ZeolitesPub Date : 1997-11-01DOI: 10.1016/S0144-2449(97)00115-2
M.J. den Exter, J.C. Jansen, H. van Bekkum, A. Zikánova
{"title":"Synthesis and characterization of the all-silica 8-ring Clathrasil DD3R comparison of adsorption properties with the hydrophilic zeolite A","authors":"M.J. den Exter, J.C. Jansen, H. van Bekkum, A. Zikánova","doi":"10.1016/S0144-2449(97)00115-2","DOIUrl":"10.1016/S0144-2449(97)00115-2","url":null,"abstract":"<div><p>The adsorption properties of the clathrasil Deca-dodecasil 3R (DD3R) have been studied. This porous tectosilicate becomes microporous when the organic template 1-adamantanamine is removed by calcination, which gives this clathrasil zeolitical properties. By means of adsorption of water, DD3R has been proven to be very hydrophobic. These adsorption data, together with the isosteric heats of adsorption of carbon dioxide at different loadings, reveal the absence of strong adsorption sites for polar or polarizable molecules, in contrast to the adsorbent zeolite A.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 5","pages":"Pages 353-358"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00115-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79589747","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: 39
ZeolitesPub Date : 1997-11-01DOI: 10.1016/S0144-2449(97)00117-6
Herman van Bekkum
{"title":"","authors":"Herman van Bekkum","doi":"10.1016/S0144-2449(97)00117-6","DOIUrl":"10.1016/S0144-2449(97)00117-6","url":null,"abstract":"","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 5","pages":"Page 463"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00117-6","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"95555703","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}
ZeolitesPub Date : 1997-11-01DOI: 10.1016/S0144-2449(97)00102-4
A. Alberti, A. Martucci, E. Galli, G. Vezzalini
{"title":"A reexamination of the crystal structure of erionite","authors":"A. Alberti, A. Martucci, E. Galli, G. Vezzalini","doi":"10.1016/S0144-2449(97)00102-4","DOIUrl":"10.1016/S0144-2449(97)00102-4","url":null,"abstract":"<div><p>The crystal structure of a natural erionite from Nizhnyaya Tunguska, Siberia (schematic formula K<sub>2</sub>Ca<sub>3.5</sub>Al<sub>9</sub>Si<sub>27</sub>O<sub>72</sub> · 32H<sub>2</sub>O) has been refined to a residual wR of 0.044. The erionite framework can be described by a sequence AABAAC … of 6-membered rings of tetrahedra. The (Si, Al) distribution (24% of Al in T1 and 31% of Al in T2) is consistent with the strong disorder found in tetrahedral sites for all zeolites describable by a sequence of 6-rings. Erionite, as in the closely related zeolite offretite, shows a slight enrichment of Al in the single 6-ring. K is at the center of the cancrinite cage and coordinates 6 framework oxygen atoms. Ca atoms alternately occupy three sites, quite near each other, on the triad axis parallel to <em>c</em>, at the center of the erionite cage. Their coordination number varies between 6 and 9. The marked differences in T—O distances found between hydrated and dehydrated erionite are explained in terms of interactions between extraframework ions and framework oxygens.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 5","pages":"Pages 349-352"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00102-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91193242","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}
ZeolitesPub Date : 1997-11-01DOI: 10.1016/S0144-2449(97)00085-7
Isabel Kinski, Hermann Gies, Frank Marlow
{"title":"Ordered and disordered pNA molecules in mesoporous MCM-41","authors":"Isabel Kinski, Hermann Gies, Frank Marlow","doi":"10.1016/S0144-2449(97)00085-7","DOIUrl":"10.1016/S0144-2449(97)00085-7","url":null,"abstract":"<div><p>Para-nitroaniline (pNA) has been incorporated into the one-dimensional channels of mesoporous MCM-41, the hexagonal member of the M41S family of ordered mesoporous silicate materials. The composite material shows a number of remarkable features, depending on the sorption procedure for the organic component, the after treatment, and the annealing time of the composite. In X-ray diffraction experiments different states of one-dimensional ordering of the sorbate molecules in the channel pores are observed. In agreement with the molecular dipole, chain-like coherent domains with the long axis of the sorbate molecule parallel as well as perpendicular to the host channel axis show up. In aged samples the periodic ordering of the pNA molecules is lost, and nonlinear optical properties of the composite have been measured in second harmonic generation experiments indicating the presence of a polar direction in the sample.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 5","pages":"Pages 375-381"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00085-7","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87360393","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}
ZeolitesPub Date : 1997-11-01DOI: 10.1016/S0144-2449(97)00133-4
M. O'Keeffe, S.T. Hyde
{"title":"Vertex symbols for zeolite nets","authors":"M. O'Keeffe, S.T. Hyde","doi":"10.1016/S0144-2449(97)00133-4","DOIUrl":"10.1016/S0144-2449(97)00133-4","url":null,"abstract":"<div><p>Symbols that specify the size and number of shortest rings at the angles of each of the 4-connected vertices of zeolite nets are given. Both the interpretation and the utility of these vertex symbols are discussed.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 5","pages":"Pages 370-374"},"PeriodicalIF":0.0,"publicationDate":"1997-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/S0144-2449(97)00133-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90829045","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}
ZeolitesPub Date : 1997-10-01DOI: 10.1016/S0144-2449(97)00079-1
Se Bok Jang, Mi Suk Jeong, Yang Kim, Karl Seff
{"title":"Crystal structure of an acetylene sorption complex of dehydrated fully Cd2+-exchanged zeolite X","authors":"Se Bok Jang, Mi Suk Jeong, Yang Kim, Karl Seff","doi":"10.1016/S0144-2449(97)00079-1","DOIUrl":"10.1016/S0144-2449(97)00079-1","url":null,"abstract":"<div><p>The crystal structure of an acetylene sorption complex of dehydrated fully Cd<sup>2+</sup>-exchanged zeolite X, Cd<sub>46</sub>Si<sub>100</sub>Al<sub>92</sub>O<sub>384</sub> · 28C<sub>2</sub>H<sub>2</sub> [<em>a</em> = 24.874(5) Å], has been determined by single-crystal X-ray diffraction techniques in the cubic space group <em>Fd</em><span><math><mtext>3</mtext></math></span> at 21(1)°C. Cd<sub>46</sub>−X was dehydrated at 450°C and 2 × 10<sup>−6</sup> Torr for 2 d, followed by exposure to ca. 250 Torr of acetylene gas at 21(1)°C. The structure was determined in this atmosphere and was refined to the final error indices <em>R</em><sub>1</sub> = 0.058 and R<sub>2</sub> = 0.067 with 661 reflections for which <em>I</em> > 3σ(<em>I</em>). In this structure, Cd<sup>2+</sup> ions are found at three crystallographic sites: 13 Cd<sup>2+</sup> ions are at site l, at the centers of the double six-oxygen rings; five Cd<sup>2+</sup> ions lie at site I′, in the sodalite cavity opposite the double six-oxygen rings; and the remaining 28 Cd<sup>2+</sup> ions are at site II, in the supercage near single six-oxygen rings. Each of these 28 is recessed 0.46 Å into the supercage where it coordinates laterally to an acetylene molecule (CC = 1.22(7) Å). These Cd<sup>2+</sup> ions have a distorted tetrahedral environment, 2.192(8) Å from three framework oxygens and 2.79(5)Å from each carbon atom of an acetylene molecule (here counted as a monodentate). As compared to dehydrated Cd<sub>46</sub>−X, five Cd<sup>2+</sup> ions have relocated from sites I and II to I′, as they did in Cd<sub>46</sub>−X · 28CO, primarily for electrostatic reasons.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 4","pages":"Pages 228-237"},"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)00079-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75608117","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}
ZeolitesPub Date : 1997-10-01DOI: 10.1016/S0144-2449(97)00061-4
Michael W. Anderson
{"title":"Simplified description of MCM-48","authors":"Michael W. Anderson","doi":"10.1016/S0144-2449(97)00061-4","DOIUrl":"10.1016/S0144-2449(97)00061-4","url":null,"abstract":"<div><p>A simplified pictorial description is given for the mesoporous inorganic structure MCM-48. Structure, symmetry, and pore architecture are all described in terms of this model.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 4","pages":"Pages 220-227"},"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)00061-4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79639159","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}
ZeolitesPub Date : 1997-10-01DOI: 10.1016/S0144-2449(97)00070-5
Brian J. Schoeman, Brian J. Schoeman
{"title":"Inorganic membranes for separation and reactions","authors":"Brian J. Schoeman, Brian J. Schoeman","doi":"10.1016/S0144-2449(97)00070-5","DOIUrl":"10.1016/S0144-2449(97)00070-5","url":null,"abstract":"","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 4","pages":"Pages 312-313"},"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)00070-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89801891","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}
ZeolitesPub Date : 1997-10-01DOI: 10.1016/S0144-2449(97)00081-X
H. Ghobarkar, O. Schäf
{"title":"The morphology of hydrothermally synthesized gonnardite","authors":"H. Ghobarkar, O. Schäf","doi":"10.1016/S0144-2449(97)00081-X","DOIUrl":"10.1016/S0144-2449(97)00081-X","url":null,"abstract":"<div><p>The hydrothermal treatment of glasses of the composition 5 Na<sub>2</sub>O : 4 CaO : 9 Al<sub>2</sub>O<sub>3</sub> : 22 SiO<sub>2</sub> at 1 kbar pressure in a temperature range between 80°C and 200°C leads to the formation of the zeolite mineral gonnardite (NAT) with orthorhombic symmetry (<em>a</em> = 13.35 Å, <em>b</em> = 13.35 Å, and <em>c</em> = 6.65 Å). The formation of the mineral phase under these equilibrium conditions is restricted to the temperature interval between 80°C and 150°C.</p></div>","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"19 4","pages":"Pages 259-261"},"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)00081-X","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90949365","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}
ZeolitesPub Date : 1997-10-01DOI: 10.1016/S0144-2449(97)00066-3
Z. Bastl, Ludmila Kubelková, J. Nováková
{"title":"XPS study of Pt ammine decomposition in K faujasites : Comparison with bulk behavior","authors":"Z. Bastl, Ludmila Kubelková, J. Nováková","doi":"10.1016/S0144-2449(97)00066-3","DOIUrl":"https://doi.org/10.1016/S0144-2449(97)00066-3","url":null,"abstract":"","PeriodicalId":23983,"journal":{"name":"Zeolites","volume":"102 1","pages":"279-287"},"PeriodicalIF":0.0,"publicationDate":"1997-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79684783","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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