Pub Date : 2017-11-06DOI: 10.2174/2211544706666170109142953
Anil B. Gawade, G. Yadav
{"title":"Catalytic Self-condensation of 5-Hydroxymethylfurfural over Modified Heteropolyacid","authors":"Anil B. Gawade, G. Yadav","doi":"10.2174/2211544706666170109142953","DOIUrl":"https://doi.org/10.2174/2211544706666170109142953","url":null,"abstract":"","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"084 1","pages":"193-200"},"PeriodicalIF":0.0,"publicationDate":"2017-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91156569","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}
Pub Date : 2017-10-10DOI: 10.2174/2211544706666171010155918
A. Nakhaei
{"title":"Nano-Fe3O4@ZrO2-H3PO4 as an Efficient Recyclable Catalyst for the Neat Preparation of Thiazole Derivatives in Ordinary or Magnetized Water","authors":"A. Nakhaei","doi":"10.2174/2211544706666171010155918","DOIUrl":"https://doi.org/10.2174/2211544706666171010155918","url":null,"abstract":"","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"116 1","pages":"1-1"},"PeriodicalIF":0.0,"publicationDate":"2017-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80758409","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}
Pub Date : 2017-10-10DOI: 10.2174/2211544706666171010160527
N. Kaur, N. K. Jangid, Varun Rawat
{"title":"Synthesis of Heterocycles Through Platinum-Catalyzed Reactions","authors":"N. Kaur, N. K. Jangid, Varun Rawat","doi":"10.2174/2211544706666171010160527","DOIUrl":"https://doi.org/10.2174/2211544706666171010160527","url":null,"abstract":"","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"102 1","pages":"3-25"},"PeriodicalIF":0.0,"publicationDate":"2017-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76890114","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}
Pub Date : 2017-07-31DOI: 10.2174/2211544706666170117122325
A. S. Burange, Ashtami Jayakumar, Amber J. Sahani, S. Ladage, R. Jayaram
{"title":"Green Oxidation Protocol for Alcohols to Carbonyls by Tertbutylhydroperoxide Over MnO2 Catalysts: Comparison of Bulk and Nanostructure","authors":"A. S. Burange, Ashtami Jayakumar, Amber J. Sahani, S. Ladage, R. Jayaram","doi":"10.2174/2211544706666170117122325","DOIUrl":"https://doi.org/10.2174/2211544706666170117122325","url":null,"abstract":"","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"40 1","pages":"115-122"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83156100","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}
Pub Date : 2017-07-31DOI: 10.2174/2211544705666160722112337
K. Reddy
{"title":"Aliovalent Metal Ion Doped Ceria Catalysts for CO and Soot Oxidation","authors":"K. Reddy","doi":"10.2174/2211544705666160722112337","DOIUrl":"https://doi.org/10.2174/2211544705666160722112337","url":null,"abstract":"","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"18 1","pages":"68-76"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81813737","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}
Pub Date : 2017-07-31DOI: 10.2174/2211544706666161221153955
V. Matyshak
{"title":"Systematic Research of Intermediates as a Key to the Understanding of Catalytic Phenomenon","authors":"V. Matyshak","doi":"10.2174/2211544706666161221153955","DOIUrl":"https://doi.org/10.2174/2211544706666161221153955","url":null,"abstract":"","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"31 1","pages":"90-96"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88028997","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}
Pub Date : 2017-07-31DOI: 10.2174/2211544705666161123122411
Shivaji L. Bhanawase, G. Yadav
Background: Dehydrozingerone is a biosynthetic intermediate and structural analog of curcumin. It is a flavoring ingredient and has antioxidant and antimutagenic properties. Dehydrozingerone can be efficiently synthesized from vanillin and acetone by cross-aldol (or Claisen-Schmidt) condensation using heterogeneous base catalysts. Vanillin can be sourced from the valorization of biomass. Green chemistry aspects such as 100 % atom economy and low E factor are very important in any synthesis which could be achieved by use of heterogeneous catalysis. Methods: Hydrotalcites with different Mg: Al ratio were synthesized and calcined in air at 450 oC and 500 oC to understand the effect of catalyst composition and calcination temperature on activity and selectivity in the synthesis of dehydrozingerone from vanillin and acetone. All catalysts were characterized by different techniques such as XRD, FTIR, ASAP, TPD, TEM and SEM-EDXS. Effects of various process parameters were studied to establish reaction mechanism and kinetics. The kinetic model was validated by experimental data. The product was confirmed by GC-MS and 1H NMR. Results: Among all catalysts, hydrotalcite of Mg: Al of mole ratio 3:1, calcined at 500 oC for 6 h (31CHT500) was found active, selective and reusable. Hydrotalcite calcined at 500 oC gave mixed Mg- Al metal oxides. Dehydrozingerone was efficiently obtained with 100 % selectivity at vanillin conversion of 88 % over 31CHT500 at 130 oC after 4 h. A pseudo first order kinetics was found to fit the data well. Conclusion: Catalyst composition and calcination temperature were affecting the activity of catalysts. Temperature, catalyst loading and vanillin to acetone mole ratio were influencing the reaction rate. Maximum yield of dehydrozingerone was obtained at following reaction conditions: temperature, 130 oC; amount of catalyst, 0.015 g mL −1 ; mole ratio of vanillin: acetone, 1:15; autogenous pressure, 10 atm. All species were weakly adsorbed on catalytic sites. The reaction was pseudo first order with apparent activation energy of 9.4 kcal mol-1. Dehydrozingerone was synthesized from vanillin and acetone by a green process.
背景:脱氢姜酮是姜黄素的生物合成中间体和结构类似物。它是一种调味料，具有抗氧化和抗诱变的特性。以香兰素和丙酮为原料，在非均相碱催化下，通过交叉醛醇(或Claisen-Schmidt)缩合反应可高效合成脱氢姜酮。香兰素可以从生物质的增值中获得。绿色化学方面，如100%原子经济性和低E因子是非常重要的，在任何合成可以实现使用多相催化。方法:合成不同镁铝比的水滑石，在450℃和500℃的空气中煅烧，考察催化剂组成和煅烧温度对香兰素和丙酮合成脱氢姜酮活性和选择性的影响。采用XRD、FTIR、ASAP、TPD、TEM、SEM-EDXS等技术对催化剂进行了表征。研究了不同工艺参数对反应的影响，建立了反应机理和动力学。实验数据验证了动力学模型的正确性。产物经GC-MS和1H NMR确证。结果:在所有催化剂中，Mg: Al摩尔比为3:1的水滑石(31CHT500)在500℃下煅烧6 h具有良好的活性、选择性和可重复使用性。水滑石在500℃下煅烧得到混合镁铝金属氧化物。在131 cht500条件下，在130℃下反应4 h，香兰素转化率为88%，脱氢姜酮的选择性为100%。结论:催化剂组成和煅烧温度影响催化剂的活性。温度、催化剂用量和香兰素与丙酮的摩尔比是影响反应速率的主要因素。在反应温度130℃时，脱氢姜酮的产率最高;催化剂用量，0.015 g mL−1;香兰素:丙酮摩尔比1:15;自用压力，10atm。所有的物质都被弱吸附在催化位点上。该反应为准一级反应，表观活化能为9.4 kcal mol-1。以香兰素和丙酮为原料，采用绿色工艺合成了脱氢姜酮。
{"title":"Hydrotalcite as Active and Selective Catalyst for Synthesis of Dehydrozingerone from Vanillin and Acetone: Effect of Catalyst Composition and Calcination Temperature on Activity and Selectivity","authors":"Shivaji L. Bhanawase, G. Yadav","doi":"10.2174/2211544705666161123122411","DOIUrl":"https://doi.org/10.2174/2211544705666161123122411","url":null,"abstract":"Background: Dehydrozingerone is a biosynthetic intermediate and structural analog of curcumin. It is a flavoring ingredient and has antioxidant and antimutagenic properties. Dehydrozingerone can be efficiently synthesized from vanillin and acetone by cross-aldol (or Claisen-Schmidt) condensation using heterogeneous base catalysts. Vanillin can be sourced from the valorization of biomass. Green chemistry aspects such as 100 % atom economy and low E factor are very important in any synthesis which could be achieved by use of heterogeneous catalysis. Methods: Hydrotalcites with different Mg: Al ratio were synthesized and calcined in air at 450 oC and 500 oC to understand the effect of catalyst composition and calcination temperature on activity and selectivity in the synthesis of dehydrozingerone from vanillin and acetone. All catalysts were characterized by different techniques such as XRD, FTIR, ASAP, TPD, TEM and SEM-EDXS. Effects of various process parameters were studied to establish reaction mechanism and kinetics. The kinetic model was validated by experimental data. The product was confirmed by GC-MS and 1H NMR. Results: Among all catalysts, hydrotalcite of Mg: Al of mole ratio 3:1, calcined at 500 oC for 6 h (31CHT500) was found active, selective and reusable. Hydrotalcite calcined at 500 oC gave mixed Mg- Al metal oxides. Dehydrozingerone was efficiently obtained with 100 % selectivity at vanillin conversion of 88 % over 31CHT500 at 130 oC after 4 h. A pseudo first order kinetics was found to fit the data well. Conclusion: Catalyst composition and calcination temperature were affecting the activity of catalysts. Temperature, catalyst loading and vanillin to acetone mole ratio were influencing the reaction rate. Maximum yield of dehydrozingerone was obtained at following reaction conditions: temperature, 130 oC; amount of catalyst, 0.015 g mL −1 ; mole ratio of vanillin: acetone, 1:15; autogenous pressure, 10 atm. All species were weakly adsorbed on catalytic sites. The reaction was pseudo first order with apparent activation energy of 9.4 kcal mol-1. Dehydrozingerone was synthesized from vanillin and acetone by a green process.","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"352 1","pages":"105-114"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76597516","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}
Pub Date : 2017-07-31DOI: 10.2174/2211544705666161130161108
Reza Haddad
{"title":"Use of Giant Nano-Polyoxotungstate as a Heterogeneous Catalyst for Green Selective Oxidation of Chemical Warfare Agent Simulants with Aqueous Hydrogen Peroxide","authors":"Reza Haddad","doi":"10.2174/2211544705666161130161108","DOIUrl":"https://doi.org/10.2174/2211544705666161130161108","url":null,"abstract":"","PeriodicalId":10862,"journal":{"name":"Current Catalysis","volume":"39 1","pages":"97-104"},"PeriodicalIF":0.0,"publicationDate":"2017-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77800878","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}
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