The Open Catalysis Journal最新文献_第2页

Direct Synthesis of 2D-Hexagonal Mesoporous Iron Silicate and its Catalytic Activity for Selective Friedel-Crafts Alkylation 二维六方介孔硅酸铁的直接合成及其选择性Friedel-Crafts烷基化的催化活性

The Open Catalysis Journal Pub Date : 2012-11-01 DOI: 10.2174/1876214X01205010056

Swapan Das, M. Bhunia, A. Bhaumik

{"title":"Direct Synthesis of 2D-Hexagonal Mesoporous Iron Silicate and its Catalytic Activity for Selective Friedel-Crafts Alkylation","authors":"Swapan Das, M. Bhunia, A. Bhaumik","doi":"10.2174/1876214X01205010056","DOIUrl":"https://doi.org/10.2174/1876214X01205010056","url":null,"abstract":"D-hexagonal mesoporous iron silicate (HMFeS) has been synthesized hydrothermally in the presence of a mixture of an amphiphilic triblock copolymer, pluronic F127 and 1,2,4-trivinylcyclohexane (TVCH) as swelling agent under acidic aqueous conditions. The direct incorporation of iron(III) into 2D-hexagonal silicate framework can be monitored in a optimized molar ratio of water and hydrochloric acid. The mesophase of the materials was investigated by using small-angle powder X-ray diffractions (PXRD), transmission electron microscopy (TEM) image analysis and nitrogen adsorption/desorption studies. TEM image and PXRD revealed that the material had 2D-hexagonal mesoporous architecture. The morphology of the material was investigated by using scanning electron microscope (SEM) and framework bonding by utilizing FT IR spectroscopy. The atomic absorption spectrophotometer (AAS) was used to estimate the incorporated iron sites within the silicate framework. BET surface area (780 m 2 g -1 ) and peak pore size of HMFeS (10.07 nm) is much higher than the pure silica SBA-15 (611 m 2 g -1 and peak pore size of 9.09 nm). This mesoporous material (HMFeS) acts as a very good catalyst in the Friedel Craft benzylation and benzoylation reactions of arenes under optimized reaction condition using benzyl chloride and benzoyl chloride as the bezylating and benzoylating agents, respectively.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"5 1","pages":"56-65"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88101969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

TiO2-ZrO2 Binary Oxides for Effective Hydrodesulfurization Catalysts 用于加氢脱硫的TiO2-ZrO2二元氧化物催化剂

The Open Catalysis Journal Pub Date : 2012-09-07 DOI: 10.2174/1876214X01205010031

R. Tiwari, B. Rana, R. Kumar, A. Sinha

引用次数: 7

Cu-S Coped TiO 2 NanoPhotocatalyst for the Degradation of Environmental and Industrial Pollutants Cu-S Coped二氧化钛纳米光催化剂降解环境和工业污染物

The Open Catalysis Journal Pub Date : 2012-07-05 DOI: 10.2174/1876214X01205010021

M. Mazhar, A. Siddiqa, H. Javid, M. Siddiq

{"title":"Cu-S Coped TiO 2 NanoPhotocatalyst for the Degradation of Environmental and Industrial Pollutants","authors":"M. Mazhar, A. Siddiqa, H. Javid, M. Siddiq","doi":"10.2174/1876214X01205010021","DOIUrl":"https://doi.org/10.2174/1876214X01205010021","url":null,"abstract":"Sulfur doped titanium dioxide anatase nano-photocatalyst with different copper loadings (5, 10, 15, and 20 w/w %) was synthesized by hydrothermal method. The fabricated nanocatalysts were found to have high surface area, high aspect ratio, good surface morphology and high metals dispersion. The synthesized nanocatalysts were characterized by X-ray powder diffraction (XRD), Scanning electron microscopy (SEM), Diffuse reflectance spectroscopy (DRS), Fourier transform infrared spectroscopy (FTIR), Energy dispersive X-ray (EDX), Brunauer Emmett teller method (BET). The results revealed that photocatalyst possesses anatase phase having particle size in the range of 9 to 12nm. The band gap of the photocatalyst was determined using transformed diffuse reflectance spectroscopy according to the Kubelka-Munk theory, showed prominent band gap decrease with increase in the Cu loadings. The photocatalytic activity of S-TiO2 and copper loaded S-TiO2 nanocatalyst were determined for degradation of phenol into hydrocarbons (methane, ethene, and propene) and photo reduction of CO2 into ethanol. The activity results revealed that degradation of phenol and photoreduction of CO2 increased with increasing copper loadings, due to creation of electronically modified active sites and change in the electron accepting properties of TiO2 with Cu addition and creation of electron hole pair.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"55 1","pages":"21-30"},"PeriodicalIF":0.0,"publicationDate":"2012-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90436522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 19

Oxidation of Cyclohexane by Transition Metal Oxides on Zeolites 沸石上过渡金属氧化物氧化环己烷的研究

The Open Catalysis Journal Pub Date : 2012-02-22 DOI: 10.2174/1876214X01205010008

Christopher Riley

引用次数: 10

Oxidation of Vicinal Diols by Cerium(IV) in Aqueous Acidic Media Catalyzed by Rhodium(III) 铑(III)催化铈(IV)在酸性水介质中氧化邻二醇

The Open Catalysis Journal Pub Date : 2012-01-16 DOI: 10.2174/1876214X01205010001

P. Tandon, Shaista Z. Khanam, S. Singh

{"title":"Oxidation of Vicinal Diols by Cerium(IV) in Aqueous Acidic Media Catalyzed by Rhodium(III)","authors":"P. Tandon, Shaista Z. Khanam, S. Singh","doi":"10.2174/1876214X01205010001","DOIUrl":"https://doi.org/10.2174/1876214X01205010001","url":null,"abstract":"Potential of rhodium(III) chloride in catalyzing, in aqueous sulfuric acid medium, the oxidation of vicinal diols, and the kinetics of reaction of cerium(IV) with propane-1,2-diol and butane-2,3-diol catalyzed by rhodium(III) chloride was investigated. Data show that the reactions follow first order kinetics with respect to low cerium(IV) for lower concentrations, but a further increase in the oxidant concentration retards the reaction velocity. The reaction rate shows direct proportionality with respect to low concentrations of diol, which tends to become zero order at higher concentrations of the organic substrate. The Rate is first order in catalyst. Increase in the concentrations of hydrogen and cerium(III) ions show retarding effects while increase in chloride ion concentration and in turn ionic strength of the medium has a positive effect on the rate. Stoichiometry and spectral studies confirmed the formation of one molecule each of formaldehyde and acetaldehyde and two molecules of acetaldehyde as the products of oxidation in case of propane-1,2- diol and butane-2,3-diol respectively. Thermodynamic parameters like enthalpy of activation, free energy of activation and entropy values were calculated and it was found that the formation of activated complex in the case of butane-2,3-diol was easy compared to that in the case of propane-1,2-diol.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"2 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2012-01-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85611511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Stable Continuous Operation of a Biphasic Enantioselective Enzymatic Reduction 双相对映选择性酶还原的稳定连续操作

The Open Catalysis Journal Pub Date : 2011-11-04 DOI: 10.2174/1876214X01104010113

P. Müller, Benjamin L. Bangasser, L. Greiner, Shukrallah Na’amnieh, P. Bäuerlein, D. Vogt, C. Müller

引用次数: 8

Catalytic Asymmetric Addition of Diethylzinc to Benzaldehyde Using α- Pinene-Derived Ligands 用α-蒎烯衍生配体催化二乙基锌与苯甲醛的不对称加成

The Open Catalysis Journal Pub Date : 2011-09-12 DOI: 10.2174/1876214X01104010107

E. Koneva, E. V. Suslov, D. Korchagina, A. Genaev, K. Volcho, N. Salakhutdinov

引用次数: 7

Preparation of Nanostructured Pd-C-Ru Composite Electrodes for Alcohol Electrooxidations. Part-I: A Study of Ethanol Oxidation by Cyclic Voltammetry and Impedance Spectroscopy 乙醇电氧化用纳米结构Pd-C-Ru复合电极的制备第一部分:用循环伏安法和阻抗法研究乙醇氧化

The Open Catalysis Journal Pub Date : 2011-05-16 DOI: 10.2174/1876214X01104010088

Anindita, R. Awasthi, Madhu, R. Singh

引用次数: 13

A Study on Control of Microorganisms in Drinking Water Using Ag-Cu/C Catalysts Ag-Cu/C催化剂控制饮用水中微生物的研究

The Open Catalysis Journal Pub Date : 2011-04-14 DOI: 10.2174/1876214X01104010047

K. H. Reddy, V. Shashikala, N. Anand, C. Sandeep, B. D. Raju, K. R. Rao

引用次数: 5

Non-Metal and Enzymatic Catalysts for Hydroperoxide Oxidation of Organic Compounds 有机化合物氢过氧化氧化的非金属和酶催化剂

The Open Catalysis Journal Pub Date : 2011-04-14 DOI: 10.2174/1876214X01104010054

J. Młochowski, W. Peczyńska‐Czoch, Magdalena Pįętka-Ottlik, Halina Wójtowicz-Młochowska

引用次数: 26