The effects of alkali metal on structure of manganese oxide supported on SBA-15 for application in the toluene catalytic oxidation
发表时间：2019-03-09
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- 论文类型：
- 期刊论文
- 第一作者：
- Qu, Zhenping
- 通讯作者：
- Qu, ZP (reprint author), Dalian Univ Technol, Sch Environm Sci & Technol, Key Lab Ind Ecol & Environm Engn MOE, Linggong Rd 2, Dalian 116024, Peoples R China.
- 合写作者：
- Bu, Yibin,Qin, Yuan,Wang, Yi,Fu, Qiang
- 发表时间：
- 2012-10-15
- 发表刊物：
- CHEMICAL ENGINEERING JOURNAL
- 收录刊物：
- SCIE、EI、Scopus
- 文献类型：
- J
- 卷号：
- 209
- 页面范围：
- 163-169
- ISSN号：
- 1385-8947
- 关键字：
- Toluene; Mn/SBA-15; K; FTIR; Adsorption sites
- 摘要：
- The effects of alkali metal on the toluene catalytic oxidation were studied over the manganese oxide supported on SBA-15. Their properties were characterized by temperature programmed reduction (TPR), X-ray diffraction (XRD), diffuse reflectance spectra (DRS) and Fourier transform infrared (FTIR) techniques. It was found that the K/Mn molar ratios over the range of 0.1/1-0.3/1 greatly influenced the structure of the catalyst and the activity for toluene oxidation. When the K/Mn molar ratio was lower than 0.125/1, it led to a decrease in the dispersion of metal oxide particles and the reducibility, resulting in low reactivity for toluene oxidation. Increasing the K/Mn molar ratios to 0.15/1-0.18/1 resulted in the transformation of parts of MnO2 into Mn2O3, and accompanying with the high dispersion of metal oxides and better reducibility. The catalytic activity was obviously increased when the K/Mn molar ratio was 0.15/1-0.18/1. The reactivity of the sample with K/Mn above 0.18/1, however, declined sharply due to the blocking of active sites by K. Two important adsorption sites existed on the KMn/SBA-15 system, in which one was isolated OH groups on the SBA-15 and the other was the activated Si-O-Mn bond under the effect of K. (C) 2012 Elsevier B.V. All rights reserved.
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