Dry citrate-precursor synthesized nanocrystalline cobalt oxide as highly active catalyst for total oxidation of propane
Dry citrate-precursor synthesized nanocrystalline cobalt oxide as highly active catalyst for total oxidation of propane
复制标题
干柠檬酸盐前体合成纳米晶氧化钴作为丙烷全氧化的高活性催化剂
DOI：
10.1016/j.jcat.2009.01.018
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发表时间：
2009-04-01
影响因子：
7.3
通讯作者：
Fan, Kang-Nian
中科院分区：
文献类型：
--
作者：
Liu, Qian;Wang, Lu-Cun;Fan, Kang-Nian
采用软反应研磨法制备了一系列纳米晶钴氧化物（Co 3 O 4）基催化剂。该催化剂对丙烷催化燃烧具有良好的活性和稳定性。在低至240 ℃的反应温度下已实现完全转化。与现有文献中的高活性Co_3O_4催化剂相比，本工作中的催化剂显示出特别高的丙烷全氧化比速率（约1000 ℃）。91.3 mmolc（3）m（-2）h（-1）在200 ℃）。O-2-TPD结果与Co 3 O 4活性之间的相关性表明，高浓度的表面亲电氧（O-）物质对于实现高活性很重要。柠檬酸盐前驱体研磨引起的晶格畸变是形成和维持高密度表面缺陷的关键因素，这导致了钴尖晶石催化剂的高活性和高稳定性。(C)2009 Elsevier Inc. All rights reserved.
A set of nanocrystalline cobalt oxide (Co3O4)-based catalysts have been prepared by means of an innovative soft reactive grinding (SRG) procedure. The catalysts exhibited excellent activities and high stabilities for propane catalytic combustion. Complete conversion has been achieved at reaction temperatures as low as 240 degrees C. Comparing with the highly active Co3O4 catalysts in the current literature, the catalysts in this work show exceptionally high specific rate for propane total oxidation (ca. 91.3 mmolc(3) m(-2) h(-1) at 200 degrees C). A correlation between the O-2-TPD results and the activity for Co3O4 reveals that a high concentration of superficial electrophilic oxygen (O-) species is important for achieving a high activity. The prominent lattice distortion induced by prolonged citrate-precursor grinding is suggested to play a key role in creating and maintaining a high density of surface defects, which leads to highly activity and stability of the cobalt spinel catalyst. (C) 2009 Elsevier Inc. All rights reserved.