检索结果-南通市图书馆

NANOSIZED Y2O3 POWDERS MADE BY flame-ASSISTED spray pyrolysis

化工学报 2004年第3期55卷 512-513页

作者：范益群冯君徐南平时钧 Key Laboratory of Materials Oriented Chemical Engineering of Jiangsu Province China Nanjing 210009 College of Chemistry and Chemical Technology Nanjing University of Technology College of Chemistry and Chemical Technology

Nanoparticle synthesis in flame is an attractive and effective method [1]. Nanoparticle can be synthesized in flame by either gas-to-particle conversion or particle-to-particle conversion [2-4]. Since precursors in gas-to-particle conversion must be gases, it is required that the corresponded liquid precursors have high volatility. In comparison with gas-to-particle conversion, precursors in particle-to-particle conversion are less limited, varying from flammable organometallic solutions to various aqueous metal salt solutions such as metal chlorides, metal nitrates and metal acetates. The precursor material is atomized and carried by a gas into the flame. Generally speaking organometallic compounds are more expensive while aqueous metal salt solutions are readily available. Therefore flame spray pyrolysis using aqueous metal salt solutions as precursors has greater advantages.

关键词： nanoparticle premixed flame flame spray pyrolysis yttria

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Effects of cerium incorporation on the catalytic oxidation of benzene over flame-made perovskite La_(1-x)Ce_xMnO_3 catalysts

引用

Particuology 2015年第2期13卷 60-68页

作者： Gang Liu Jiaqi Li Kun Yang Wenxiang Tang Haidi Liu Jun Yang Renliang Yue Yunfa Chen State Key Laboratory of Multi-phase Complex Systems Institute of Process EngineeringChinese Academy of Sciences University of Chinese Academy of Sciences

Perovskite-type La1-xCexMnO3 （x= 0-10%） catalysts were prepared by flame spray pyrolysis and their activities during the catalytic oxidation of benzene were examined over the temperature range of 100-450 ℃. The structural properties and reducibility of these materials were also characterized by X-ray diffraction （XRD）, N2 adsorption/desorption, H2 temperature-programmed reduction （H2-TPR） and X-ray photoelectron spectroscopy （XPS）. The incorporation of Ce was found to improve the benzene oxidation activity, and the perovskite in which x was 0.1 exhibited the highest activity. Phase composition and surface elemental analyses indicated that non-stoichiometric compounds were present. The incorporation of Ce had a negligible effect on the specific surface area of the perovskites and hence this factor has little impact on the catalytic activity. Introduction of Ce^4＋ resulted in modification of the chemical states of both B-site ions and oxygen species and facilitated the reducibility of the perovskite. The surface Mn^4＋/Mn^3＋ ratio was increased as a result of Ce^4＋ substitution, while a decrease in the surface-adsorbed O/lattice O （Oads/Olatt） ratio was observed. The relationship between the surface elemental ratios and catalytic activity was established to allow a better understanding of the process by which benzene is oxidized over perovskites.

关键词： Perovskite Benzene elimination Ce substitution flame spray pyrolysis Charge neutralization

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

TiO2-based materials for photocatalytic hydrogen production

引用

Journal of Energy Chemistry 2017年第2期26卷 250-258页

作者： G.L.Chiarello M.V.Dozzi E.Selli Dipartimento di Chimica Universitàdegli Studi di MilanoVia Golgi 19I-20133 MilanoItaly

Hydrogen, the cleanest and most promising energy vector, can be produced by solar into chemical energy conversion, either by the photocatalytic direct splitting of water into Hand O, or, more efficiently,in the presence of sacrificial reagents, e.g., in the so-called photoreforming of organics. Efficient photocatalytic materials should not only be able to exploit solar radiation to produce electron–hole pairs, but also ensure enough charge separation to allow electron transfer reactions, leading to solar energy driven thermodynamically up-hill processes. Recent achievements of our research group in the development and testing of innovative TiO-based photocatalytic materials are presented here, together with an overview on the mechanistic aspects of water photosplitting and photoreforming of organics. Photocatalytic materials were either（i） obtained by surface modification of commercial photocatalysts, or produced（ii） in powder form by different techniques, including traditional sol gel synthesis, aiming at engineering their electronic structure, and flame spray pyrolysis starting from organic solutions of the precursors, or（iii） in integrated form, to produce photoelectrodes within devices, by radio frequency magnetron sputtering or by electrochemical growth of nanotube architectures, or photocatalytic membranes, by supersonic cluster beam deposition.

关键词： Photocatalytic H2 production Photo steam reforming flame spray pyrolysis Nanotubes Noble metal nanoarticles Photocatalytic devices

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：