| 沉淀方法对Ru/CeO_2氨合成催化剂催化性能的影响 |
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| 引用本文： | 罗小军,王榕,林建新,魏可镁.沉淀方法对Ru/CeO_2氨合成催化剂催化性能的影响[J].催化学报,2009,30(11). |
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| 作者姓名： | 罗小军 王榕 林建新 魏可镁 |
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| 作者单位： | 福州大学化肥催化剂国家工程研究中心,福建福州,350002 |
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| 基金项目： | 国家自然科学基金，国家科技支撑计划，福建省科技重大专项 |
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| 摘 要： | 采用沉淀法制备了Ru/CeO_2氨合成催化剂,并运用N_2物理吸附、X射线衍射、X射线荧光光谱、CO吸附和H2程序升温还原等技术对其进行了表征,考察了沉淀时反应液的并流、反加、正加以及沉积一沉淀对所制备的Ru/CeO_2催化剂氨合成性能的影响.结果表明,不同制备方法所得到的催化剂,其氯残留量和载体的还原性能都存在明显的差别,最终影响了催化剂的氨合成活性,其中采用正加法制备的催化剂上氯残留量少,载体易还原,因而催化活性最高,在10MPa,10 000h~(-1),450℃反应时,NH_3浓度达到11.9%.
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| 关 键 词： | 沉淀方法 氨合成 二氧化铈 钌 共沉淀 沉积-沉淀 |
Effect of Precipitation Methods on Catalytic Activity of Ru/CeO_2 Catalyst for Ammonia Synthesis |
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| LUO Xiaojun,WANG Rong,LIN Jianxin,WEI Kemei.Effect of Precipitation Methods on Catalytic Activity of Ru/CeO_2 Catalyst for Ammonia Synthesis[J].Chinese Journal of Catalysis,2009,30(11). |
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| Authors: | LUO Xiaojun WANG Rong LIN Jianxin WEI Kemei |
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| Institution: | LUO Xiaojun,WANG Rong,LIN Jianxin,WEI Kemei National Research Center of Chemical Fertilizer Catalysts,Fuzhou University,Fuzhou 350002,Fujian,China |
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| Abstract: | The Ru/CeO2 catalyst was prepared by precipitation methods, including normal precipitation, reverse precipitation, parallel flow precipitation, and deposition-precipitation. The obtained catalysts were characterized by N2 adsorption-desorption, X-ray diffraction, H2 temperature-programmed reduction, CO chemisorption, and X-ray fluorescence spectroscopy. The results showed that the ammonia synthesis activity of the Ru/CeO2 catalyst prepared by normal precipitation was 11.9% at 10 MPa, 10000 h-1, and 450 oC, ... |
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| Keywords: | precipitation method ammonia synthesis cerium dioxide ruthenium co-precipitation deposition-precipitation |
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