Catalytic activities and structures of silicalite-1/H-ZSM-5 zeolite composites

Vu, Dung Van; Miyamoto, Manabu; Nishiyama, Norikazu; Ichikawa, Satoshi; Egashira, Yasuyuki; Ueyama, Korekazu

doi:10.1016/j.micromeso.2007.12.034

Cited by 91 publications

(62 citation statements)

References 13 publications

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“…The toluene conversion remained high even after the coating suggesting catalyst protection against coke formation on the one side and evidencing the positive effect of the thin membrane layer over the crystals on the other side if compared to the relatively thick membrane reported early by Nishiyama et al [245]. Moreover, FE-SEM and TEM screening indicated that the pores of silicalite-1 were directly connected to the pores of H-ZSM-5 considered as the main reason for the obtained high selectivity and activity [247]. Additionally, the effect of the H-ZSM-5 crystal size was studied revealing a slight decline in the para-selectivity with increasing crystal size, thus pointing out the severity of silicalite layer defect-free growth on larger crystals.…”

Section: Zeolite Membrane Coatings On Catalyst Particlessupporting

confidence: 63%

“…The proposed model for the formation of the silicalite-1 layer on ZSMystals is illustrated in Figure 11 [269]. Silicalite-1 crystals grow on the ZSM-5 crystal surfac rpendicular to the a and c axes under hydrothermal conditions at 453 K for 24 h without agitation this context, the benefit of silicalite zeolite membrane coated on H-ZSM-5 crystals was evidenced fo e selective p-xylene formation in alkylation of toluene with methanol [246,247,269]. The obtaine ra-selectivity of up to 99.9% was attributed to the suppressed further isomerization of p-xylene sinc e silicalite coating reduced the acid sites on the external surface of the H-ZSM-5 catalyst.…”

Section: Zeolite Membrane Coatings On Catalyst Particlesmentioning

confidence: 99%

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Zeolite Catalysis

2016

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Section: Zeolite Membrane Coatings On Catalyst Particlessupporting

confidence: 63%

Section: Zeolite Membrane Coatings On Catalyst Particlesmentioning

confidence: 99%

Zeolite Catalysis

2016

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“…189 Such an effect for instance was found for a silicalite-1/ZSM-5 core-shell material catalysing the selective synthesis of p-xylene from toluene. 190,191 Various combinations of zeolite structures were reported to form such zeolite-core/ zeolite-shell materials, such as beta/ZSM-5, 192,193 …”

Section: Core-shell Compositesmentioning

confidence: 99%

Hierarchy concepts: classification and preparation strategies for zeolite containing materials with hierarchical porosity

et al. 2016

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'Hierarchy' is a property which can be attributed to a manifold of different immaterial systems, such as ideas, items and organisations or material ones like biological systems within living organisms or artificial, man-made constructions. The property 'hierarchy' is mainly characterised by a certain ordering of individual elements relative to each other, often in combination with a certain degree of branching.Especially mass-flow related systems in the natural environment feature special hierarchically branched patterns. This review is a survey into the world of hierarchical systems with special focus on hierarchically porous zeolite materials. A classification of hierarchical porosity is proposed based on the flow distribution pattern within the respective pore systems. In addition, this review might serve as a toolbox providing several synthetic and post-synthetic strategies to prepare zeolitic or zeolite containing material with tailored hierarchical porosity. Very often, such strategies with their underlying principles were developed for improving the performance of the final materials in different technical applications like adsorptive or catalytic processes. In the present review, besides on the hierarchically porous allzeolite material, special focus is laid on the preparation of zeolitic composite materials with hierarchical porosity capable to face the demands of industrial application.

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“…Silicalite-1 crystals grow on the ZSM-5 crystal surface perpendicular to the a and c axes under hydrothermal conditions at 453 K for 24 h without agitation. In this context, the benefit of silicalite zeolite membrane coated on H-ZSM-5 crystals was evidenced for the selective p-xylene formation in alkylation of toluene with methanol [246,247,269]. The obtained para-selectivity of up to 99.9% was attributed to the suppressed further isomerization of p-xylene since the silicalite coating reduced the acid sites on the external surface of the H-ZSM-5 catalyst.…”

Section: Application In Reactant-selective or Product-selective Reactmentioning

confidence: 99%

Zeolite Membranes in Catalysis—From Separate Units to Particle Coatings

Dragomirova

Wohlrab

2015

Catalysts

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Literature on zeolite membranes in catalytic reactions is reviewed and categorized according to membrane location. From this perspective, the classification is as follows: (i) membranes spatially decoupled from the reaction zone; (ii) packed bed membrane reactors; (iii) catalytic membrane reactors and (iv) zeolite capsuled catalyst particles. Each of the resulting four chapters is subdivided by the kind of reactions performed. Over the whole sum of references, the advantage of zeolite membranes in catalytic reactions in terms of conversion, selectivity or yield is evident. Furthermore, zeolite membrane preparation, separation principles as well as basic considerations on membrane reactors are discussed.

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Catalytic activities and structures of silicalite-1/H-ZSM-5 zeolite composites

Cited by 91 publications

References 13 publications

Zeolite Catalysis

Zeolite Catalysis

Hierarchy concepts: classification and preparation strategies for zeolite containing materials with hierarchical porosity

Zeolite Membranes in Catalysis—From Separate Units to Particle Coatings

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