铁铜双金属催化剂选择性催化氧化氨为氮气

引用本文: 孙萌萌, 曹毅, 兰丽, 邹莎, 房志涛, 陈耀强. 铁铜双金属催化剂选择性催化氧化氨为氮气[J]. 物理化学学报, 2014, 30(12): 2300-2306. doi: 10.3866/PKU.WHXB201409291 shu

Citation: SUN Meng-Meng, CAO Yi, LAN Li, ZOU Sha, FANG Zhi-Tao, CHEN Yao-Qiang. Selective Catalytic Oxidation of Ammonia to Nitrogen over Iron and Copper Bimetallic Catalysts[J]. Acta Physico-Chimica Sinica, 2014, 30(12): 2300-2306. doi: 10.3866/PKU.WHXB201409291 shu

铁铜双金属催化剂选择性催化氧化氨为氮气

基金项目:
国家自然科学基金(21173153) (21173153)

国家高技术研究发展计划项目(863) (2013AA065304) (863) (2013AA065304)

四川省科技厅科技支撑项目(2011GZ0035, 2012FZ0008)资助 (2011GZ0035, 2012FZ0008)

摘要:

固定铜铁的总质量不变, 采用共浸渍法制备铜铁双金属催化剂. 为了更好地了解催化剂的性质, 分别用N₂吸附-脱附、H₂-程序升温还原(H₂-TPR)、NH₃-程序升温脱附(NH₃-TPD)、X射线衍射(XRD)和X射线光电子能谱(XPS)方法对制备的催化剂进行表征. 研究发现在100000 h^-1空速下, 铜铁双金属催化剂呈现出好的活性和氮气选择性. 在低温区, 随着铜含量的增加, 活性和氮气的选择性增加, 然而在高温区氮气的选择性直接和铁的含量相关. 其中催化剂Fe_0.25Cu_0.75/ZSM-5, 在350℃氨的转化率达到最高, 在300℃氮气的选择性上升到97%. Fe_0.75Cu_0.25/ZSM-5 在500 ℃有很高的氮气选择性甚至可以达到98%. 并且所有的催化剂均产生很少的N₂O副产物. 表征结果显示催化剂的酸量和铜物种的含量可以影响催化剂的活性, 并且高的还原能力和铁含量有助于高温氮气选择性的提高.

关键词:

铁
/ 铜
/ 分子筛
/ 氨氧化反应
/ N₂选择性
/ 催化剂

English

Selective Catalytic Oxidation of Ammonia to Nitrogen over Iron and Copper Bimetallic Catalysts

1.
Key Laboratory of Green Chemistry & Technology of the Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, P. R. China
Received Date: 16 June 2014
Available Online: 27 November 2014
Fund Project:
国家自然科学基金(21173153)

国家高技术研究发展计划项目(863) (2013AA065304)

四川省科技厅科技支撑项目(2011GZ0035, 2012FZ0008)资助

Abstract:

Iron and copper bimetallic catalysts with fixed total contents of copper and iron were prepared by a co-impregnation method, and then used for selective catalytic oxidation of ammonia to nitrogen. The properties of the catalysts were characterized by N₂ adsorption-desorption, H₂ temperature-programmed reduction (H₂- TPR), NH₃ temperature-programmed desorption (NH₃-TPD), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS). The iron and copper bimetallic catalysts exhibited od activity and high selectivity of N₂ at the gas hourly space velocity (GHSV) of 100000 h^-1. The activity and N₂ selectivity in the low temperature range increased with increasing Cu loading, whereas in the high temperature range (above 400 ℃) the selectivity of N₂ was directly related to the content of iron. The highest NH₃ conversion was achieved at about 350℃ for Fe_0.25Cu_0.75/ZSM-5, and the N₂ selectivity was up to 97% at 300 ℃. On the other hand, the extremely high N₂ selectivity about 98% was obtained over Fe_0.75Cu_0.25/ZSM-5 at 500 ℃. In addition, N₂O as the by-product and greenhouse gas was obtained in very low amounts for all the catalysts. The characterization results showed that the activity was influenced by the acid content and the amounts of copper species. Moreover, the highly reducing capacity could improve the N₂ selectivity.

Key words:

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

铁铜双金属催化剂选择性催化氧化氨为氮气

English

Selective Catalytic Oxidation of Ammonia to Nitrogen over Iron and Copper Bimetallic Catalysts

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

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通讯作者: 陈斌, bchen63@163.com

中国化学会秘书处

铁铜双金属催化剂选择性催化氧化氨为氮气

English

Selective Catalytic Oxidation of Ammonia to Nitrogen over Iron and Copper Bimetallic Catalysts

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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