制备方法对Ag-Ru/CeO<sub>2</sub>氨合成催化剂性能的影响

引用本文: 张留明, 林建新, 王榕, 魏可镁. 制备方法对Ag-Ru/CeO₂氨合成催化剂性能的影响[J]. 物理化学学报, 2011, 27(11): 2646-2650. doi: 10.3866/PKU.WHXB20111129 shu

Citation: ZHANG Liu-Ming, LIN Jian-Xin, WANG Rong, WEI Ke-Mei. Effect of Preparation Methods on the Catalytic Activity of Ag-Ru/CeO₂ Catalyst for Ammonia Synthesis[J]. Acta Physico-Chimica Sinica, 2011, 27(11): 2646-2650. doi: 10.3866/PKU.WHXB20111129 shu

制备方法对Ag-Ru/CeO₂氨合成催化剂性能的影响

基金项目:
中国石油科技创新基金(2010D-5006-0502) (2010D-5006-0502)

国家科技支撑计划(2007BAE08B02)资助项目 (2007BAE08B02)

摘要: 采用共沉淀法(CP)、改性沉淀沉积法(MDP)、浸渍法(IP)制备了Ag-Ru/CeO₂催化剂, 并运用N₂ 物理吸附、X射线衍射(XRD)、H₂程序升温还原(H₂-TPR)、N₂程序升温脱附(N₂-TPD)等技术对其进行了表征, 考察了不同制备方法对Ag-Ru/CeO₂催化剂氨合成性能的影响. 结果表明: 不同方法制备的催化剂, 银助剂对载体的还原性能和氮气的解离吸附性能的影响存在明显的差别, 从而影响了催化剂的氨合成活性, 其中采用浸渍法制备的催化剂氮气解离吸附最强, 载体最易于还原, 因此催化剂低温氨合成活性最高, 在10 MPa, 10000 h^-1, 400°C反应条件下, 出口氨浓度达到9.4%.

关键词:

浸渍法
/ 氨合成
/ 银
/ 二氧化铈
/ 钌

English

Effect of Preparation Methods on the Catalytic Activity of Ag-Ru/CeO₂ Catalyst for Ammonia Synthesis

1.
National Engineering Research Center of Chemical Fertilizer Catalyst, Fuzhou University, Fuzhou 350002, P.R. China
Received Date: 11 June 2011
Available Online: 27 October 2011
Fund Project:
中国石油科技创新基金(2010D-5006-0502)

国家科技支撑计划(2007BAE08B02)资助项目

Abstract: Ag-Ru/CeO₂ catalysts were prepared by co-precipitation (CP), modified deposition precipitation (MDP), and incipient-wetness impregnation (IP). The obtained catalysts were characterized by N₂ physisorption, X-ray diffraction (XRD), H₂ temperature-programmed reduction (H₂-TPR), and temperatureprogrammed desorption of nitrogen (N₂-TPD). The results showed that the ammonia synthesis activity of the Ag-Ru/CeO₂ catalyst prepared by incipient-wetness impregnation was 9.4% at 10 MPa, 10000 h^-1 and 400°C, which was higher than that obtained by other methods. There were obvious differences in the reduction property of Ru/CeO₂ and in the nitrogen dissociation behavior among the catalysts prepared by different methods. Catalyst activity for the catalyst prepared by incipient-wetness impregnation improved greatly at a low reaction temperature. The high catalytic activity was due to the easier reduction of Ag-Ru/ CeO₂ and the higher amount of dissociation of chemisorbed nitrogen.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

制备方法对Ag-Ru/CeO₂氨合成催化剂性能的影响

English

Effect of Preparation Methods on the Catalytic Activity of Ag-Ru/CeO₂ Catalyst for Ammonia Synthesis

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

制备方法对Ag-Ru/CeO2氨合成催化剂性能的影响

English

Effect of Preparation Methods on the Catalytic Activity of Ag-Ru/CeO2 Catalyst for Ammonia Synthesis

CCS Chemistry：嵌段共聚物自组装成 “三明治”二维有机材料，实现纳米级压力传感功能

CCS Chemistry：颜徐州、鲍哲南： 你的皮肤可能是一片SPMs

CCS Chemistry：工作高效不疲劳，只须让催化剂动起来

CCS Chemistry：静电组装导向聚合- 聚电解质纳米凝胶量化制备新策略

CCS Chemistry：金黄色葡萄球菌醛基脱氢酶是如何识别特异性底物的？

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中国化学会秘书处

制备方法对Ag-Ru/CeO₂氨合成催化剂性能的影响

Effect of Preparation Methods on the Catalytic Activity of Ag-Ru/CeO₂ Catalyst for Ammonia Synthesis

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