Enhancement of Ammonia Synthesis on a Co3Mo3N-Ag Electrocatalyst in a K-βAl2O3 Solid Electrolyte Cell

被引：17

作者：

Diez-Ramirez, J. ^{[1
]}

Kyriakou, V. ^{[2
,3
]}

Garagounis, I. ^{[2
,3
]}

Vourros, A. ^{[2
,3
]}

Vasileiou, E. ^{[2
,3
]}

Sanchez, P. ^{[1
]}

Dorado, F. ^{[1
]}

Stoukides, M. ^{[2
,3
]}

机构：

[1] Fac Ciencias & Tecnol Quim, Dept Ingn Quim, Ave Camilo Jose Cela 12, Ciudad Real 13071, Spain

[2] Aristotle Univ Thessaloniki, Dept Chem Engn, Thessaloniki 54124, Greece

[3] CERTH, Chem Proc & Energy Resources Inst, Thessaloniki 56071, Greece

来源：

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

关键词：

Ammonia synthesis; Nitride catalysts; Electrochemical promotion; K-beta ''-Al2O3; Cation electrochemical promotion of catalysis; BIMETALLIC NITRIDE CATALYSTS; SITU ELECTROCHEMICAL MODIFICATION; NH3; DECOMPOSITION; IONIC CONDUCTORS; PROMOTION; COMBUSTION; SYSTEM; NEMCA; NA;

D O I：

10.1021/acssuschemeng.7b01618

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The electrochemical promotion of ammonia synthesis by potassium ions (K+) on a Co3Mo3N-Ag electrocatalyst was studied in a K-beta ''-Al2O3 solid electrolyte cell. The effect of temperature (400-550 degrees C), P-H2/P-N2, feed composition (1.0, 3.0 and 6.0) and applied voltage was explored in detail. The catalyst was prepared by ammonolysis of the mixed oxide and was characterized by XRD and SEM. A volcano-type behavior was found, i.e., around 1% of potassium per total moles of Co3Mo3N improved the ammonia formation rate by as much as 48%. However, high percentages of potassium act as poison for the reaction, possibly due to the formation of K-N-H compounds that block the active sites. Faradaic efficiency (Lambda) values close to 300 are for the first time reported in NH3 synthesis.

引用

页码：8844 / 8851

页数：8

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