Characterization of Beta/MCM-41 composite molecular sieve compared with the mechanical mixture

Guo, Wanping; Huang, Limin; Deng, Peng; Xue, Zhixin; Li, Quanzhi

doi:10.1016/s1387-1811(01)00217-7

Cited by 135 publications

(88 citation statements)

References 29 publications

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“…In the original work of Brunauer, Emmett and Tellerit was found that type II nitrogen isotherms (according to the IUPAC classification [10]) on various nonporous adsorbents gave linear BET plots over the approximate range p/p°-0.05 -0.3. The specific surface area S can then be obtained from the monolayer capacity n m by the application of the simple equation: S = N m Lr, where L is the Avogadro constant and r is the so-called crosssectional area (the average area occupied by each molecule in a completed monolayer).…”

Section: Application Of the Bet (Brunauer Emmett And Teller) Methodsmentioning

confidence: 99%

Physical Adsorption Characterization of Nanoporous Materials

Thommes¹

2010

Chemie Ingenieur Technik

1,251

557

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During recent years, major progress has been made in the understanding of the adsorption, pore condensation and hysteresis behavior of fluids in novel ordered nanoporous materials with well defined pore structure. This has led to major advances in the structural characterization by physical adsorption, also because of the development and availability of advanced theoretical procedures based on statistical mechanics (e.g., density functional theory, molecular simulation) which allows to describe adsorption and phase behavior of fluids in pores on a molecular level. Very recent improvements allow even to take into account surface geometrical in-homogeneity of the pore walls However, there are still many open questions concerning the structural characterization of more complex porous systems. Important aspects of the major underlying mechanisms associated with the adsorption, pore condensation and hysteresis behavior of fluids in micro-mesoporous materials are reviewed and their significance for advanced physical adsorption characterization is discussed.

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Section: Application Of the Bet (Brunauer Emmett And Teller) Methodsmentioning

confidence: 99%

Physical Adsorption Characterization of Nanoporous Materials

Thommes¹

2010

Chemie Ingenieur Technik

1,251

557

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“…Some composite zeolite, such as β/MCM-41 [11], ZSM-5/Y [12,13] and MAZ/ZSM-5 [14] have been reported exhibiting obvious synergic effect in catalysis. FAU/LTA was observed by Mintova and Valtchev [10] in their early synthesis of FAU nanozeolite.…”

Section: Introductionmentioning

confidence: 99%

Phase selection controlled by sodium ions in the synthesis of FAU/LTA composite zeolite

Xie

Wang

et al. 2009

Science and Technology of Advanced Materials

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O] increases from 0.024 to 0.168, the product gradually changes from pure FAU to pure LTA via the formation of FAU/LTA composite with increasing LTA fraction. Interestingly, the induction periods of FAU and LTA in the FAU/LTA composite zeolite ([Na 2 O] is 0.072) are both 13 h, quite different from the induction periods of their individual pure phases-45 h for FAU and 4 h for LTA. During the crystallization, the LTA/(FAU + LTA) fraction in the composite zeolite decreases in a nearly linear fashion. Scanning electron microscopy, thermogravimetry and differential thermal analysis indicate some difference between the properties of the FAU/LTA composite zeolite and of the mechanical mixture.

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“…In the second approach, syntheses have been investigated in which highly ordered mesoporous structures have been generated by means of the self-assembly of pre-formed clusters of zeolite nuclei with surfactant micelles as templates. [13][14][15] This approach requires clusters of no more than a few nanometers in diameter, or even smaller zeolite nuclei, as a part of building units to form mesoporous structures, since otherwise no well-defined mesostructures are formed. However, these small clusters or nuclei easily loose their integrity during activation through calcination at high temperatures.…”

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confidence: 99%

Zeolite Nanocrystals Inside Mesoporous TUD‐1: A High‐Performance Catalytic Composite

Waller¹,

Shan²,

Marchese

et al. 2004

Chemistry A European J

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A hierarchically structured composite material with interconnecting meso- and micropores has been developed with the aim to optimize zeolite performance. A general synthetic method has been developed that, in a controlled manner, allows for various types of nanosized zeolite to be incorporated into a three-dimensional mesoporous matrix. Nanosized zeolite Beta was used to exemplify this new approach, resulting in a system in which zeolite Beta shows a higher cracking activity per gram of zeolite than pure nanosized zeolite Beta for the model feed n-hexane. Additionally, FTIR studies of CO and NH3 adsorption revealed that the nature of the acid sites in the nanozeolite has been partially modified due to the interactions with the mesoporous matrix, TUD-1.

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Characterization of Beta/MCM-41 composite molecular sieve compared with the mechanical mixture

Cited by 135 publications

References 29 publications

Physical Adsorption Characterization of Nanoporous Materials

Physical Adsorption Characterization of Nanoporous Materials

Phase selection controlled by sodium ions in the synthesis of FAU/LTA composite zeolite

Zeolite Nanocrystals Inside Mesoporous TUD‐1: A High‐Performance Catalytic Composite

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