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	MCM41 and silica supported MoVTe mixed oxide catalysts for direct oxidation of propane to acrolein
	Luqian Chen ; Jun Liang ; Hong Lin ; Weizheng Weng ; Weng WZ(翁维正) ; Huilin Wan ; Wan HL(万惠霖) ; Jacques. C. Ve´drine
	2005-08
关键词	silica catalysts bulk Mo1.3V0.3Te0.3 mixed oxide MCM41 supported Mo1.3V0.3Te0.3 mixed oxide catalysts propane direct oxidation acrolein
英文摘要	Bulk Mo1.3V0.3Te0.3 mixed oxide and MCM41 and amorphous silica supported Mo13V0.3Te0.3 mixed oxide (3 and 8 mol%, i.e. 6 and 15% monolayer coverage on MCM41 and 19 and 51% monolayer coverage on silica, respectively) catalysts have been synthesized and studied for direct oxidation of propane (DOP) to acrolein (ACR). After calcination at 853 K for 2 h under flowing nitrogen, characterization results (XRD, Raman and TEM-EDX) show that Mo species, MoV, MoTe and We mixed oxides with various compositions are present in the samples before and after testing, but after testing the EDX analyses indicate more domains rich in Mo when using a narrow electron beam (circle divide similar to 5-10 nm in size), particularly for bulk and 8 mol% supported samples. At variance, broad electron beam (circle divide similar to 50-100 nm in size) EDX analyses give values close to chemical compositions. This shows that under catalytic conditions, solid-state reaction has occurred leading to restructuring of several phases present in the samples, with extraction of some volatile MoO3. Catalytic study at reaction temperature 773 K shows that amorphous silica and MCM41 supports exhibit catalytic activity in DOP to ACR, respectively. This means that homogeneous reaction occurs in the gas phase under the studied conditions after initiation on the solid surface. M0.3V0.3Te0.3 mixed oxide is shown to be highly dispersed on MCM41 and silica supports, particularly for low mixed oxide content (3 mol%) leading to higher selectivity and yield in ACR obtained than that for bulk samples, in particular for MCM41 support. This is indicated to arise from a better dispersion of the active phases, which favors redox properties of the catalytic materials and prevents deep oxidation of propane. (c) 2005 Elsevier B.V. All rights reserved.
语种	英语
出版者	ELSEVIER SCIENCE BV
内容类型	期刊论文
源URL	[http://dx.doi.org/doi:10.1016/j.apcata.2005.06.029]
专题	化学化工－已发表论文
推荐引用方式 GB/T 7714	Luqian Chen,Jun Liang,Hong Lin,et al. MCM41 and silica supported MoVTe mixed oxide catalysts for direct oxidation of propane to acrolein[J],2005.
APA	Luqian Chen.,Jun Liang.,Hong Lin.,Weizheng Weng.,翁维正.,...&Jacques. C. Ve´drine.(2005).MCM41 and silica supported MoVTe mixed oxide catalysts for direct oxidation of propane to acrolein..
MLA	Luqian Chen,et al."MCM41 and silica supported MoVTe mixed oxide catalysts for direct oxidation of propane to acrolein".(2005).

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