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《Chinese Journal of Catalysis》 2009-06
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Reduction Performance and Mechanism of Ba-Doped Nano-magnesia-Supported Ru Catalysts for Ammonia Synthesis

HUO Chao,XIA Qinghua,LUO Yan,YANG Xiazhen,LIU Huazhang College of Chemical Engineering and Materials Science,Zhejiang University of Technology,Hangzhou 310032,Zhejiang,China  
Novel Ru-based catalysts were prepared using barium-doped nano-magnesia(Ba-MgO) as supports,which were originally prepared by chemical co-precipitation with ultrasonic treatment.Ba existed in the form of BaCO3 in the support,and thus Ru/Ba-MgO and Ru/La-Ba-MgO catalysts were reduced due to BaO acting as the most activate form.The effect of reduction conditions on the catalytic performance of the ruthenium catalysts was studied using a heating-holding-heating reduction program,and the reduction mechanism of ruthenium catalysts in hydrogen atmosphere was analyzed by transmission electron microscopy,X-ray diffraction,H2 pulse chemical adsorption,thermogravimetry,and temperature-programmed reduction.The results show that the thermal stability of BaCO3 and the agglomeration of Ru particles were the main factors for the catalytic activity of the ruthenium catalysts.Coupling reaction occurred in hydrogen atmosphere,and Ru accelerated the coupling reaction,thus promoting the reduction of the catalyst and enhancing its catalytic activity.
【Fund】: 国家自然科学基金(20203016);; 浙江省自然科学基金(Y406294)
【CateGory Index】: O643.36;TQ113.2
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