High-pressure in situ Mossbauer emission spectroscopy study of the sulfidation of calcined Co-Mo/Al2O3 hydrodesulfurization catalysts

被引：20

作者：

Dugulan, AI ^{[1
]}

Crajé, MWJ ^{[1
]}

Kearley, GJ ^{[1
]}

机构：

[1] Delft Univ Technol, Inst Interfac Reactor, NL-2629 JB Delft, Netherlands

来源：

JOURNAL OF CATALYSIS | 2004年 / 222卷 / 01期

关键词：

hydrodesulfurization; Mossbauer emission spectroscopy; sulfide catalysts; Co-Mo-S;

D O I：

10.1016/j.jcat.2003.11.015

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The influence of high pressure on the sulfidation of calcined CoMo/Al2O3 catalysts, under conditions relevant to industry, was studied by means of Mossbauer emission spectroscopy (MES). The measurements were carried out in a high-pressure Mossbauer in situ reactor, which offers the possibility of studying cobalt-based catalysts under realistic hydrotreatment conditions. Activation at 673 K and 4 MPa results in complete sulfidation of Co that has diffused into the Al2O3 support during calcination, the Co-Mo-S structure being the only Co phase present in sulfided industrial CoMo/Al2O3 catalysts. On the basis of comparisons with previous MES results on alumina-supported catalysts it is concluded that the calcination treatment retards the sulfidation of the Co atoms to temperatures where MoS2 particles are already present, favoring Co-Mo-S phase formation. (C) 2003 Elsevier Inc. All rights reserved.

引用

页码：281 / 284

页数：4

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