Composites of micro- and mesoporous materials: simultaneous syntheses of MFI/MCM-41 like phases by a mixed template approach

Karlsson, Arne; Stöcker, Michael; Schmidt, Ralf

doi:10.1016/s1387-1811(98)00252-2

Cited by 371 publications

(190 citation statements)

References 12 publications

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“…Copyright 2008 Macmillan Publishers Limited conventional micropore SDA such as TPABr. The earliest attempt of soft-templating approach in the synthesis of zeolite was reported with co-addition of quaternary ammonium surfactant such as CTABr with conventional micropore SDA such as TPABr in the zeolite synthesis solution [60]. The expected performance of these two SDAs was to generate both mesoporous and microporous structure within zeolite crystal through cooperative structure-directing actions of two individual SDAs.…”

Section: Soft-templating Routementioning

confidence: 99%

Hierarchically Nanoporous Zeolites and Their Heterogeneous Catalysis: Current Status and Future Perspectives

Somorjai

2014

Catal Lett

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The research field of hierarchically nanoporous zeolites has been growing at an enormous pace over the past decades. Hierarchically nanoporous zeolites have versatile structural properties such as high surface area and large pore volume that can alleviate diffusional limitations of conventional zeolites with solely microporous framework. In this review, various synthesis strategies to hierarchically nanoporous zeolites and their structural advantages in catalytic reactions will be reviewed. In the first part, many novel synthetic approaches for hierarchically nanoporous zeolites such as post-demetallation, softtemplating, hard-templating, and dual-pore-generating surfactant-directed methods will be introduced. In the second part, catalytic applications of hierarchically nanoporous zeolites on various chemical reactions involving isomerization, cracking, alkylation and oxidation will be discussed. The present comprehensive review will provide future opportunities and perspectives on the research of hierarchically nanoporous zeolites including their applications to catalytic reactions.

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Section: Soft-templating Routementioning

confidence: 99%

Hierarchically Nanoporous Zeolites and Their Heterogeneous Catalysis: Current Status and Future Perspectives

Somorjai

2014

Catal Lett

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“…Some of them are based on the modification of the synthesis method such as adding salts to the synthesis gel to facilitate the condensation of silanol groups [12], pH adjustment during the crystallization period [13,14], generating microporous zeolitesmesoporous composites in order to get advantage of the thermal stability and acidity of the zeolites [15,16] and using templates different from those of original MCM-41, such as triblock copolymer surfactants (which allow the preparation of mesoporous structures with thicker walls (ex. SBA-15) [17,18]) or Gemini amine surfactants for the preparation of vesicle-like lamellar frameworks with thick walls and improved hydrothermal stability [19].…”

Section: Introductionmentioning

confidence: 99%

Al-containing MCM-41 type materials prepared by different synthesis methods: Hydrothermal stability and catalytic properties

Lourenço¹,

Fernandes²,

Henriques³

et al. 2006

Microporous and Mesoporous Materials

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Al-containing MCM-41 type materials were prepared by three different synthesis methods (aluminum grafting on the calcined MCM-41, pH adjustment during the crystallization period and crystallization in the presence of zeolite seeds). The samples were characterized by powder XRD, nitrogen adsorption, 27 Al MAS NMR and FTIR with pyridine as probe molecule. All the samples exhibit a high hydrothermal stability at high temperature just with a minor structural degradation. N 2 adsorption data obtained for the sample prepared from a gel containing zeolite seeds suggest a higher structural resistance to the hydrothermal treatment in comparison with the samples prepared by other methods. A different type of pyridine adsorbed, probably interacting simultaneously with a Brönsted and a Lewis acid site, is observed upon pyridine adsorption. This type of adsorption is stronger for the sample prepared in the presence of zeolite seeds and is not observed on Al-grafted MCM-41. 2The catalytic activity towards the isomerization of α-pinene depends mainly on the number of Brönsted acid sites. The data obtained in this study strongly indicate that for this type of materials, the Lewis acid sites do not influence the selectivity for the isomerization products.

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“…Compared with the mechanical mixture, the shift of corresponding IR bands is found for the composite, which is due to the interfacial interactions between the two phases in the composite. 17 Meanwhile, the peak at 781 cm −1 for the mechanical mixture, standing for the symmetric vibration of tetrahedra outer links in Hβ, 18 disappears in the composite. According to Liu et al's report, 18 the symmetric vibration of tetrahedra outer links is sensitive to any change in molecular sieve structure.…”

Section: Resultsmentioning

confidence: 97%

Synthesis of Hβ (core)/SAPO-11 (shell) Composite Molecular Sieve and its Catalytic Performances in the Methylation of Naphthalene with Methanol

Wang¹,

Guo²,

Zhao³

2013

Bulletin of the Korean Chemical Society

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Hβ (core)/SAPO-11 (shell) composite molecular sieve was synthesized by the hydrothermal method in order to combine the advantages of Hβ and SAPO-11 for the methylation of naphthalene with methanol. For comparison, the mechanical mixture was prepared through the blending of Hβ and SAPO-11. The physicochemical properties of Hβ, SAPO-11, the composite and the mechanical mixture were characterized by various characterization methods. The characterization results indicated that Hβ/SAPO-11 composite molecular sieve exhibited a core-shell structure, with the Hβ phase as the core and the SAPO-11 phase as the shell. The pore diameter of the composite was between that of Hβ and SAPO-11. The composite had fewer acid sites than Hβ and mechanical mixture while more acid sites than SAPO-11. The experimental results indicated that the composite exhibited high catalytic performances for the methylation of naphthalene with methanol.

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Composites of micro- and mesoporous materials: simultaneous syntheses of MFI/MCM-41 like phases by a mixed template approach

Cited by 371 publications

References 12 publications

Hierarchically Nanoporous Zeolites and Their Heterogeneous Catalysis: Current Status and Future Perspectives

Hierarchically Nanoporous Zeolites and Their Heterogeneous Catalysis: Current Status and Future Perspectives

Al-containing MCM-41 type materials prepared by different synthesis methods: Hydrothermal stability and catalytic properties

Synthesis of Hβ (core)/SAPO-11 (shell) Composite Molecular Sieve and its Catalytic Performances in the Methylation of Naphthalene with Methanol

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