氧化铝载体和氧化钡助剂对钌基氨合成催化剂结构和性能的影响

doi:10.3866/PKU.WHXB20101223

Abstract

Abstract:

A series of Ba-Ru/Al₂O₃ catalysts were prepared by the impregnation method using industrial alumina (Al₂O₃-1) and synthesized alumina (Al₂O₃-2) as supports. The catalysts were characterized by X-ray diffraction, N2 adsorption-desorption, X-ray fluorescence spectroscopy, transmission electron microscopy, H₂ temperature-programmed reduction, NH₃ temperature-programmed desorption, and X-ray photoelectron spectroscopy. The effect of Al₂O₃ and the BaO promoter on the phase structure, texture properties, morphology, surface properties, and catalytic activity in ammonia synthesis were investigated. The results indicate that the physical and chemical properties of Al₂O₃ have a strong impact on the structure and activity of the ruthenium catalysts. The BaO promoter has a strong impact on the ruthenium catalyst in two ways: first, the amount of BaO added leads to a difference in the interaction between BaO and γ-Al₂O₃, which further influences the specific area and the porous structure of the catalysts; second, the addition of BaO influences the reduction process and the surface acidity and alkaline properties of the ruthenium catalysts. A proper amount of BaO promotes the activity and the optimal amount of BaO depends on the properties of the supports.

Key words: Ammonia synthesis, γ-Al₂O₃, Support, Ruthenium, Reduce, Acidity

MSC2000:

O643.3

YANG Xiao-Long, XIA Chun-Gu, TANG Li-Ping, XIONG Xu-Mao, MU Xin-Yuan, HU Bin. Effect of Alumina Support and Barium Oxide on the Structure and Catalytic Activity of Ruthenium Catalysts for Ammonia Synthesis[J].Acta Phys. -Chim. Sin., 2010, 26(12): 3263-3272.

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Effect of Alumina Support and Barium Oxide on the Structure and Catalytic Activity of Ruthenium Catalysts for Ammonia Synthesis

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