The Open Catalysis Journal最新文献

{"title":"Influence of Solvent on the Pore Structure and Activity of Pt-Sn/Alumino- Silicate Catalysts","authors":"M. Riad, S. Mikhail","doi":"10.2174/1876214X00902010110","DOIUrl":"https://doi.org/10.2174/1876214X00902010110","url":null,"abstract":"Kaolinite supported bimetallic Pt-Sn catalysts were prepared via impregnation technique using different sol- vents, water, ethanol and acetone. The catalysts were characterized by X-ray diffraction pattern and temperature pro- grammed reduction techniques. Surface area and pore size distribution were determined by nitrogen physisorption tech- nique. The activities of the catalysts were measured toward n-pentane isomerization reaction in a pulse micro-catalytic re- actor operated under atmospheric pressure and at reaction temperature ranged from 200-450 o C. The results indicated that the selectivity of the Pt-Sn/kaolinite catalysts toward iso-pentane formation decreased from ethanol to acetone and then to water. Pore size distribution and diffusion coefficient of reactant and products are responsible for the high selectivity of Pt-Sn /kaolinte (ethanol) catalyst towards iso-pentane formation.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"32 1","pages":"110-118"},"PeriodicalIF":0.0,"publicationDate":"2009-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86093432","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}

{"title":"Positive Effects of Ionic Liquids in the Oxidative Cleavage of vic-diols Catalyzed by Mn(III) Complexes","authors":"D. Fernández, S. Riaño, L. Fadini","doi":"10.2174/1876214X00902010101","DOIUrl":"https://doi.org/10.2174/1876214X00902010101","url":null,"abstract":"The obtaining of aldehydes or ketones through oxidative cleavage of vicinal diols requires the use of a catalyst. In this work we present the positive effects of ionic liquids in the homogeneous oxidative cleavage of ethylenglycol, pinacol, benzopinacol and hydrobenzoin, catalyzed by Mn(salen) complexes. The catalyst dissolved in ionic liquids allows high efficiency (yield up to 99% with air as oxidant), low environmental impact and, in addition, it is possible to recycle. In order to understand the role of the catalyst and of the ionic liquids, DFT studies were performed and a possible catalytic cycle is presented.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"12 1","pages":"101-109"},"PeriodicalIF":0.0,"publicationDate":"2009-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86485713","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}

{"title":"A New Method for the Preparation of Oxazaborolidine Catalyst In Situ Using 1,2-Aminoalcohol, Sodium Borohydride, and Diiodomethane for the Asymmetric Reduction of Prochiral Ketones and N-Substituted Imines","authors":"Kettouche Hichem Sadrik, Djerourou Abdel Hafid","doi":"10.2174/1876214X00902010096","DOIUrl":"https://doi.org/10.2174/1876214X00902010096","url":null,"abstract":"An oxazaborolidine catalyst is readily prepared in situ at room temperature in THF using 1,2-aminoalcohols and borane generated from sodium borohydride/CH2I2 reagent system. The oxazaborolidine/BH3 reagent system prepared in this way is useful for the reduction of prochiral ketones and N-substituted imines to the corresponding alcohols and amines with moderate to good enantiomeric excesses.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"10 1","pages":"96-100"},"PeriodicalIF":0.0,"publicationDate":"2009-06-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72797523","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}

{"title":"Microwave Polyol Synthesis of Pt/C Catalyst and its Application to Hydrolysis of Sodium Borohydride","authors":"Dongyan Xu, Haizhen Wang, P. Dai, Qingguo Ye","doi":"10.2174/1876214X00902010092","DOIUrl":"https://doi.org/10.2174/1876214X00902010092","url":null,"abstract":"XC-72 carbon supported Pt catalyst was prepared by using a microwave heated ethylene glycol method and characterized by transmission electron microscopy (TEM) and X-ray diffraction (XRD). For comparison, the same Pt/XC- 72 catalyst was also prepared by conventional heated ethylene glycol method. TEM image showed that microwave syn- thesized Pt nanoparticles were uniformly dispersed on the surface of carbon and had a narrow size distribution. The aver- age particle sizes of Pt nanoparticles synthesized with microwave irradiation and conventional heating method are 2.7 and 3.7 nm, respectively. The Pt/C catalysts exhibited four diffraction peaks that are indexed to the {1 1 1}, {2 0 0}, {2 2 0}, and {3 1 1} planes of Pt. Their catalytic performances were evaluated by hydrolysis of sodium borohydride. The micro- wave synthesized Pt/XC-72 catalyst exhibited higher catalytic activity than that synthesized with conventional heated eth- ylene glycol method.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"33 1","pages":"92-95"},"PeriodicalIF":0.0,"publicationDate":"2009-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90222176","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}

{"title":"Cataluminescence and Catalysis Properties of CO Oxidation Over Porous Network of ZrO2 Nanorods Synthesized by a Bio-Template","authors":"Teng Fei, Zhu Yongfa, He Gang, Gao Guizhi, Meng Dennis Desheng","doi":"10.2174/1876214X00902010086","DOIUrl":"https://doi.org/10.2174/1876214X00902010086","url":null,"abstract":"A network of ZrO2 nanorods was prepared using the porous biomembranes as templates. The sample was char- acterized by SEM, XRD and nitrogen physicosorption isotherm. ZrO2 nanoparticles were also prepared with a hydrother- mal method in order to compare with this network. The results showed that after being calcined at 800 o C for 24 h, a vol- ume contraction of ZrO2 nanorod network occurred accompanied by a phase transformation of tetragonal-to-monoclinic ZrO2; but the nanoparticles have grown into the large microparticles; as a result, ZrO2 nanorod network has a higher BET area (45.7 m 2 g -1 ) and a larger pore volume (0.20 cm 3 g -1 ). The calcined network showed a higher cataluminescence (CL) intensity of CO oxidation and a higher combustion activity than the calcined particles, which was ascribed its high surface area, as well as advanced pores.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"1 1","pages":"86-91"},"PeriodicalIF":0.0,"publicationDate":"2009-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91273437","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}

{"title":"Characterization of Catalyst-Supported Dielectric Barrier Discharge Reactor","authors":"Yao Shui-liang, Yamamoto Shin, Kodama Satoshi, Mineo Chieko, F. Yuichi","doi":"10.2174/1876214X00902010079","DOIUrl":"https://doi.org/10.2174/1876214X00902010079","url":null,"abstract":"The discharge properties and chemical reactions in plasma discharges using dielectric (alumina Al2O3) barrier discharge (DBD) reactors supported with Fe2O3 and TiO2 catalyst layers have been characterized. Ozone (O3) was used as a probe substance to monitor the chemical reactions driven by plasma discharges. The light emission from discharge gaps of the catalyst-supported DBD reactors due to plasma discharges was evaluated, using a monochromator equipped with a high dynamic range streak camera. It has been found that the catalyst layers of Fe2O3 and TiO2 do not obviously influence plasma discharges and O3 generation. Light emission from the discharge gaps of the catalyst-supported DBD reactors is different possibly due to the difference in light absorption and scattering by catalyst layers. The mechanism of catalysis effect on PM oxidative removal over Fe2O3 has been proposed, where Fe2O3 layer has the highest light absorption effect compared with that of TiO2 and Al2O3.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"43 1","pages":"79-85"},"PeriodicalIF":0.0,"publicationDate":"2009-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79005795","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}

{"title":"Stereoselective Aminomethylation of m-Cresol with Chiral Amine Mediated by 4 A0 Molecular Sieves Under Neat Conditions","authors":"M. Gholizadeh","doi":"10.2174/1876214X00902010054","DOIUrl":"https://doi.org/10.2174/1876214X00902010054","url":null,"abstract":"A minomethylation at ortho position with respect to hydroxyl group of mcresol in presence carefully dried 4A molecular sieves under neat conditions. One pot, two component,Mannich reaction of m-cresol with imine at 600C temperature under solvent free conditions affords the corresponding aminomethylated products in good yields, with moderate stereoselectivity.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"23 1","pages":"54-60"},"PeriodicalIF":0.0,"publicationDate":"2009-04-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80632625","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}

{"title":"A Simple Preparation Route to Palladium Nanoparticles Catalyst from Decomposition of Supported [Pd(lysine·HCl)(Cl)2] Complex","authors":"Hao Yu-zhi, Zhang Yu-long, Wang Li-hua, Ju Xiao-Yan","doi":"10.2174/1876214X00902010066","DOIUrl":"https://doi.org/10.2174/1876214X00902010066","url":null,"abstract":"The supported palladium nanoparticles catalyst with uniform-sized Pd particles distribution and without nitro- gen or chlorine atoms present in catalyst was prepared by calcination of the supported (Pd(lysine·HCl)(Cl)2) complex as precursor and characterized by TEM. Moreover the supported (Pd(lysine·HCl)(Cl)2) complex was from cation exchanging (Pd(lysine·HCl)(Cl)2) complex with inorganic support. The hydrogenation characteristic of supported Pd nanoparticles catalyst was evaluated by using benzoic acid.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"311 1","pages":"66-70"},"PeriodicalIF":0.0,"publicationDate":"2009-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77191810","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}

{"title":"Kinetics and Mechanism of Oxidation of D-Galactose by Chromium(VI) in Presence of 2,2 ´ -Bipyridine Catalyst in Aqueous Micellar Media","authors":"Bayen Ruhidas, K. DasAsim","doi":"10.2174/1876214X00902010071","DOIUrl":"https://doi.org/10.2174/1876214X00902010071","url":null,"abstract":"In aqueous H2SO4 media, the chromic acid oxidation of D-galactose in the presence and absence of 2,2 ´ - bipyridine (bpy) has been carried out under the conditions, (D-galactose)T >> (Cr(VI))T at different temperatures. The monomeric species of Cr (VI) has been found to be kinetically active in the absence of bpy whereas in the bpy-catalysed path, the Cr(VI) -bpy complex has been suggested as the active oxidant. In the bpy-catalysed path, Cr(VI)-bpy complex receives a nucleophilic attack by the substrate to form a ternary complex, which subsequently experiences a redox decomposition (through 2e transfer) at the rate-determining step leading to the product lactone and Cr(IV)-bpy complex. Then the Cr(IV)-bpy complex participates in faster steps in further oxidation of D- galactose and ultimately it is converted into Cr(III)-bpy complex. In the uncatalysed path, Cr(VI)-substrate ester experiences acid catalysed redox decomposition (2e-transfer) at the rate determining step. The uncatalysed path shows second order dependence on (H + ) while the bpy- catalysed path shows a first order dependence on (H + ). Both the uncatalysed path and bpy-catalysed path show the first order dependence on both (D-galactose)T and (Cr(VI))T. The bpy-catalysed path is first order in (bpy)T. These observations remain unaltered in the presence of externally added surfactants. Effect of the surfactants like N-cetylpyridinium chloride (CPC, a cationic surfactant) and sodium dodecyl sulfate (SDS, an anionic surfactant), on both the uncatalysed and bpy- catalysed paths has been studied. CPC inhibits both the uncatalysed and bpy-catalysed path, while SDS accelerates the reactions. In the catalysed path, cationic Cr(VI)-bpy complex is the reactive species which is attracted by the anionic micellar head groups of SDS but repelled by the cationic micellar head groups of CPC. The neutral substrate is accumulated in the Stern layer of both types of micelles. Thus the observed micellar effects have been explained by considering the hydrophobic and electrostatic interactions between the reactants and surfactants in terms of the proposed mechanism.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"6 1","pages":"71-78"},"PeriodicalIF":0.0,"publicationDate":"2009-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84703658","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}

{"title":"Waugh Type Enneamolybdomanganate(IV) Catalyzed Synthesis of Polyhydrquinoline Through Hantzsch Multi-Component Condensation","authors":"A. Supale, G. Gokavi","doi":"10.2174/1876214X00902010061","DOIUrl":"https://doi.org/10.2174/1876214X00902010061","url":null,"abstract":"An efficient one pot coupling of aldehydes, dimedone, ammonium acetate and ethyl acetoacetate by using cata- lytic amount of enneamolybdomanganate(IV) is reported. Various polyhydroquinoline derivatives have been prepared in high yields and comparatively less reaction time.","PeriodicalId":22755,"journal":{"name":"The Open Catalysis Journal","volume":"25 1","pages":"61-65"},"PeriodicalIF":0.0,"publicationDate":"2009-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81432147","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}