Silylated MgAl LDHs intercalated with MnO2 nanowires: Highly efficient catalysts for the solvent-free aerobic oxidation of ethylbenzene

被引：66
作者：
Lv, Wenmiao [1 ]
Yang, Lei [1 ]
Fan, Binbin [1 ]
Zhao, Yuan [1 ]
Chen, Yanfeng [1 ]
Lu, Ningyue [1 ]
Li, Ruifeng [2 ]
机构：
[1] Taiyuan Univ Technol, Inst Special Chem, Taiyuan 030024, Peoples R China
[2] Taiyuan Univ Technol, MOE, Key Lab Coal Sci & Technol, Taiyuan 030024, Peoples R China
来源：
CHEMICAL ENGINEERING JOURNAL | 2015年 / 263卷
基金：
中国国家自然科学基金;
关键词：
LDH; Silylated LDHs; Ethylbenzene oxidation; O-2; LAYERED DOUBLE HYDROXIDES; PHASE SELECTIVE OXIDATION; AL HYDROTALCITE; ATM; TOLUENE; DECOMPOSITION; ACETOPHENONE; OZONATION; OXYGEN; ACID;
D O I：
10.1016/j.cej.2014.11.009
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
A novel method for the preparation of silylated MgAl layered double hydroxides (LDHs) intercalated with MnO2 nanowires is presented. The method involves functionalizing the calcined MgAl LDHs (LDOs) with mercaptopropyltrimethoxysilane (MPTS), and then treating the silylated LDOs in the aqueous solution of KMnO4. The results obtained from XRD, FTIR, ICP, XPS and TEM showed that MPTS could be successfully grafted on LDOs via the reaction between -Si(OCH3)(3) groups on the silane and the -OH groups on LDOs. LDOs grafted with MPTS could reconstruct their original layered structure by treating them in the aqueous solution of KMnO4, and in the same time, small amount of MnO4- anions were reduced to MnO2 by the grafted -SH groups on MPTS. The formed small amount MnO2 could further catalyze the decomposition of MnO4- in the interlayers of the reconstructed MgAl LDHs to MnO2. The formed MnO2 was finely dispersed on the LDH support in the form of nanowires (about 1.4 nm in diameter). The MnO2/MgAl-LDH composites prepared by this method exhibited high catalytic activity, stability and reusability in the solvent-free aerobic oxidation of ethylbenzene. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：309 / 316
页数：8
相关论文
共 40 条
[1]   Oxidation of ethylbenzene using some recyclable cobalt nanocatalysts: The role of linker and electrochemical study [J].
Arshadi, M. ;
Ghiaci, M. ;
Ensafi, A. A. ;
Karimi-Maleh, H. ;
Suib, Steven L. .
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2011, 338 (1-2) :71-83
[2]   Highly efficient solvent free oxidation of ethylbenzene using some recyclable catalysts: The role of linker in competency of manganese nanocatalysts [J].
Arshadi, Mohammad ;
Ghiaci, Mehran .
APPLIED CATALYSIS A-GENERAL, 2011, 399 (1-2) :75-86
[3]   SELECTIVE OXIDATION OF HYDROCARBONS WITH O-2 OVER CHROMIUM ALUMINOPHOSPHATE-5 MOLECULAR-SIEVE [J].
CHEN, JD ;
SHELDON, RA .
JOURNAL OF CATALYSIS, 1995, 153 (01) :1-8
[4]   Catalytic asymmetric dihydroxylation of olefins with new catalysts:: The first example of heterogenization of OsO42- by ion-exchange technique [J].
Choudary, BM ;
Chowdari, NS ;
Kantam, ML ;
Raghavan, KV .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2001, 123 (37) :9220-9221
[5]   MnO4-1 exchanged Mg-Al hydrotalcite:: a stable and reusable/environmental-friendly catalyst for selective oxidation by oxygen of ethylbenzene to acetophenone and dipheriylmethane to benzophenone [J].
Choudhary, VR ;
Indurkar, JR ;
Narkhede, VS ;
Jha, R .
JOURNAL OF CATALYSIS, 2004, 227 (01) :257-261
[6]   Facile synthesis of CoAl-LDH/MnO2 hierarchical nanocomposites for high-performance supercapacitors [J].
Diao, Zeng Peng ;
Zhang, Yu Xin ;
Hao, Xiao Dong ;
Wen, Zhong Quan .
CERAMICS INTERNATIONAL, 2014, 40 (01) :2115-2120
[7]   Applications of layered double hydroxides [J].
Feng, L ;
Duan, X .
LAYERED DOUBLE HYDROXIDES, 2006, 119 :193-223
[8]  
Fukuda O, 2001, ADV SYNTH CATAL, V343, P809, DOI 10.1002/1615-4169(20011231)343:8<809::AID-ADSC809>3.0.CO
[9]  
2-1
[10]   Selective oxidation of ethylbenzene with air catalyzed by simple μ-oxo dimeric metalloporphyrins under mild conditions in the absence of additives [J].
Guo, CC ;
Peng, QJ ;
Liu, Q ;
Jiang, GF .
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL, 2003, 192 (1-2) :295-302
1234