已为您找到该学者5条结果 成果回收站
侯文华 , Xueguang Wang, Wenhua Hou, Xiaoshu Wang, Qijie Yan∗
Applied Catalysis B: Environmental 35(2002)185-193,-0001,():
-1年11月30日
A series of silica-pillared layered titanoniobate supported copper catalysts (Cu/Si-TiNbO5) were prepared for the direct decomposition of NO. It was found that Cu/Si-TiNbO5 catalysts were highly active for the reaction of NO (0.1 vol.% in He) decomposition in the space velocity range of 3000–30,000 cm3 g−1 h−1. The 3.5 wt.% Cu/Si-TiNbO5 catalyst showed the highest conversion into N2 for NO decomposition. While 2.0 wt.% Cu/Si-TiNbO5 had the highest specific activity at low temperature (≤550◦C) and 1.0 wt.% Cu/Si-TiNbO5 showed the highest specific activity at high temperature (>550◦C). XRD and temperature-programmed reduction (TPR) results indicated that there existed well-dispersed copper oxide species and large copper oxide particles in the catalysts. Well-dispersed copper oxide species were reduced more easily than large copper oxide particles by H2. X-ray photoelectron spectra (XPS) and Auger electron spectra (AES) results revealed that Cu+ species existed in Cu/Si-TiNbO5 catalysts and that the copper oxide species in Cu/Si-TiNbO5 catalysts after used forNOdecomposition were different from those before the reaction.Well-dispersed copper oxide species were active for NO decomposition and the most active sites might be the dimeric copper oxide species over the support.
NO decomposition, Copper oxide, Layered titanoniobate, Pillaring, Silica
-
46浏览
-
0点赞
-
0收藏
-
0分享
-
176下载
-
0
-
引用
侯文华 , Xianji Guo a, b, Wenhua Hou a, *, Weiping Ding a, Yining Fan a, Qijie Yan a, Yi Chen a
Microporous and Mesoporous Materials 80(2005)269-274,-0001,():
-1年11月30日
A novel well-ordered super-microporous layered material, silica-pillared niobic acid, was synthesized by a guest-exchange route and structurally characterized by powder X-ray diffraction (XRD), infrared absorption spectroscopy (IR), thermogravimetric and differential thermal analysis (TG/DTA), transmission electron micrographs (TEM), nitrogen adsorption method and ammonia-temperature-programmed desorption (NH3-TPD). The obtained silica-pillared layered niobic acid had a supergallery of 1.78 nm, a large BET surface area of 250 m2 g-1, and a high thermal stability exceeding 973 K.The pillared layered material was also found to be an efficient solid acid catalyst for the vapor-phase Beckmann rearrangement of cyclohexanone oxime. When 1-hexanol was fed with cyclohexanone oxime, this solid catalyst exhibited a 100% conversion of the oxime with a selectivity of e-caprolactam beyond 85% at a reaction temperature of 613 K and a WHSV of 0.17 h 1 in terms of cyclohexanone oxime, and there was no significant change of the conversion and selectivity within 6h.
Super-microporous structure, Silica-pillared layered niobic acid, Supergallery, Catalytic activity, Cyclohexanone oxime, Vapor-phase Beckmann rearrangement
-
50浏览
-
0点赞
-
0收藏
-
0分享
-
195下载
-
0
-
引用
【期刊论文】BRIEF COMMUNICATION Synthesis of Porous Chromia-Pillared Tetratitanate
侯文华 , Wenhua Hou, Yashao Chen, Canxiong Guo, and Qijie Yan
JOURNAL OF SOLID STATE CHEMISTRY 136, 320-321 (1998),-0001,():
-1年11月30日
The first chromia-pillared tetratitanate is prepared by the reaction of the layered tetramethylammonium-intercalated tetratitanate with an aqueous chromium (Ⅲ) acetate followed by calcination at 400℃. The new porous material has a specific surface area as high as 94 m2 g21 and an interlayer distance of 1.06 nm along with a moderately strong acidity. The layered nature of the pillared material may be retained above 600℃.
-
47浏览
-
0点赞
-
0收藏
-
0分享
-
104下载
-
0
-
引用
侯文华 , Xianji Guo, Wenhua Hou *, Weiping Ding, Yining Fan, Qijie Yan, Yi Chen
Inorganic Chemistry Communications 7(2004)946-948,-0001,():
-1年11月30日
The intercalation behaviour of titanium(IV) (triethanolaminato)-isopropoxide (abbreviated as TEAIP) in a series of layered protonic metal oxides was investigated. Two novel inorganic-organic hybrid nanocomposites have been obtained.
Titanium(, IV), (, triethanolaminato), -isopropoxide, Intercalation, Layered protonic metal oxides, Inorganic-organic hybrid nanocomposites
-
60浏览
-
0点赞
-
0收藏
-
0分享
-
190下载
-
0
-
引用
侯文华 , Xueguang Wang, Wenhua Hou , Hai Wang, Qijie Yan *
Catalysis Communications 3(2002)275-280,-0001,():
-1年11月30日
A 2 wt% copper catalyst supported on silica-pillared layered niobate (Cu/Si-Nb3O8) with a high hydrothermal stability was prepared and tested for the NO+CO reaction. Pretreatment with water vapor could improve the activity of the catalyst greatly, while the selectivity to N2 almost kept unchanged. The addition of water vapor (2 vol%) into the reaction gas could increase the activities of the catalyst without pretreatment and those pretreated by 2 vol% and 5 vol% stream, but reduce the activity of the catalyst pretreated by up to 10 vol% water vapor. Generally, water vapor in the reaction gas slightly reduced the selectivity to N2.
Silica-pillared layered niobate, Copper oxide, Nitrogen monoxide reduction, Carbon monoxide, Water vapor
-
44浏览
-
0点赞
-
0收藏
-
0分享
-
111下载
-
0
-
引用