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

作者：Lin Jianxin^*; Wang Ziqing; Zhang Liuming; Ni Jun; Wang Rong; Wei Kemei

来源：Chinese Journal of Catalysis, 2012, 33(7): 1075-1079.

DOI：10.1016/S1872-2067(11)60413-0

• barium
• zircona
• ruthenium
• ammonia synthesis
• electronic conductivity

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.

• 出版日期2012-7
• 单位福州大学