Molybdenum nitrides: a study of synthesis variables and catalytic performance in acetylene hydrogenation

被引：24

作者：

Cardenas-Lizana, Fernando ^{[1
]}

Lamey, Daniel ^{[2
]}

Kiwi-Minsker, Lioubov ^{[2
,3
]}

Keane, Mark A. ^{[1
]}

机构：

[1] Heriot Watt Univ, Sch Engn & Phys Sci, Chem Engn, Edinburgh EH14 4AS, Midlothian, Scotland

[2] Ecole Polytech Fed Lausanne GGRC ISIC EPFL, Grp Catalyt React Engn, CH-1015 Lausanne, Switzerland

[3] Tver State Univ, Reg Technol Ctr, Tver 170100, Russia

来源：

JOURNAL OF MATERIALS SCIENCE | 2018年 / 53卷 / 09期

基金：

俄罗斯科学基金会; 瑞士国家科学基金会;

关键词：

SELECTIVE HYDROGENATION; SURFACE-AREA; PD NANOPARTICLES; GREEN-OIL; REDUCTION; PHASE; MO2N; MECHANISMS; OXIDE; HYDRODENITROGENATION;

D O I：

10.1007/s10853-018-2009-x

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We have examined the catalytic action of beta- and gamma-Mo2N in the partial hydrogenation of acetylene. The influence of variations in GHSV (230-1600 min(-1)), feed composition (5-30% v/v N-2/H-2), heating rate (0.1-5 K min(-1)) and isothermal hold (1-7 h at 933 K) on nitride structural properties has been assessed. At >= 2 K min(-1), beta-Mo2N (<= 15 m(2) g(-1)) consisting of small crystallites (< 5 mu m) was generated. At <= 0.5 K min(-1), gamma-Mo2N with a platelet morphology and surface area >= 45 m(2) g(-1) was formed. High GHSV, low N-2 feed content and a prolonged isothermal hold served to increase gamma-Mo2N area (to 135 m(2) g(-1)). Lower alkene selectivity and a twofold higher specific (per m(2)) acetylene hydrogenation rate were recorded for beta-Mo2N and linked to higher surface Mo/N ratio (from XPS). Olefin selectivity for both nitrides was greater than that reported for Pd catalysts. Moreover, we recorded negligible green oil formation in reactions over gamma-Mo2N.

引用

页码：6707 / 6718

页数：12