From 1-D to 3-D zeolite structures: performance assessment in catalysis of vapour-phase methanol dehydration to DME

Catizzone, Enrico; Aloise, A.; Migliori, Massimo; Giordano, G.

doi:10.1016/j.micromeso.2017.02.022

Cited by 59 publications

(58 citation statements)

References 86 publications

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“…FER-type crystals with a bulk Si/Al ratio equal to 25 (FER25) were prepared using pyridine as SDA starting from a synthesis gel having a Si/Al molar ratio equal to 30 according to procedure reported by Kamimura et al [39] . FER-type crystals with a bulk Si/Al ratio equal to 45 (FER45) were prepared by using pyridine as SDA and starting from gel Si/Al molar ratio equals to 60 as reported in published procedure [33] . After hydrothermal crystallization for 90 h, the solid was recovered by filtration, washed several times with distilled water and calcined at 550 °C in air flow in order to remove SDA molecules and transformed in the protonic form as detailed elsewhere [33] .…”

Section: Samples Preparationmentioning

confidence: 99%

“…FER-type crystals with a bulk Si/Al ratio equal to 45 (FER45) were prepared by using pyridine as SDA and starting from gel Si/Al molar ratio equals to 60 as reported in published procedure [33] . After hydrothermal crystallization for 90 h, the solid was recovered by filtration, washed several times with distilled water and calcined at 550 °C in air flow in order to remove SDA molecules and transformed in the protonic form as detailed elsewhere [33] . Commercial γ -Al 2 O 3 was purchased in powder-form from Alfa Aesar (UK).…”

Section: Samples Preparationmentioning

confidence: 99%

“…Recent works showed that the zeolite structure (channels opening and orientation) strongly affects catalyst behaviour during methanol dehydration, mainly in terms of deactivation and coke deposition. Among the several zeolite structures investigated until now, TON (1-dimensional 10-membered rings channel system), FER (2-dimensional 8/10-membered rings channel system) and MFI (3-dimensional 10-membered rings channel system) exhibited the best performances in terms of DME selectivity and coke-induced deactivation [32][33][34] . Furthermore, the superiority of FER over other zeolites (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Ferrierite vs. γ-Al2O3: The superiority of zeolites in terms of water-resistance in vapour-phase dehydration of methanol to dimethyl ether

Catizzone

Migliori

Purita

et al. 2019

Journal of Energy Chemistry

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Section: Samples Preparationmentioning

confidence: 99%

Section: Samples Preparationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Ferrierite vs. γ-Al2O3: The superiority of zeolites in terms of water-resistance in vapour-phase dehydration of methanol to dimethyl ether

Catizzone

Migliori

Purita

et al. 2019

Journal of Energy Chemistry

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“…e valorisation of biomass by using zeolites is receiving a growing attention because it opens new ways for application of these materials in low temperature and liquid phase reactions of biomass or biomass-derived compounds [12,13]. Compared with other zeolites such as MFI, BEA, EUO, MTW, the 2-D small/medium pore system of FER-type zeolite inhibits the coke formation and offers high DME selectivity during methanol dehydration reaction [14,15]. In particular, FER-type zeolite with Si/Al � 8-10 exhibits a higher activity and higher TOF than zeolite with higher Si/Al [16].…”

Section: Introductionmentioning

confidence: 99%

Hierarchical Low Si/Al Ratio Ferrierite Zeolite by Sequential Postsynthesis Treatment: Catalytic Assessment in Dehydration Reaction of Methanol

Catizzone

Migliori

Aloise

et al. 2019

Journal of Chemistry

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In contrast to high silica zeolites, it is difficult to obtain mesoporosity in zeolites with low Si/Al ratio (e.g., <20) via conventional NaOH-based treatment, making the obtainment of hierarchical zeolites with high acidity a challenging target. In this paper, we report the preparation of hierarchical FER-type zeolite at low Si/Al molar ratio (about 10) by postsynthesis etching involving a sequence of three treatments with NaAlO 2 , HCl, and NaOH solutions and investigate the effect of both NaAlO 2 solution concentration and time of treatment on the textural properties. e obtained materials exhibit a mesoporous volume higher than the parent ferrierite with no significant effect on the sample acidity. e catalytic activity of some samples was investigated in vapour-phase methanol dehydration to dimethyl ether, revealing the superiority of hierarchical zeolites in terms of methanol conversion, although the presence of mesopores causes formation of light hydrocarbons at high temperatures.

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“…e dehydration reaction using zeolites has long been well understood [38][39][40][41][42][43][44] and it can be carried out in acidic as well as alkaline media. However, preference is given to acid catalysts in the literature [45][46][47][48][49].…”

Section: Zeolite Catalyzed Dehydrationmentioning

confidence: 99%

Overview of Current and Future Perspectives of Saudi Arabian Natural Clinoptilolite Zeolite: A Case Review

Alsawalha

2019

Journal of Chemistry

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After a thorough review of existing studies of clinoptilolite zeolites, three areas for potential investigation of the Saudi Arabian zeolites were found. They are the characterizations, the catalytic activity, active sites, and uses of natural clinoptilolite zeolites. First, no analysis is available worldwide to compare the percentage weight of local zeolites with those sourced from other countries, nor does one exist for the establishment on the zeolite conversion of MBOH with water on acidic catalysts at lower temperatures. Secondly, a review of current literature on the topic revealed that basic and active sites of Saudi Arabian zeolites have yet to be examined. Future investigation of zeolite catalytic activity can be achieved by methyl butynol test reaction (MBOH) and absorption-desorption of ammonia. In the characterization of a range of international materials, the methyl butynol test reaction was utilized, including on natural zeolites, natural clays, and synthesized hydrotalcites. However, the catalytic performance of natural Saudi Arabian clinoptilolite zeolites by test reaction of MBOH conversion has not been yet investigated. Therefore, this article also includes an outline of the general testing conditions and parameters required to execute the accurate characterization of local Saudi clinoptilolite under optimal test conditions. Likewise, knowledge of the important active acidic centers of local materials is prescribed. This can be ascertained by determining the conditions together with the test parameters for the application of the “temperature-programmed desorption of ammonia” method in order to obtain an accurate determination of local Saudi clinoptilolite acidic centers. Additionally, an outline of the catalytic activity of worldwide clinoptilolite is given in this article together with kinetic investigations of other sources for the clinoptilolite zeolite in order to form the basis for the testing of local Saudi clinoptilolite. The percentage average of chemical composition (Wt.%) of natural clinoptilolite from various countries is also included. Finally, a future research plan is proposed here. This will form the basis for a complete study or survey to be compiled detailing the modifications needed to increase the surface areas for Saudi natural clinoptilolite zeolites using different methods of modifications. This could enhance its application as acid catalysts for use in the retardation of coke formation and for membrane separation on cationic exchange.

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From 1-D to 3-D zeolite structures: performance assessment in catalysis of vapour-phase methanol dehydration to DME

Cited by 59 publications

References 86 publications

Ferrierite vs. γ-Al2O3: The superiority of zeolites in terms of water-resistance in vapour-phase dehydration of methanol to dimethyl ether

Ferrierite vs. γ-Al2O3: The superiority of zeolites in terms of water-resistance in vapour-phase dehydration of methanol to dimethyl ether

Hierarchical Low Si/Al Ratio Ferrierite Zeolite by Sequential Postsynthesis Treatment: Catalytic Assessment in Dehydration Reaction of Methanol

Overview of Current and Future Perspectives of Saudi Arabian Natural Clinoptilolite Zeolite: A Case Review

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