Effect of hetero atom on dispersion of NiMo phase on M-SBA-15 (M = Zr, Ti, Ti-Zr)

被引：27
作者：
Mouli, K. Chandra [1 ]
Mohanty, Sidhartha [1 ]
Hu, Yongfeng [1 ]
Dalai, Ajay [1 ]
Adjaye, John [2 ]
机构：
[1] Univ Saskatchewan, Dept Chem Engn, Catalysis & Chem React Engn Labs, Saskatoon, SK S7N 5A9, Canada
[2] Syncrude Edmonton Res Ctr, Edmonton, AB T6N 1H4, Canada
来源：
CATALYSIS TODAY | 2013年 / 207卷
基金：
加拿大自然科学与工程研究理事会;
关键词：
Hydrotreating; TiZr-SBA-15; XANES; Molybdenum phase; Sulfidation; RAY-ABSORPTION-SPECTROSCOPY; MOLYBDENUM OXIDE CATALYSTS; COBALT MOLYBDATE COMOO4; HYDROTREATING CATALYSTS; HYDRODESULFURIZATION CATALYSTS; SELECTIVE OXIDATION; RAMAN-SPECTROSCOPY; PHYSICOCHEMICAL CHARACTERIZATION; NI-MO/AL2O3; CATALYSTS; OXYGEN-CHEMISORPTION;
D O I：
10.1016/j.cattod.2012.07.010
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
NiMo catalysts were prepared on different hetero atom doped SBA-15 supports for hydrotreatment evaluation. The nature of the hetero atom (Ti, Zr and TiZr) was observed to have a profound impact on the final molybdenum phase formed after calcination of the catalysts. Mo L-3 edge XANES analysis of the catalysts along with results from Raman and XRD, show that Zr-SBA-15 support is able to disperse the Molybdenum oxide phase better than the other supports. The formation of bulk phases viz., MoO3 and NiMoO4 is accelerated in pure SBA-15 supports. Evidence of Mo present as tetrahedral MoO4 units was only found in TiZr-SBA-15 support. The presence of tetrahedral Mo species on TiZr-SBA-15 support was attributed to be due to the relative positive charge on the Zr site arising from the electronegative difference between Ti and Zr leading to [MoO4](2-) stabilization. Sulfidation studies of the catalysts revealed that formation of active NiMoS phase is maximum in Zr-SBA-15 support and minimum in the SBA-15 supported catalysts. The low sulfidation of Mo in SBA-15 and TiZr-SBA-15 was due to the presence of bulk MoO3 phase. The hydrotreating activities were in confirmation with the characterization studies, with NiMo/Zr-SBA-15 and NiMo/Ti-SBA-15 exhibiting highest HDS and HDN conversions respectively. (C) 2012 Elsevier B. V. All rights reserved.
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页码：133 / 144
页数：12
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