The Role of Composition for Cobalt Molybdenum Carbide in Ammonia Synthesis

被引：38

作者：

AlShibane, Ihfaf ^{[1
]}

Daisley, Angela ^{[1
]}

Hargreaves, Justin S. J. ^{[1
]}

Hector, Andrew L. ^{[2
]}

Laassiri, Said ^{[1
]}

Rico, Jose L. ^{[3
]}

Smith, Ronald I. ^{[4
]}

机构：

[1] Univ Glasgow, Sch Chem, WestCHEM, Joseph Black Bldg, Glasgow G12 8QQ, Lanark, Scotland

[2] Univ Southampton, Chem, Southampton SO17 1BJ, Hants, England

[3] Univ Michoacana, Fac Ingn Quim, Lab Catalisis, Edificio 6,CU, Morelia 58060, Michoacan, Mexico

[4] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

来源：

ACS SUSTAINABLE CHEMISTRY & ENGINEERING | 2017年 / 5卷 / 10期

基金：

英国工程与自然科学研究理事会;

关键词：

Ammonia synthesis; Mars-van Krevelen; Co3Mo3N; Co3Mo3C; In situ neutron diffraction; VAN KREVELEN MECHANISM; NITROGEN TRANSFER; SYNTHESIS CATALYSTS; NITRIDE CATALYSTS; LATTICE NITROGEN; LOW-PRESSURE; CO3MO3N; N-2; MONONITRIDES; ACTIVATION;

D O I：

10.1021/acssuschemeng.7b02168

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The performance of Co3Mo3N, Co3Mo3C, and Co6Mo6C for ammonia synthesis has been compared. In contrast to Co3Mo3N, which is active at 400 degrees C, a reaction temperature of 500 degrees C, which was preceded by an induction period, was necessary for the establishment of steady state activity for Co3Mo3C. Co6Mo6C was found to be inactive under the conditions tested. During the induction period, nitridation of the Co3Mo3C lattice was found to occur, and this continued throughout the period of steady state reaction with the material transforming in composition toward Co3Mo3N. Taken together, these observations demonstrate that ammonia synthesis activity in ternary cobalt molybdenum systems is associated with the presence of N in the 16c Wyckoff lattice site.

引用

页码：9214 / 9222

页数：9

共 33 条

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