检索结果-南通市图书馆

Dehydration of fructose and glucose to 5-hydroxymethylfurfural over Al-KCC-1 silica

Journal of Energy Chemistry 2018年第3期27卷 769-780页

作者： Fereshte Shahangi alireza najafi chermahini Mohammad Saraji Department of Chemistry Isfalzan University of Technology84154-83111Isfahan.Iran

In this research, the influence of several factors such as reaction time, catalyst weight, temperature and different solvents on dehydration reaction of fructose and glucose to 5-hydroxymethylfurfural（HMF） was surveyed. Nanosphere Al-KCC-1 silica with fibrous morphology was manufactured and used as proficient and recyclable catalyst for this reaction. SEM, TEM, BET, XRD, EDX, elemental mapping, ICP and FT-IR spectroscopy methods were applied for characterization of the Al-KCC-1（molar ratio Si/Al = 5, 40） catalysts. 162℃ and 1 h are the best conditions for the fructose dehydration. Under this situation HMF yield and selectivity are 92.9% and 94.5% respectively and fructose conversion is 98.4%. Also 170℃ and 2 h are the best conditions for the glucose dehydration. In this situation HMF yield and selectivity are 39.0% and39.9% respectively and glucose conversion is 97.8%.

关键词： Glucose Fructose HMF production Al-KCC-1 Dehydration of carbohydrates

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

Direct production of hydrogen peroxide over bimetallic CoPd catalysts:Investigation of the effect of Co addition and calcination temperature

引用

Green Energy & Environment 2023年第1期8卷 246-257页

作者： Hamidreza Nazeri alireza najafi chermahini Zahra Mohammadbagheri Mirko Prato Department of Chemistry Isfahan University of Technology84154-83111IsfahanIran Materials Characterization Facility Istituto Italiano di TecnologiaVia Morego 3016163GenovaItaly

A series of CoPd/KIT-6 bimetallic catalysts with various Co:Pd molar ratios at different calcination temperatures were prepared and used for the direct synthesis of H_(2)O_(2) from H_(2) and O_(2).These catalysts were characterized by nitrogen adsorption-desorption,low and wide-angle X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS),transmission electron microscopy(TEM),scanning electron microscopy(SEM),elemental mapping and energy-dispersive X-ray(EDX)*** was found that the particle size,electronic interactions,morphology,and textural properties of these catalysts as well as their catalytic activity in the reaction of H_(2) with O_(2) were affected by Co addition and different calcination ***,the results showed that while the H_(2)O_(2) selectivity depends on Pd^(2+) species,the H_(2) conversion is related to Pd0 active *** these catalysts,CoPd/KIT-6 calcined at 350℃(CoPd/KIT-350 catalyst)showed the best catalytic activity with 50%of H_(2)O_(2) selectivity and 51%conversion of H_(2).

关键词： Direct synthesis of hydrogen peroxide Co/Pd catalysts Selectivity The oxidation state of Pd Reusability

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

Synthesis of mono and bis-4-methylpiperidiniummethyl-urea as corrosion inhibitors for steel in acidic media

引用

Frontiers of Chemical Science and Engineering 2011年第1期5卷 43-50页

作者： Abbas TEIMOURI Nasrin SOLTANI alireza najafi chermahini Department of Chemistry Payame Noor University(PNU)Isfahan 81395-671Iran Department of Chemistry Payame Noor University(PNU)Shahin Shahr BranchIsfahan 83196Iran Department of Chemistry Yasouj UniversityYasouj 75918-74831Iran

Mono and bis-4-methylpiperidiniummethyl urea were synthesized,characterized and used as new corrosion inhibitors of mild steel in the acidic *** effect of two compounds on mild steel surface in the 1 mol·L^(–1 )sulphuric acid has been studied by a series of techniques,such as potentiodynamic polarization,weight loss and quantum chemical calculation *** polarization measurements showed that two inhibitors are mixed *** measurements showed that inhibition efficiencies enhanced with increase of inhibitor *** reveals that inhibitive actions of inhibitors were mainly due to adsorption on mild steel *** functional(DFT)calculations have been carried out for the title compounds by performing HF and DFT levels of theory using the standard 6-31G*basis set.

关键词： corrosion inhibitors mild steel acidic medium theoretical studies DFT

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

New tetrazole-based organic dyes for dye-sensitized solar cells

引用

Journal of Energy Chemistry 2015年第6期24卷 770-778页

作者： Zahra Jafari chermahini alireza najafi chermahini Hossein A Dabbagh Abbas Teimouri Department of Chemistry Isfahan University of Technology Chemistry Department Payame Noor University (PNU)

A series of new metal-free organic dyes that contain donors with triphenylamine or its derivatives and tetrazole-based acceptors were synthesized and characterized by photophysical, electrochemical, and the- oretical computational methods. They were applied in nanocrystalline TiO2 solar cells （DSSCs）. It is found that the introduction of diphenylamine units as antennas in the as-synthesized dyes could improve photo- voltaic performance compared with phenothiazine and carbazole units as antennas in DSSCs. The dye with （2H-tetrazol-5-yl） acrylonitrile electron acceptor also displayed the highest solar-to-electrical energy conver- sion efficiency.

关键词： Tetrazole Dye sensitized solar cells DFT Synthesis Anchoring group

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

One-pot Green Synthesis of Pyrrole Derivatives Catalyzed by Nano Sulfated Zirconia as a Solid Acid Catalyst

引用

Chinese Journal of Chemistry 2012年第2期30卷 372-376页

作者： Teimouri, Abbas chermahini, alireza najafi Chemistry Department Payame Noor University 19395-4697 Tehran Iran Department of Chemistry Faculty of Science Yasouj University Yasouj P.O. Box 75918-671671 Iran

A new and efficient method for the preparation of N-substituted pyrroles from one-pot Paal-Knorr condensation has been accomplished using nano-crystalline sulfated zirconia （SZ） as the catalyst in ethanol at moderate temperature. This new protocol has the advantages of easy availability, stability, reusability and eco-friendliness of the catalyst, high to excellent yields, simple experimental and work-up procedure. The synthesized compounds were confirmed through spectral characterization using IR, 1H NMR, 13C NMR and mass spectra.

关键词： sulfated zirconia green synthesis pyrrole Paal-Knorr condensation

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

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

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

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：