期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 221, 期 -, 页码 159-166出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2015.09.034
关键词
LaFeO3 perovskite; Porous silica; RhB oxidation; Mechanism; Transport efficiency
类别
资金
- National Science Foundation of China [21203254]
- Science and Technology Activities of Overseas Personnel Preferential Funding Project [BZY14038]
- Natural Science Foundation of Hubei Province of China [2015CFA138]
- National High Technology Research and Development Program of China (863 Program) [2015AA050502]
- Natural Science Fundation of South-Central Univeristy for Nationalities [XTZ15016]
This work aims to investigate the role of silica support in the catalytic oxidation of rhodamine B (RhB) over LaFeO3-Silica composites. Four LaFeO3-Silica composites using mesoporous silica (SBA-15, SBA-16, MCF) and nano-sized silica powder (NSP) as supports are prepared. XRD, N-2 physisorption isotherms and TEM results show that pure LaFeO3 phase, with particle size of 15-20 nm, is prepared and the texture of supports remains unchanged after the deposition of LaFeO3. Catalytic results show that, besides the function to disperse LaFeO3 on the surface, the support plays two important roles in the reaction: one is to absorb RhB from solution to its pores, and the other is to transport RhB from the pores to the active site, both influence the catalytic efficiency. Thus the non-porous NSP with negligible capacity for RhB adsorption is the worst, and the porous MCF with considerable capacity for RhB adsorption and the strongest ability for RhB transportation is the best support of LaFeO3 for RhB oxidation. SBA-15 and SBA-16, although show considerable or even higher capacity for RhB adsorption relative to MCF, their contribution to the reaction is less due to the low efficiency of transporting RhB from the pores to the active site. On these bases, the role of silica support in RhB oxidation conducted over LaFeO3-Silica composite is proposed. (C) 2015 Elsevier Inc. All rights reserved.
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