期刊
APPLIED CATALYSIS A-GENERAL
卷 393, 期 1-2, 页码 215-224出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcata.2010.12.005
关键词
SBA-3; AISBA-3; NbSBA-3; Modification with Cu; Oxidation of methanol
资金
- Polish Ministry of Science [N N204016539]
Silicate, niobosilicate and aluminosilicate mesoporous sieves of SBA-3 type with hexagonal arrangement of pores were synthesised and modified by the wetness impregnation with copper (1 wt% loading). The physicochemical properties of the samples were investigated by XRD, N-2 adsorption-desorption, XRF, ICP, H-2-TPR, ESR, UV-vis, XPS techniques and in acid-basic test reactions-acetonyloacetone cyclisation, 2-propanol reaction as well as by pyridine adsorption combined with FTIR measurements. The oxidative/dehydrogenation catalytic activity of prepared catalysts was examined in the methanol oxidation reaction. Depending on the chemical composition of the SBA-3 support, various copper species were found to be formed and a range of catalytic activities could be achieved. On SBA-3, AISBA-3 and NbSBA-3 the following copper species were found dominant: bulk CuO, oligonuclear [Cu delta+center dot center dot center dot O delta-center dot center dot center dot Cu delta+](n) clusters and isolated copper cationic species, respectively. Migration of niobium species from the inert part of walls onto the surface after copper loading was observed. The Si/Nb ratio in the support was established to determine the activity and selectivity of Cu modified samples. By the proper combination of the content of Nb and Cu on the surface of SBA-3 materials it can be possible to obtain the catalysts selective to the desired products in oxidation of methanol. The highest production of formaldehyde from methanol was obtained on Cu/NbSBA-3-64 (Si/Nb = 57 in bulk and 43 on the surface, Nb/Cu = 0.8 on the surface). (C) 2010 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据