Characteristics of molecular sorption on template containing mesoporous molecular sieves of type MCM-41

Bobonich, F. M.; Коваленко, А. С.; Voloshina, Yu. G.; Solomakha, V. N.; Korchev, A. S.; Филиппов, А. П.; Il’in, V. G.

doi:10.1007/bf02522794

Theor Exp Chem

1999

DOI: 10.1007/bf02522794

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Characteristics of molecular sorption on template containing mesoporous molecular sieves of type MCM-41

F. M. Bobonich¹,

А. С. Коваленко²,

Yu. G. Voloshina³

et al.

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Cited by 2 publications

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“…The specific surface area S sp of the samples was initially evaluated using the standard thermal nitrogen desorption method with a GKh-1 gasometer [20]. We also studied the acid properties of the samples by IR spectroscopy of pyridine and by the temperature-programmed desorption of ammonia (TPDA).…”

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Effect of Preparation Conditions on Formation and Features of Micro/Mesoporous Composite Materials on Base of Zeolites MCM-22, ZSM-5, and Beta

et al. 2014

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UDC 544.723.21 V. L. Struzhko, P. S. Yaremov, E. V. Senchylo, V. M. Solomakha, and V. G. Ilyin XRD, TPDA, and IR spectroscopy of pyridine were used to study the effect of the synthesis conditions on the formation, adsorption characteristics, and acid properties of composite micro/mesoporous materials. Spatially well-ordered phases such as Beta, were found to exist in our samples. Variation of the preparation conditions permitted us to regulate the porosity and adsorption characteristics of the composite materials and the type, concentration, and strength distribution of the acid sites in the samples. The strength of the acid sites of the composite micro/mesoporous materials and their concentration are much higher than for mesoporous AlSi-MCM-41 but somewhat less than in the initial zeolites. Analysis of the results suggested that the samples obtained under similar conditions are not ordinary mechanical mixtures of two phases (zeolite and AlSi-MCM-41), but rather unique composites with tightly bound nanoparticles due to formation in a single reaction medium.Zeolites are commonly used as catalysts in the petrochemical and petroleum refining industry due largely to their crystal structure, porosity, and acid properties. However, small pore diameter (<0.75 nm) limits their use in the catalytic conversion of bulky molecules, in particular, in extensive catalytic cracking reactions and fine organic synthesis [1]. It was assumed that mesoporous molecular sieves (MMS), in particular, MCM-41-type materials with pore diameter £3-5 nm, possessing high specific surface (up to 1000 m 2 /g) could be used in such and similar processes. However, further investigation showed that the amorphous nature of the framework-forming substance and relatively low condensation lead to weak acidity and relatively low hydrolytic stability. Hence, the development of new materials with hybrid micro/mesoporous structure, combining the advantages of zeolites and MMS, holds considerable interest in regard to their possible application in adsorption and catalytic processes.There are presently several approaches being explored for the preparation of meso/microporous materials. One of them involves the creation of mesopores in zeolite crystals by dealumination and/or disilication upon acid, hydrothermal, or alkaline treatment [2]. Other approaches involve, somewhat generalizing, the preparation of micro/mesoporous composites from precursor zeolite crystal seeds formed in the first stages of the synthesis, the use of delaminated (fragmentized) zeolite particles as construction units, partial zeolitization of the MMS framework upon hydrothermal treatment in the presence of suitable

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Effect of Preparation Conditions on Formation and Features of Micro/Mesoporous Composite Materials on Base of Zeolites MCM-22, ZSM-5, and Beta

et al. 2014

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Discrimination of the saturated vapours of alcohols by the responses of assembly of piezoquartz sensors covered with metal stearates and their complexes with octadecylamine

Филиппов¹

2006

Semicond. phys. quantum electron. optoelectron.

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The sensitivity of sensor assembly based on piezoquartz resonators (PQR) with the chemical coatings of the specified type relatively to the saturated vapours of several lowest alcohols is investigated. As the chemical coatings, some complex compounds of d-transition metals with stearate anion (St-) and octadecylamine (ODA) of the general formula M(ODA) N St 2 were used, where M 2+ are ions of d-transition metals Cu(II), Co(II), Ni(II), and N was equal 0, 2, 4, and 6. The sensor images for each of all alcohols investigated by us has the unique character that can be used for discrimination between individual alcohols by using the set of coatings of PQR sensors applied in this work.

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Characteristics of molecular sorption on template containing mesoporous molecular sieves of type MCM-41

Cited by 2 publications

References 2 publications

Effect of Preparation Conditions on Formation and Features of Micro/Mesoporous Composite Materials on Base of Zeolites MCM-22, ZSM-5, and Beta

Effect of Preparation Conditions on Formation and Features of Micro/Mesoporous Composite Materials on Base of Zeolites MCM-22, ZSM-5, and Beta

Discrimination of the saturated vapours of alcohols by the responses of assembly of piezoquartz sensors covered with metal stearates and their complexes with octadecylamine

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