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Preparation and catalytic properties of supported heteropolyacid salts 负载型杂多酸盐的制备及其催化性能
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-11-01 DOI: 10.1016/S0923-0467(96)03136-3
S. Soled, S. Miseo, G. McVicker, W.E. Gates, A. Gutierrez, J. Paes
{"title":"Preparation and catalytic properties of supported heteropolyacid salts","authors":"S. Soled,&nbsp;S. Miseo,&nbsp;G. McVicker,&nbsp;W.E. Gates,&nbsp;A. Gutierrez,&nbsp;J. Paes","doi":"10.1016/S0923-0467(96)03136-3","DOIUrl":"10.1016/S0923-0467(96)03136-3","url":null,"abstract":"<div><p>Heteropoly compounds are receiving increasing interest as environmentally compatible solid acid catalysts. Partial Cs<sup>+</sup> exchange into 12-tungstophosphoric acid converts the water soluble, low surface area (&lt; 5 m<sup>2</sup> g<sup>−1</sup>) parent acid into submicron water-insoluble Brønsted acids with surface areas exceeding 100 m<sup>2</sup> g<sup>−1</sup>. The insolubility of the Cs acid salt makes preparation of large particle supported catalysts by conventional impregnation procedures impractical, although applications in packed bed or slurry reactors require millimeter-sized pellets to avoid pressure drop or filtration problems. Here, we report on a new but simple technique that produces an eggwhite distribution of active Cs-acid salt of 12-tungstophosphoric acid within a large silica extrudate by carrying out a reaction deposition directly inside the extrudate. We examine these catalysts in aromatic alkylation reactions.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"64 2","pages":"Pages 247-254"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0923-0467(96)03136-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82893533","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: 10
Brønsted-type relationship for surface active sites on solid acid catalysts: 1-butene isomerization on TiO2SiO2, ZrO2SiO2, and Al2O3SiO2 mixed oxide catalysts 固体酸催化剂表面活性位点的br ønsted型关系:TiO2SiO2、ZrO2SiO2和Al2O3SiO2混合氧化物催化剂上的1-丁烯异构化
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-11-01 DOI: 10.1016/S0923-0467(96)03140-5
Cristian Contescu , Vlad T. Popa , James B. Miller , Edmond I. Ko , James A. Schwarz
{"title":"Brønsted-type relationship for surface active sites on solid acid catalysts: 1-butene isomerization on TiO2SiO2, ZrO2SiO2, and Al2O3SiO2 mixed oxide catalysts","authors":"Cristian Contescu ,&nbsp;Vlad T. Popa ,&nbsp;James B. Miller ,&nbsp;Edmond I. Ko ,&nbsp;James A. Schwarz","doi":"10.1016/S0923-0467(96)03140-5","DOIUrl":"10.1016/S0923-0467(96)03140-5","url":null,"abstract":"<div><p>Acidic properties (acid sites' strength and concentration) of three series of mixed oxide catalysts (titania-silica, zirconia-silica and alumina-silica) were analyzed by proton affinity distributions. Catalytic properties under mild dehydration conditions (1-butene isomerization at 423 K) of these materials were also evaluated. A Brønsted-type correlation was found between first-order apparent isomerization rate constants and acid strengths of certain components of the p<em>K</em> spectra of the catalysts. This was explained in terms of proton transfer processes that take place at both wet and dry interfaces, i.e. at the surface hydroxyl layer. The results were discussed in terms of Fourier transform infrared data which indicate the presence of large surface hydroxyl populations on all catalysts under the reaction conditions.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"64 2","pages":"Pages 265-272"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0923-0467(96)03140-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89395397","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Transition metal-promoted oxidation catalysis by fluorite oxides: A study of CO oxidation over CuCeO2 过渡金属促进的萤石氧化物氧化催化:Cu上CO氧化CeO2的研究
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-11-01 DOI: 10.1016/S0923-0467(96)03135-1
Wei Liu , Maria Flytzani-Stephanopoulos
{"title":"Transition metal-promoted oxidation catalysis by fluorite oxides: A study of CO oxidation over CuCeO2","authors":"Wei Liu ,&nbsp;Maria Flytzani-Stephanopoulos","doi":"10.1016/S0923-0467(96)03135-1","DOIUrl":"10.1016/S0923-0467(96)03135-1","url":null,"abstract":"<div><p>In this paper, The CuCeO<sub>2</sub> system is chosen as a model catalyst and CO oxidation is used as a probe reaction to illustrate the strong interaction and symergism observed when transition metal-promoted fluorite oxides are used as total oxidation catalysts. It was found that only small amounts of copper are sufficient to promote the catalytic activity of CeO<sub>2</sub> by several orders of magnitude, while excessive amounts of copper (Cu/(Cu+Ce) &gt; 0.05) are detrimental to the catalyst thermal and hydrothermal stability. Heating the catalyst to temperatures over 800 °C has a significant impact on the catalytic activity because of crystal growth of cerium oxide, loss of surface oxygen, and copper aggregation.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"64 2","pages":"Pages 283-294"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0923-0467(96)03135-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89809976","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: 89
Preparation of oxide catalysts and catalyst supports — a review of recent advances 氧化物催化剂和催化剂载体的制备——最新进展综述
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-11-01 DOI: 10.1016/S0923-0467(96)03139-9
Harold H. Kung , Edmond I. Ko
{"title":"Preparation of oxide catalysts and catalyst supports — a review of recent advances","authors":"Harold H. Kung ,&nbsp;Edmond I. Ko","doi":"10.1016/S0923-0467(96)03139-9","DOIUrl":"10.1016/S0923-0467(96)03139-9","url":null,"abstract":"<div><p>Recent progress in the understanding of the effect of preparation variables on the properties of oxide materials, either to be used as catalysts or catalyst supports, are summarized. The methods include sol-gel technique, use of surfactant to prepare mesoporous and related materials, equilibrium adsorption technique, preparation of hydrotalcite materials, and use of preformed multicomponent complexes. The control of the properties of the oxide material, such as pore size, surface area, and homogeneity by controlling the preparation variables in different methods, and the chemical processes involved in these methods are discussed.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"64 2","pages":"Pages 203-214"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0923-0467(96)03139-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81319039","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: 51
Subject index of volume 64, no. 2 第64卷主题索引。2
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-11-01 DOI: 10.1016/S0923-0467(96)87013-8
{"title":"Subject index of volume 64, no. 2","authors":"","doi":"10.1016/S0923-0467(96)87013-8","DOIUrl":"https://doi.org/10.1016/S0923-0467(96)87013-8","url":null,"abstract":"","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"64 2","pages":"Pages 305-306"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0923-0467(96)87013-8","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137223489","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
Synthesis and characteristics of non-stoichiometric nanocrystalline cerium oxide-based catalysts 非化学计量纳米氧化铈基催化剂的合成与性能研究
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-11-01 DOI: 10.1016/S0923-0467(96)03142-9
Jackie Y. Ying, Andreas Tschöpe
{"title":"Synthesis and characteristics of non-stoichiometric nanocrystalline cerium oxide-based catalysts","authors":"Jackie Y. Ying,&nbsp;Andreas Tschöpe","doi":"10.1016/S0923-0467(96)03142-9","DOIUrl":"10.1016/S0923-0467(96)03142-9","url":null,"abstract":"<div><p>Nanocrystalline materials are associated with high surface area and reactivity. Gas condensation techniques have been developed to synthesize such systems with a unique control of stoichiometry and dispersion. The high concentrations of oxygen vacancies and surface adsorbed species in nanocrystalline CeO<sub>2−<em>x</em></sub> were found to greatly enhance catalytic activity in SO<sub>2</sub> reduction and CO oxidation. By having an ultrahigh dispersion of Cu on nanocrystalline CeO<sub>2−<em>x</em></sub>, we have further demonstrated the possibility of tailoring intimate synergistic effects between different components in a nanocomposite material. The resulting supported base metal system has an unusually high thermal stability and could selectively catalyze SO<sub>2</sub> reduction and CO oxidation at significantly lower temperatures (420 °C and 80 °C, respectively). The high redox activity of the nanocrystalline CeO<sub>2−<em>x</em></sub>-based system is tied to the microstructure, surface chemistry, and electrical conductivity of this advanced catalyst.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"64 2","pages":"Pages 225-237"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0923-0467(96)03142-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74350395","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: 15
A Brønsted acid strength hierarchy for zirconia—silica—sulfate aerogels 氧化锆-二氧化硅-硫酸盐气凝胶的Brønsted酸强度等级
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-11-01 DOI: 10.1016/S0923-0467(96)03141-7
James B. Miller, Edmond I. Ko
{"title":"A Brønsted acid strength hierarchy for zirconia—silica—sulfate aerogels","authors":"James B. Miller,&nbsp;Edmond I. Ko","doi":"10.1016/S0923-0467(96)03141-7","DOIUrl":"10.1016/S0923-0467(96)03141-7","url":null,"abstract":"<div><p>Manipulation of sulfate content, silica content, and activation temperature provides the means for controlling the strength of surface Brønsted acid sites in the zirconia—silica—sulfate system. This capability allows a development of an acid strength hierarchy, based on the adsorption of pyridine and isomerization of 1-butene and n-butane, as a rational basis for acid catalyst design. Introduction of silica into zirconia—sulfate co-gels also provides insight into the activation behavior of this important class of materials. Silica retards sintering upon heat treatment, thereby delaying crystallization of the zirconia component to higher temperatures. Activation of sulfate to a form capable of catalyzing the isomerization of n-butane is also delayed to higher heat treatment temperatures, confirming the role of crystallization in initiating the activation sequence.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"64 2","pages":"Pages 273-281"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0923-0467(96)03141-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75867109","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: 3
Metal oxides as catalysts for the oxidation of soot 金属氧化物作为煤烟氧化的催化剂
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-11-01 DOI: 10.1016/S0923-0467(96)03138-7
John P.A. Neeft, Michiel Makkee, Jacob A. Moulijn
{"title":"Metal oxides as catalysts for the oxidation of soot","authors":"John P.A. Neeft,&nbsp;Michiel Makkee,&nbsp;Jacob A. Moulijn","doi":"10.1016/S0923-0467(96)03138-7","DOIUrl":"10.1016/S0923-0467(96)03138-7","url":null,"abstract":"<div><p>A large number of candidate soot oxidation catalysts were screened on their catalytic activity with a model soot. It was found that the intensity of contact between soot and catalyst is one of the major parameters that determine the soot oxidation rate. Two types of contact were studied: many catalysts increase the rate of soot oxidation considerably when, under model conditions, the contact is intimate (“tight”); whereas under conditions of poor (‘loose”) contact, which can be resemblant of the contact in practice, only some catalysts are able to accelerate this oxidation reaction. It is tenatively suggested that (i) mobility of the catalyst is a major parameter determining the loose contact activity of catalysts, and (ii) this mobility correlates with the melting point or the partial pressure of the catalyst.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"64 2","pages":"Pages 295-302"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0923-0467(96)03138-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73911670","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: 76
Author index of volume 64, no. 2 第64卷作者索引。2
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-11-01 DOI: 10.1016/S0923-0467(96)87012-6
{"title":"Author index of volume 64, no. 2","authors":"","doi":"10.1016/S0923-0467(96)87012-6","DOIUrl":"https://doi.org/10.1016/S0923-0467(96)87012-6","url":null,"abstract":"","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"64 2","pages":"Page 303"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0923-0467(96)87012-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137223490","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
Effect of pore size of mesoporous molecular sieves (MCM-41) on Al stability and acidity 介孔分子筛(MCM-41)孔径对铝稳定性和酸性的影响
The Chemical Engineering Journal and the Biochemical Engineering Journal Pub Date : 1996-11-01 DOI: 10.1016/S0923-0467(96)03143-0
Xiaobing Feng , Jae Sung Lee , Jun Won Lee , Jeong Yong Lee , Di Wei , G.L. Haller
{"title":"Effect of pore size of mesoporous molecular sieves (MCM-41) on Al stability and acidity","authors":"Xiaobing Feng ,&nbsp;Jae Sung Lee ,&nbsp;Jun Won Lee ,&nbsp;Jeong Yong Lee ,&nbsp;Di Wei ,&nbsp;G.L. Haller","doi":"10.1016/S0923-0467(96)03143-0","DOIUrl":"10.1016/S0923-0467(96)03143-0","url":null,"abstract":"<div><p>A matrix of mesoporous molecular sieves (MCM-41) with various Si/Al ratios and various pore sizes was synthesized. These were structurally characterized by X-ray diffraction, IR and <sup>27</sup>Al NMR. The relative acidity of these materials was estimated catalytically based on the isomerization selectivity of 2-methyl-2-pentene. The activity and selectivity of this reaction are affected by both the Si/Al ratio and the pore size at fixed composition. The stability of Al in the wall structure (as tetrahedral Al) is also affected by the pore size, the smallest pore size resulting in the most stable tetrahedral Al.</p></div>","PeriodicalId":101226,"journal":{"name":"The Chemical Engineering Journal and the Biochemical Engineering Journal","volume":"64 2","pages":"Pages 255-263"},"PeriodicalIF":0.0,"publicationDate":"1996-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0923-0467(96)03143-0","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73158117","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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