Indexed by:
期刊论文
First Author:
Qu, Zhenping
Correspondence Author:
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.
Co-author:
Bu, Yibin,Qin, Yuan,Wang, Yi,Fu, Qiang
Date of Publication:
2012-10-15
Journal:
CHEMICAL ENGINEERING JOURNAL
Included Journals:
SCIE、EI、Scopus
Document Type:
J
Volume:
209
Page Number:
163-169
ISSN No.:
1385-8947
Key Words:
Toluene; Mn/SBA-15; K; FTIR; Adsorption sites
Abstract:
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.
Translation or Not:
no
