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Modification of the micropore characteristics of the desilicated ZSM-5 zeolite by thermal treatment 热处理对脱硅ZSM-5沸石微孔特性的影响
Zeolites Pub Date : 1997-10-01 DOI: 10.1016/S0144-2449(97)00084-5
R. Mao, S. Le, D. Ohayon, F. Caillibot, L. Gélébart, G. Dénès
{"title":"Modification of the micropore characteristics of the desilicated ZSM-5 zeolite by thermal treatment","authors":"R. Mao, S. Le, D. Ohayon, F. Caillibot, L. Gélébart, G. Dénès","doi":"10.1016/S0144-2449(97)00084-5","DOIUrl":"https://doi.org/10.1016/S0144-2449(97)00084-5","url":null,"abstract":"","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"47 1","pages":"270-278"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78938896","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: 36
On the nature of framework Brønsted and Lewis acid sites in ZSM-5 ZSM-5中Brønsted和Lewis酸位的性质
Zeolites Pub Date : 1997-10-01 DOI: 10.1016/S0144-2449(97)00086-9
G.L. Woolery, G.H. Kuehl, H.C. Timken, A.W. Chester, J.C. Vartuli
{"title":"On the nature of framework Brønsted and Lewis acid sites in ZSM-5","authors":"G.L. Woolery,&nbsp;G.H. Kuehl,&nbsp;H.C. Timken,&nbsp;A.W. Chester,&nbsp;J.C. Vartuli","doi":"10.1016/S0144-2449(97)00086-9","DOIUrl":"10.1016/S0144-2449(97)00086-9","url":null,"abstract":"<div><p>The acidity of aluminum in a nominally 70:1 SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>, ratio ZSM-5 prepared by conventional means was characterized by TPAD, <sup>27</sup>Al and <sup>29</sup>Si n.m.r., XRD, and <em>FT</em>i.r. Discrepancies observed between the amount of tetrahedral “acidic” aluminum measured by TPAD and i.r. versus Al n.m.r. are due to the presence of Lewis aluminum. Furthermore, it is suggested that this Lewis aluminum may be located <em>in</em> the zeolite framework. These sites are not thought to be inherent to the ZSM-5 structure but are probably generated during calcination, resulting in partial hydrolysis of AlO bonds. A small percentage of octahedral aluminum was observed in hydrated HZSM-5, but was quantitatively converted to tetrahedral aluminum by treatment with ammonium nitrate solution at pH 8.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 4","pages":"Pages 288-296"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00086-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85764567","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: 233
TiF4 : An original and very interesting precursor to the synthesis of titanium containing silicalite-1 TiF4:合成含硅-1钛的原始且非常有趣的前体
Zeolites Pub Date : 1997-10-01 DOI: 10.1016/S0144-2449(97)00067-5
E. Jorda, A. Tuel, R. Teissier, J. Kervennal
{"title":"TiF4 : An original and very interesting precursor to the synthesis of titanium containing silicalite-1","authors":"E. Jorda,&nbsp;A. Tuel,&nbsp;R. Teissier,&nbsp;J. Kervennal","doi":"10.1016/S0144-2449(97)00067-5","DOIUrl":"https://doi.org/10.1016/S0144-2449(97)00067-5","url":null,"abstract":"<div><p>A new titanium precursor, TiF<sub>4</sub>, has been used to synthesize titanium silicalite-1 (TS-1). In contrast to the commonly used alkoxides, TiF<sub>4</sub> is stable in air, water, and even basic TPAOH solutions, which offers considerable advantages as compared to conventional synthesis routes. In particular, TS-1 can be obtained with commercial TPAOH solutions, containing alkali cations, without formation of extraframework species. For samples synthesized with alkali-free TPAOH solutions, the maximum Ti incorporation that can be achieved corresponds to about 2.05 Ti/u.c., and TS-1 samples are similar to previously reported solids prepared with titanium alkoxides. In particular, they are very active in the ammoximation of cyclohexanone and the hydroxylation of phenol with hydrogen peroxide. When TS-1 is prepared with commercial TPAOH solutions, alkali cations can be removed by washing the solid with dilute acid, and the catalytic performance of the washed zeolite is similar to that of samples synthesized with alkali-free TPAOH.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 4","pages":"Pages 238-245"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00067-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91604594","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: 60
Synthesis and electron spin resonance studies of MCM-41 doped with copper pyridine complexes 掺杂铜吡啶配合物MCM-41的合成及电子自旋共振研究
Zeolites Pub Date : 1997-10-01 DOI: 10.1016/S0144-2449(97)00096-1
Winfried Böhlmann, Katrin Schandert, Andreas Pöppl, H.-C. Semmelhack
{"title":"Synthesis and electron spin resonance studies of MCM-41 doped with copper pyridine complexes","authors":"Winfried Böhlmann,&nbsp;Katrin Schandert,&nbsp;Andreas Pöppl,&nbsp;H.-C. Semmelhack","doi":"10.1016/S0144-2449(97)00096-1","DOIUrl":"10.1016/S0144-2449(97)00096-1","url":null,"abstract":"<div><p>Mesoporous MCM-41 materials have been synthesized and loaded with copper pyridine complexes by an ion-exchange procedure. Nitrogen adsorption and X-ray diffraction studies of the parent and loaded MCM-41 materials confirm the incorporation of the copper complexes into the mesopores of the MCM-41 structure. The incorporation status of the organometallic copper complexes is monitored by electron spin resonance and electron spin echo envelope modulation spectroscopy during the preparation procedure. Immobilized isolated copper pyridine complexes as well as agglomerates of complexes have been found in the ion-exchanged mesoporous material.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 4","pages":"Pages 297-304"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00096-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78397121","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: 6
Growth model of oriented crystals of zeolite Si-ZSM-5 Si-ZSM-5沸石取向晶体的生长模型
Zeolites Pub Date : 1997-10-01 DOI: 10.1016/S0144-2449(97)00088-2
J.H. Koegler, H. van Bekkum, J.C. Jansen
{"title":"Growth model of oriented crystals of zeolite Si-ZSM-5","authors":"J.H. Koegler,&nbsp;H. van Bekkum,&nbsp;J.C. Jansen","doi":"10.1016/S0144-2449(97)00088-2","DOIUrl":"https://doi.org/10.1016/S0144-2449(97)00088-2","url":null,"abstract":"<div><p>A model for the growth of Si-ZSM-5 (silicalite-1) crystals from zeolite synthesis mixtures is proposed. Nucleation and crystal growth occur at the interface of gel particles and liquid, the only place where both the silicon source and template are present in abundance. In the extension of this model to growth on a support surface, a precursor gel layer plays an important role as an anchoring site for the template molecules. Orientation results from the preferential growth of the <em>ac</em>-plane of the crystallites in the plane of the substrate surface. The presence of alkali ions at this surface may adversely affect zeolite nucleation.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 4","pages":"Pages 262-269"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00088-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89993423","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: 98
XPS study of Pt ammine decomposition in K faujasites: Comparison with bulk behavior 铂胺在山竹石中分解的XPS研究:与散装行为的比较
Zeolites Pub Date : 1997-10-01 DOI: 10.1016/S0144-2449(97)00066-3
Z. Bastl, L. Kubelková, J. Nováková
{"title":"XPS study of Pt ammine decomposition in K faujasites: Comparison with bulk behavior","authors":"Z. Bastl,&nbsp;L. Kubelková,&nbsp;J. Nováková","doi":"10.1016/S0144-2449(97)00066-3","DOIUrl":"https://doi.org/10.1016/S0144-2449(97)00066-3","url":null,"abstract":"<div><p>The XPS method is employed to compare the behavior of [Pt(NH<sub>3</sub>)<sub>4</sub>]<sup>2+</sup> ions in the surface layers of KX and KY zeolites with that in the zeolite bulk. <em>FT</em> i.r. and MS-t.p.d. methods are used to characterize the bulk properties. XPS and <em>FT</em> i.r. reveal the formation of different intermediate NH<em><sub>x</sub></em> species during the decomposition of the ammine complex in a vacuum. They are interpreted as Pt-diammine, framework ammine, and immine complexes. The maximum evolution of ammonia occurs in the temperature interval ranging from 150°C to 250°C. Positive shifts of Pt: (4f) photoelectrons, observed for samples with a decomposed Pt-ammine complex, are explained by a decrease of the population of Pt 5d levels in encaged metallic clusters. The surface concentration of Pt decreases with increasing temperature due to the inward diffusion of Pt atoms.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 4","pages":"Pages 279-287"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00066-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89993424","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
Growth model of oriented crystals of zeolite Si-ZSM-5 Si-ZSM-5沸石取向晶体的生长模型
Zeolites Pub Date : 1997-10-01 DOI: 10.1016/S0144-2449(97)00088-2
J. Koegler, H. Bekkum, J. C. Jansen
{"title":"Growth model of oriented crystals of zeolite Si-ZSM-5","authors":"J. Koegler, H. Bekkum, J. C. Jansen","doi":"10.1016/S0144-2449(97)00088-2","DOIUrl":"https://doi.org/10.1016/S0144-2449(97)00088-2","url":null,"abstract":"","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"39 1","pages":"262-269"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85731745","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: 98
Aluminum-rich zeolite beta 富铝沸石
Zeolites Pub Date : 1997-10-01 DOI: 10.1016/S0144-2449(97)00083-3
F. Vaudry, F. Di Renzo, P. Espiau, F. Fajula, Ph. Schulz
{"title":"Aluminum-rich zeolite beta","authors":"F. Vaudry,&nbsp;F. Di Renzo,&nbsp;P. Espiau,&nbsp;F. Fajula,&nbsp;Ph. Schulz","doi":"10.1016/S0144-2449(97)00083-3","DOIUrl":"10.1016/S0144-2449(97)00083-3","url":null,"abstract":"<div><p>Hydrothermal synthesis of zeolite beta with an aluminum content as high as 8 atoms per unit cell has been performed in sodium-tetraethylammonium systems. Low alkalinity is required to avoid the formation of denser phases. Sodium cations are needed for charge balance beyond 6 Al/unit cell. The concentration of lattice defects in the solids richest in aluminum provides information about the templating effect of tetraethylammonium in this system.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 4","pages":"Pages 253-258"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00083-3","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84327553","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: 45
Patent report 专利报告
Zeolites Pub Date : 1997-10-01 DOI: 10.1016/S0144-2449(97)00111-5
{"title":"Patent report","authors":"","doi":"10.1016/S0144-2449(97)00111-5","DOIUrl":"https://doi.org/10.1016/S0144-2449(97)00111-5","url":null,"abstract":"","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 4","pages":"Pages 307-311"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00111-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"137055556","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
A tribute to Professor Lovat V.C. Rees on the occassion of his 70th birthday 在Lovat V.C. Rees教授70岁生日之际，向他致敬
Zeolites Pub Date : 1997-10-01 DOI: 10.1016/S0144-2449(97)00130-9
Alan Dyer
{"title":"A tribute to Professor Lovat V.C. Rees on the occassion of his 70th birthday","authors":"Alan Dyer","doi":"10.1016/S0144-2449(97)00130-9","DOIUrl":"10.1016/S0144-2449(97)00130-9","url":null,"abstract":"","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 4","pages":"Pages 305-306"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00130-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85242342","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: 1
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