Determination of the Pore Topology of Zeolite IM-5 by Means of Catalytic Test Reactions and Hydrocarbon Adsorption Measurements

Corma, Avelino; Chica, Antonio; Guil, J.M.; Llopis, Francisco J.; Mabilon, G.; Perdigón-Melón, José Antonio; Valencia, Susana

doi:10.1006/jcat.1999.2718

Cited by 80 publications

(45 citation statements)

References 20 publications

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“…The patterns exhibited the same characteristics as described in Ref. [18], which indicated that using mesoporous silica SBA-15 and MCM-48 as the silica sources in the synthesis gels did not affect the formation of well-ordered IM-5 zeolites. Although the crystallinity of the IM-5 samples reduced after the physical mixing process, the framework of zeolites was retained.…”

Section: Catalytic Evaluationsupporting

confidence: 72%

“…Recently, the catalytic behaviors of IM-5 zeolite in shape-selective catalysis, xylene isomerization-disproportionation, hydrocarbon cracking, and selective catalytic reduction of nitric oxides have been investigated [18][19][20][21]. Moreover, the creation of a proper mesoporosity in the zeolite system has been achieved through various ways, such as the post-treatment method and the template method.…”

Section: Introductionmentioning

confidence: 99%

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Improved performance of hierarchical porous Mo/H-IM-5 catalyst in methane non-oxidative aromatization

Liu

Kan

2017

Appl Petrochem Res

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Two novel hierarchical porous IM-5-S and IM-5-M materials were synthesized using mesoporous silica SBA-15 and MCM-48 as the silica sources, and for comparison conventional IM-5-C zeolite was also synthesized with the same synthesis composition. IM-5-S and IM-5-M samples exhibited larger crystal sizes and different textural properties than the conventional IM-5-C zeolite. Moreover, Mo-modified catalysts, Mo-IM-5-S, Mo-IM-5-M, and Mo-IM-5-C, were prepared for the non-oxidative aromatization of methane. The physical properties and acidities of the samples were characterized by XRD, SEM, TEM, BET, and NH 3 -TPD. Compared with Mo-IM-5-C, the Mo-IM-5-S and Mo-IM-5-M catalysts showed higher yields of aromatics and better stabilities. The preferable catalytic behaviors of Momodified mesoporous IM-5 catalysts may be attributed to the generation of secondary mesoporous systems within the zeolite crystals, which may influence the location and state of the active Mo species, simultaneously lead to easier access to the active sites for reactants and be favorable for the diffusion of products formed in the microporous channels during the methane aromatization reaction.

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Section: Catalytic Evaluationsupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Improved performance of hierarchical porous Mo/H-IM-5 catalyst in methane non-oxidative aromatization

Liu

Kan

2017

Appl Petrochem Res

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“…Using other aluminum sources or under agitation, amorphous products or mordenite were formed. The size and shape of crystals are similar to those one in [25], but Lee et al [11] obtained IMF using aluminum nitrate with the shape of crystals as rods.…”

Section: Synthesismentioning

confidence: 79%

TUN, IMF and -SVR Zeolites; Synthesis, Properties and Acidity

2010

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The effect of synthesis conditions on the preparation and properties of three novel zeolites TUN, IMF, and -SVR was investigated and compared with MFI. X-ray powder diffraction, infrared spectroscopy, chemical analysis, sorption measurements, and scanning electron microscopy were employed to characterize the textural and chemical properties of these zeolites. FTIR spectroscopy in combination with pyridine as probe molecule was used to describe the type, concentration and acid strength of these zeolites. Zeolite -SVR was synthesized with Si/Al ratios higher than 100 in contrast with TUN and IMF having Si/ Al ratios about 20-30, respectively. TUN, MFI and IMF zeolites exhibit similar concentrations of Brønsted and Lewis acid sites and also similar acid strength of Brønsted sites. In contrast, the presence of one vacancy/unit cell in the case of -SVR zeolite substantially changes its acidic properties. Generally, zeolites TUN and IMF exhibit similar acidic properties in terms of acid strength and Brønsted to Lewis acid site ratio like MFI and due to their slightly larger pores higher activities in catalytic reactions are expected.

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“…In spite of the difference in selectivity for all Pt/SAPO-11 catalysts, monobranched isomers are the dominant species in the product distribution ( Table 4). The preferable formation of mono-branched isomers over the catalysis mainly can be attributed to transition-state shape selectivity of the SAPO-11 zeolites [44]. In the narrow and elliptical channels (0.39 9 0.63 nm), the transition state (carbenium species) towards forming monobrached isomers can be formed easily due to the constraint of void space.…”

Section: Catalytic Performance Of the Catalystsmentioning

confidence: 99%

Controlling Acidic Sites to Improve Hydroisomerization Performance of Pt/SAPO-11 Catalysts

Cui

Liu

2015

Catal Lett

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zeolites with different amount of silicon were synthesized to control the acidic sites of Pt/ SAPO-11 catalysts. The structure, acidity and hydroisomerization performance of the SAPO-11 zeolites were systematically investigated. The results showed that with increase of silicon amount, the relative crystallinity of SAPO-11 apparently decreased and dominant crystal faces were different. BET surface area and total pore volume of the samples can change by difference of phase crystal structure. Amount of framework silicon controls acidic property of the SAPO-11. The more incorporation of silicon in the framework resulted in more medium acidic sites on the samples. The different acidic property of the samples was ascribed to different coordination mode of silicon. There are SM2 and SM3 substitution in the frameworks of the SAPO-11 zeolites. On catalysts of Pt/SAPO-11, more platinum existed in the pores. Platinum dispersion and reduction property were almost duplication for all the catalysts. The conversion of model compound and isomerization selectivity strongly depended on the acidic property of the catalysts. The results demonstrated that the optimum catalysts for hydrocarbon isomerization should remain the balance between metal sites and acidic sites. Graphical AbstractElectronic supplementary material The online version of this article (

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Determination of the Pore Topology of Zeolite IM-5 by Means of Catalytic Test Reactions and Hydrocarbon Adsorption Measurements

Cited by 80 publications

References 20 publications

Improved performance of hierarchical porous Mo/H-IM-5 catalyst in methane non-oxidative aromatization

Improved performance of hierarchical porous Mo/H-IM-5 catalyst in methane non-oxidative aromatization

TUN, IMF and -SVR Zeolites; Synthesis, Properties and Acidity

Controlling Acidic Sites to Improve Hydroisomerization Performance of Pt/SAPO-11 Catalysts

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