Formation, structure, and HDN activity of unsupported molybdenum phosphide

被引：166

作者：

Stinner, C ^{[1
]}

Prins, R ^{[1
]}

Weber, T ^{[1
]}

机构：

[1] Swiss Fed Inst Technol, Tech Chem Lab, ETH, CH-8092 Zurich, Switzerland

来源：

JOURNAL OF CATALYSIS | 2000年 / 191卷 / 02期

关键词：

molybdenum; phosphides; catalyst preparation; molybdophosphates; Raman spectroscopy; hydrodenitrogenation;

D O I：

10.1006/jcat.1999.2808

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：

A molybdenum phosphide catalyst was prepared from an aqueous solution of (NH4)(6)Mo7O24. 4H(2)O and (NH4)(2)HPO4 by precipitation, calcination, and subsequent reduction in H-2 at 923 K. Raman spectroscopic measurements revealed that the aqueous solution contained MoO42-, HPO42-, and P2Mo5O236- anions. Powder XRD measurements showed that pure molybdenum phosphide had formed after precipitation and reduction with H-2. MoP crystallizes in the tungsten carbide structure in which each Mo atom is trigonal-prismatically coordinated by six P atoms. The molybdenum phosphide was tested for catalytic activity in the HDN reaction of o-propylaniline at 643 K and 3.0 MPa. The intrinsic HDN activity of the surface Mo atoms of MoP was about 6 times higher than that of Mo edge atoms in gamma-Al2O3-supported MoS2. Their selectivity is comparable to that of an Ni-promoted MoS2 catalyst. (C) 2000 Academic Press.

引用

页码：438 / 444

页数：7

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