Ammonia Synthesis over Ruthenium Catalysts using Barium-Doped Zirconia as Supports Prepared by Citric Acid Method

被引：24

作者：

Lin Jianxin ^{[1
]}

Wang Ziqing ^{[1
]}

Zhang Liuming ^{[1
]}

Ni Jun ^{[1
]}

Wang Rong ^{[1
]}

Wei Kemei ^{[1
]}

机构：

[1] Fuzhou Univ, Natl Engn Res Ctr Chem Fertilizer Catalyst, Fuzhou 350002, Fujian, Peoples R China

来源：

CHINESE JOURNAL OF CATALYSIS | 2012年 / 33卷 / 07期

关键词：

barium; zircona; ruthenium; ammonia synthesis; electronic conductivity; RU; SURFACE; HYDROGEN;

D O I：

10.1016/S1872-2067(11)60413-0

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Barium-promoted zirconia (Ba-ZrO2) was synthesized by the citric acid method and used as supports for Ru/Ba-ZrO2 catalysts, which were prepared by incipient wetness impregnation with K2RuO4 as precursor. The obtained Ba-ZrO2 and catalysts were characterized by X-ray diffraction and CO2 temperature-programmed desorption. The effect of Ba content on the structure and catalytic activity of K-Ru/Ba-ZrO2 catalysts is discussed. The formation of BaZrO3 can improve significantly the catalytic activity of Ru/Ba-ZrO2 for ammonia synthesis. The ammonia concentration and rate of ammonia synthesis of the K-Ru/Ba-ZrO2 catalyst (molar ratio of Ba:Zr is 1:1) were 9.24% and 29.77 mmol/(g.h), respectively, at 425 degrees C, 5.0 MPa, and 10000 h(-1). Improvements in electron conductivity and the basic nature of the catalyst may be the main reasons for such high catalytic activity in ammonia synthesis.

引用

页码：1075 / 1079

页数：5

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