A two-step synthesis of Fe-substituted hexaaluminates with enhanced surface area and activity in methane catalytic combustion

doi:10.1039/c5cy02187a

	A two-step synthesis of Fe-substituted hexaaluminates with enhanced surface area and activity in methane catalytic combustion
	Huang, Fei 1,2; Wang, Xiaodong 1; Wang, Aiqin 1; Xu, Jinming 1; Zhang, Tao 1
刊名	CATALYSIS SCIENCE & TECHNOLOGY
	2016
卷号	6 期号:13 页码:4962-4969
ISSN号	2044-4753
DOI	10.1039/c5cy02187a
文献子类	Article
英文摘要	Hexaaluminates have been regarded as one of the most promising candidates for methane catalytic combustion due to their superior thermal stability up to 1600 degrees C. However, the main challenge for their further application lies in the difficulty in enhancing the surface area. Herein, Fe-substituted hexaaluminates (LaFexAl12-xO19, x = 0-2) with high surface areas (44-51 m(2) g(-1)) have been successfully synthesized via a new two-step method for the first time, in which N,N-dimethylformamide (DMF) was used as a difunctional solvent to derive the precipitant dimethylamine and to control the precipitation rates of the three metal cations, leading to superior homogeneity of the precipitate and thus lowering of the phase formation temperature (lower than 1100 degrees C), and the resin/ carbon coating process was employed to separate the crystallization and grain-growth process, avoiding the aggregation of particles. Methane catalytic combustion tests revealed that both the high surface area and the introduction of Fe could result in low apparent activation energy. The LaFeAl11O19 catalyst exhibited even higher activity than the conventional Pd/Al2O3 catalyst and those prepared by other methods such as the reverse microemulsion method. Mossbauer spectroscopy characterization verified that the catalytic activity of Fe cations should be related to the Fe3+ ions in Al(3) sites and Al(5) sites in the mirror planes.
WOS关键词	BARIUM HEXAALUMINATE ; CRYSTALLOGRAPHIC SITES ; CRYSTAL-STRUCTURE ; MEDIATED SYNTHESIS ; OXYGEN-TRANSFER ; OXIDATION ; MN ; DECOMPOSITION ; OXIDES ; N2O
WOS研究方向	Chemistry
语种	英语
出版者	ROYAL SOC CHEMISTRY
WOS记录号	WOS:000378734700036
内容类型	期刊论文
源URL	[http://cas-ir.dicp.ac.cn/handle/321008/170430]
专题	大连化学物理研究所_中国科学院大连化学物理研究所
通讯作者	Wang, Xiaodong
作者单位	1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Huang, Fei,Wang, Xiaodong,Wang, Aiqin,et al. A two-step synthesis of Fe-substituted hexaaluminates with enhanced surface area and activity in methane catalytic combustion[J]. CATALYSIS SCIENCE & TECHNOLOGY,2016,6(13):4962-4969.
APA	Huang, Fei,Wang, Xiaodong,Wang, Aiqin,Xu, Jinming,&Zhang, Tao.(2016).A two-step synthesis of Fe-substituted hexaaluminates with enhanced surface area and activity in methane catalytic combustion.CATALYSIS SCIENCE & TECHNOLOGY,6(13),4962-4969.
MLA	Huang, Fei,et al."A two-step synthesis of Fe-substituted hexaaluminates with enhanced surface area and activity in methane catalytic combustion".CATALYSIS SCIENCE & TECHNOLOGY 6.13(2016):4962-4969.