Co取代的六铁酸盐在N2O催化分解反应中的应用

doi:10.1016/S1872-2067(12)60587-7

催化学报

Co取代的六铁酸盐在N₂O催化分解反应中的应用

Barkat Ul-AIN^a,b, Safeer AHMED^b, 黄延强^a

a 中国科学院大连化学物理研究所催化基础国家重点实验室, 辽宁大连 116023;
b 伊斯兰堡奎德-i-阿扎姆大学化学系, 巴基斯坦伊斯兰堡 45320

收稿日期:2013-02-08 修回日期:2013-03-19 出版日期:2013-07-16 发布日期:2013-07-16
通讯作者: 黄延强
基金资助:
中国科学院; 第三世界科学院; 巴基斯坦高等教育委员会; 国家自然科学基金(21103173).

Catalytic decomposition of N₂O on cobalt substituted barium hexaferrites

Barkat UL-AIN^a,b, Safeer AHMED^b, HUANG Yanqiang^a

a State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning, China;
b Department of Chemistry, Quaid-i-Azam University Islamabad, 45320, Islamabad, Pakistan

Received:2013-02-08 Revised:2013-03-19 Online:2013-07-16 Published:2013-07-16
Supported by:
This work was supported by the Chinese Academy of Sciences (CAS), the Third World Academy of Sciences (TWAS), Higher Education Commission (HEC) Pakistan, and the National Natural Science Foundation of China (21103173).

摘要/Abstract

摘要： 采用溶胶-凝胶法制备了Co取代的Ba₂Mg_2-xCo_xFe₁₂O₂₂(x=0.0~2.0)催化剂,并考察了其在高浓度N₂O(30vol%)分解反应中的催化活性.结果表明,Co的取代显著提高了Ba₂Mg₂Fe₁₂O₂₂催化剂活性,当x=2时,N₂O的完全分解温度从1123K降至973K;提高催化剂焙烧温度会导致其表面积降低,进而降低其催化活性;但采用微波加热则能显著提高催化剂活性.

关键词: 一氧化二氮, 分解, 六铁酸盐, Ba₂Mg₂Fe₁₂O₂₂, 钴, 微波

Abstract: Catalytic decomposition of N₂O was studied over Co substituted Mg-Y type hexaferrites (Ba₂Mg_2-xCo_xFe₁₂O₂₂, x = 0.4-2.0). The materials were synthesized by a sol-gel method using citric acid as the chelator followed by calcination at 1223 K for 5 h. X-ray diffraction, thermogravimetric analysis/derivative thermogravimetric, scanning electron microscopy, and N₂ adsorption techniques were used to confirm the formation of hexaferrite. The Ba₂Mg_2-xCo_xFe₁₂O₂₂ catalysts displayed good activity for decomposition of high concentration N₂O (30 vol%), and complete substitution of Mg for Co lowered the complete conversion temperature from 1123 K to 973 K. Increasing calcination temperature suppressed the catalytic activity by deteriorating surface area. Moreover, coupling microwave discharge significantly boosted the catalytic activity. Co substituted Mg-Y type hexaferrites are potentially active and thermally stable to be used as catalyst for high concentration N₂O decomposition.

Key words: Nitrous oxide, Decomposition, Hexaferrite, Ba₂Mg₂Fe₁₂O_22, Cobalt, Microwave

Barkat Ul-AIN, Safeer AHMED, 黄延强. Co取代的六铁酸盐在N₂O催化分解反应中的应用[J]. 催化学报, DOI: 10.1016/S1872-2067(12)60587-7.

Barkat UL-AIN, Safeer AHMED, HUANG Yanqiang. Catalytic decomposition of N₂O on cobalt substituted barium hexaferrites[J]. Chinese Journal of Catalysis, DOI: 10.1016/S1872-2067(12)60587-7.

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Co取代的六铁酸盐在N₂O催化分解反应中的应用

Catalytic decomposition of N₂O on cobalt substituted barium hexaferrites

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