2019Liu et al 2016Liu et al , 2017Wang et al 2017;Zhang et al 2017;Du et al 2016). For example, FDU-12based micro-and mesoporous composites (Wu et al 2018b;Li et al 2018b;Du et al 2016), Ti-or Zr-modified FDU-12 (Meng et al 2018;Cao et al 2014), etc.…”

Fine-Tuning Synthesis and Characterization of Mono-Sized H-Beta Zeolite-Supported Palladium-Iridium Nanoparticles and Application in the Selective Hydrogenation of Acetylene

“…The presence of microporous channels favorably affects the mass transfer and diffusion of guest molecules. This is why Beta zeolite has a considerable stability and catalytic activity [30].…”