The Open Catalysis Journal最新文献_第5页

Dowex-50W-Promoted Synthesis of Oxazoline, Imidazoline and Thiazoline Derivatives~!2009-06-29~!2009-08-26~!2009-12-11~! dowex - 50w催化合成恶唑啉、咪唑啉和噻唑啉衍生物

The Open Catalysis Journal Pub Date : 2010-01-04 DOI: 10.2174/1876214X00902010163

A. Bazgir, M. Amini, Y. Fazaeli

引用次数: 11

Telechelic of Poly (Propylene Oxide) Catalyzed by Maghnite-H+~!2009-05-16~!2009-09-09~!2009-12-31~! 磁铁矿- h +催化聚环氧丙烷的远旋反应

The Open Catalysis Journal Pub Date : 2010-01-04 DOI: 10.2174/1876214X00902010166

M. Benadda, M. I. Ferrahi, N. Sahli, M. Belbachir

引用次数: 0

Effects of ZnO and MoO3 Doping on Surface and Catalytic Properties of Manganese Oxide Supported on Alumina System ZnO和MoO3掺杂对氧化铝负载氧化锰体系表面和催化性能的影响

The Open Catalysis Journal Pub Date : 2010-01-01 DOI: 10.2174/1876214X011040100027

S. M. Ibrahim, G. El-Shobaky, G. M. Mohamed, N. Hassan

{"title":"Effects of ZnO and MoO3 Doping on Surface and Catalytic Properties of Manganese Oxide Supported on Alumina System","authors":"S. M. Ibrahim, G. El-Shobaky, G. M. Mohamed, N. Hassan","doi":"10.2174/1876214X011040100027","DOIUrl":"https://doi.org/10.2174/1876214X011040100027","url":null,"abstract":"Mn2O3/Al2O3 system was prepared by the impregnation method using finely powdered Al(OH)3 and a calculated amount of Mn(NO3)2 dissolved in the smallest amount of distilled water followed by drying and calcination at 400-600°C. Six doped solids were prepared by impregnating powdered Al(OH)3 Solids with different amounts of Zn(NO3)2 or (NH4)6Mo7O24.4H2O followed by drying, then impregnating with Mn(NO3)2. The doped solids were calcined at 400-600°C. The dopant concentrations were 0.75, 1.5, and 3 mol% ZnO or MoO3. The structural characteristics, surface and the catalytic properties of pure and variously doped solids were examined by using XRD, N2 adsorption at- 196°C and isopropanol conversion carried out at 140-280°C using a flow technique under atmospheric pressure. The obtained results revealed that the pure solids investigated and those doped with 0.75 and 1.5mol% ZnO or MoO3 calcined at 500°C, consisted of a mixture of nanosized MnO2 (Pyrolusite) and Mn2O3 (Partridgeite phase) together with � -Al2O3. Increasing the calcination temperature of the variously doped solids to 600°C led to the complete conversion MnO2(Pyrolusite) to nanosized Mn2O3 (Partridgeite phase). The crystallite size of manganese oxide phases varied between 3 and 56 nm. All surface characteristics of the system investigated were much affected by calcination temperature and dopant concentration. Isopropanol conversion carried out over pure and doped system calcined at different temperatures proceeded via dehydration and dehydrogenation yielding propene and acetone, respectively. The activity and selectivity of the various solids were much affected by the reaction temperature, calcination temperature and dopant concentration.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"2002 1","pages":"27-35"},"PeriodicalIF":0.0,"publicationDate":"2010-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88358051","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

Effect of K Addition and Acidification of Zeolite Support on the Performance of Zr:Mo/Hzsm-5 Modified Catalyst in Methane Aromatization 添加K和沸石载体酸化对Zr:Mo/Hzsm-5改性甲烷芳构化催化剂性能的影响

The Open Catalysis Journal Pub Date : 2010-01-01 DOI: 10.2174/1876214X011040100036

S. Hussain, Ghazala Hasan

引用次数: 2

Selective Gas-Phase Conversion of Glycerol to Acetol Over Promoted Zirconia Solid Acid Catalysts 氧化锆固体酸催化剂上甘油选择性气相转化为丙酮的研究

The Open Catalysis Journal Pub Date : 2010-01-01 DOI: 10.2174/1876214X01104010059

G. Raju, P. S. Reddy, B. M. Reddy

引用次数: 2

New Extra Large Pore Chromium Oxophenylphosphate: An Efficient Catalyst in Liquid Phase Partial Oxidation Reactions 新型超大孔径磷酸氧苯铬:液相部分氧化反应的高效催化剂

The Open Catalysis Journal Pub Date : 2009-12-09 DOI: 10.2174/1876214X00902010156

Pal Nabanita, Paul Manidipa, Bhaumik Asim

引用次数: 1

A New and Facile Preparation of Optically Active Endo-Bicyclo (n,1,0) Hex(Hept)An-2-Ols by In Vitro Enzyme Catalysis 体外酶催化制备光活性内切双环(n,1,0)己烯(Hept) an -2-醇的新方法

The Open Catalysis Journal Pub Date : 2009-10-01 DOI: 10.2174/1876214X00902010150

Halaïmia Farhi, Kettouche Hichem Sadrik, Djerourou Abdel Hafid

引用次数: 0

Osmium(VIII) Catalysed Oxidation of Diclofenac Sodium by Diperiodatoargentate( III) Complex in Aqueous Alkaline Medium 在碱性水溶液中，锇(VIII)催化双氯芬酸钠被双periodatoargentate(III)络合物氧化

The Open Catalysis Journal Pub Date : 2009-09-10 DOI: 10.2174/1876214X00902010140

H. PatilRoopa, N. NaikPraveen, T. NandibewoorSharanappa

{"title":"Osmium(VIII) Catalysed Oxidation of Diclofenac Sodium by Diperiodatoargentate( III) Complex in Aqueous Alkaline Medium","authors":"H. PatilRoopa, N. NaikPraveen, T. NandibewoorSharanappa","doi":"10.2174/1876214X00902010140","DOIUrl":"https://doi.org/10.2174/1876214X00902010140","url":null,"abstract":"The kinetics of Osmium(VIII) (Os(VIII)) catalysed oxidation of diclofenac sodium (DFS) by diperiodatoargentate(III) (DPA) in alkaline medium at a constant ionic strength of 0.60 mol dm -3 has been studied spectrophotometrically. The stoichiometry was found to be 1:1 i.e, one mole of DFS reacted with one mole of DPA. The reaction was first order with respect to (DPA) and (Os(VIII)), less than unit order in both (DFS) and (alkali) and negative fractional order in (periodate). The effect of added products, ionic strength and dielectric constant of the medium was studied. The oxidation reaction in alkaline medium has been shown to proceed via a Os(VIII)-DFS complex, which further reacts with one molecule of monoperiodatoargentate in a rate determining step followed by other fast steps to give the products. The oxidation products were identified by LC-ESI-MS, NMR and IR spectral studies. The reaction constants involved in different steps of the mechanism were calculated. The activation parameters with respect to slow step of the mechanism were computed and discussed and thermodynamic quantities were also determined. The catalytic constant (Kc) was also calculated for Os(VIII) catalysis at different temperatures and values of activation parameters with respect to the catalyst have been evaluated. The active species of catalyst and oxidant have been identified.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"4 1","pages":"140-149"},"PeriodicalIF":0.0,"publicationDate":"2009-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79270181","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: 0

Surface and Catalytic Properties of Nanocrystalline Pure and Li2O - Doped CoO/Mn2O3 System 纳米晶纯和掺Li2O CoO/Mn2O3体系的表面和催化性能

The Open Catalysis Journal Pub Date : 2009-07-03 DOI: 10.2174/1876214X00902010119

G. El-Shobaky, M. Shouman, S. M. Ibrahim

{"title":"Surface and Catalytic Properties of Nanocrystalline Pure and Li2O - Doped CoO/Mn2O3 System","authors":"G. El-Shobaky, M. Shouman, S. M. Ibrahim","doi":"10.2174/1876214X00902010119","DOIUrl":"https://doi.org/10.2174/1876214X00902010119","url":null,"abstract":"The effects of calcination temperature (350 - 700°C) and Li2O - doping (0.75 - 4.5 mol%) on solid - solid inter- action, surface and catalytic properties of CoO/Mn2O3 were investigated using XRD, N2 adsorption at -196oC and isopro- panol conversion carried out at 180 - 280°C using a flow method. The results obtained revealed that solid - solid interac- tion between pure and doped - solids took place at temperatures starting from 350°C to yield cobalt manganese oxide (Co, Mn) (Co,Mn)2O4 phase. The degree of crystallinity and crystallite size of the produced phase increased progressively as a function of calcination temperature but still remained as nanocrystalline phase 15 - 33 nm. Li2O - doping of the system in- vestigated decreased the crystallite size of the produced phase. The doping process decreased the specific surface area of the system investigated, the decrease attained 33% and 32% in presence of 4.5 mol% Li2O in solids calcined at 500 and 700oC, respectively. Li2O - doping exerted an effective increase in total pore volume, the increase reached 57% and 27% by doping with 4.5 mol% Li2O followed by calcination at 500 and 700, respectively. Pure system showed a broad pore volume distribution while the doped solids exhibited multimodal pore volume distribution curves. Pure and variously doped solids acted as dehydrogenation catalysts yielding only acetone. The activity increased by increasing the calcina- tions temperature from 350°C to 400°C, then decreased upon increasing the calcinations temperature above this limit. The doping process carried out at 500°C and 700°C much increased the catalytic activity. The maximum increase in the cata- lytic activity, measured at 280°C, in presence of 4.5 mol% Li2O attained 45 and 94% for the solids calcined at 500°C and 700°C, respectively. The increase in calcination temperature within 350°C and 700°C and doping with different amounts of Li2O did not change the mechanism of the catalyzed reaction.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"65 1 1","pages":"119-129"},"PeriodicalIF":0.0,"publicationDate":"2009-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86731405","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: 2

Mechanistic Investigations of Ruthenium(III) Catalyzed Oxidation of L-Tryptophan by Diperiodatocuprate(III) in Aqueous Alkaline Media (Stopped Flow Technique): A Kinetic Study 双periodatocuate (III)在碱性水介质中催化氧化l -色氨酸的机理研究(停流技术):动力学研究

The Open Catalysis Journal Pub Date : 2009-07-03 DOI: 10.2174/1876214X00902010130

N. Shetti, R. R. Hosamani, S. Nandibewoor

{"title":"Mechanistic Investigations of Ruthenium(III) Catalyzed Oxidation of L-Tryptophan by Diperiodatocuprate(III) in Aqueous Alkaline Media (Stopped Flow Technique): A Kinetic Study","authors":"N. Shetti, R. R. Hosamani, S. Nandibewoor","doi":"10.2174/1876214X00902010130","DOIUrl":"https://doi.org/10.2174/1876214X00902010130","url":null,"abstract":"The kinetics of the oxidation of ruthenium(III) (Ru(III)) catalyzed oxidation of L-tryptophan (L-trp) by diperiodatocuprate(III) (DPC) in aqueous alkaline medium at a constant ionic strength of 0.20 mol dm -3 was studied spectrophotometrically. The reaction between L-tryptophan and DPC in alkaline medium in presence of (Ru(III)) exhibits 1:4 stoichiometry (L-trp:DPC). The reaction was of first order in (DPC), less than unit order in (L-trp) and negative fractional order in both (OH - ) and (IO4 - ). The order in (Ru(III)) was unity. Intervention of free radicals was observed in the reaction. The oxidation reaction in alkaline medium has been shown to proceed via a Ru(III)-L-trp complex, which reacts with monoperiodatocuprate(III) to decompose in a rate determining step followed by other fast steps to give the products. The main products were identified by spot test, IR, NMR and LC-MS. Probable mechanism is proposed and discussed. The activation parameters with respect to the slow step of the mechanism were computed and discussed and thermodynamic quantities were also calculated. The active species of catalyst and oxidant have been identified.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"21 1","pages":"130-139"},"PeriodicalIF":0.0,"publicationDate":"2009-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82663787","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: 9