Mesopore formation in zeolite H-SSZ-13 by desilication with NaOH

Sommer, Linn; Mores, Davide; Svelle, Stian; Stöcker, Michael; Weckhuysen, Bert M.; Olsbye, Unni

doi:10.1016/j.micromeso.2010.03.017

Cited by 155 publications

(91 citation statements)

References 58 publications

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“…Recently, the SSZ-13 zeolite has attracted much attention because of its various applications in catalysis (such as DeNO x [1,2] and propylene production from ethylene [3], methanol-to-olefin [4]) and CO 2 adsorption [5,6]. SSZ-13 zeolites have been synthesized via various methods, including direct synthesis (from precursors of silica and alumina) and conversion of zeolite Y.…”

Section: Introductionmentioning

confidence: 99%

“…The propylene selectivity increased with decreasing ethylene conversion (or increasing time-on-stream, TOS) over SSZ-13 and SAPO-34, as fresh catalysts are highly active in hydrogen transfer to form propane[34]. The maximum propylene yield was obtained within a certain reaction time(2)(3)(4) h) because the propylene selectivity increased and ethylene conversion decreased with increasing TOS.The effect of the SSZ-13 preparation methods on the ETP performances was checked using SSZ-13(30)s prepared with CE and MW. As shown inFig.…”

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confidence: 98%

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Conversion of Y into SSZ-13 zeolites and ethylene-to-propylene reactions over the obtained SSZ-13 zeolites

Jun

Khan

Seo

et al. 2016

Chemical Engineering Journal

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 98%

Conversion of Y into SSZ-13 zeolites and ethylene-to-propylene reactions over the obtained SSZ-13 zeolites

Jun

Khan

Seo

et al. 2016

Chemical Engineering Journal

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“…These studies mainly employed H-ZSM-5-and SAPO-34-type catalysts. [15][16][17][18] Studying the location and the chemical nature of the formed coke species requires powerful analytical methods. In previous work, we showed that in situ UV/Vis and fluorescence microscopy allow the spatiotemporal investigation of the rate and composition of coke formation in individual H-ZSM-5 and H-SAPO-34 crystals.…”

Section: Introductionmentioning

confidence: 99%

Coke Formation during the Methanol‐to‐Olefin Conversion: In Situ Microspectroscopy on Individual H‐ZSM‐5 Crystals with Different Brønsted Acidity

Kornatowski

Olsbye

et al. 2011

Chemistry A European J

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Coke formation during the methanol-to-olefin (MTO) conversion has been studied at the single-particle level with in situ UV/Vis and confocal fluorescence microscopy. For this purpose, large H-ZSM-5 crystals differing in their Si/Al molar ratio have been investigated. During MTO, performed at 623 and 773 K, three major UV/Vis bands assigned to different carbonaceous deposits and their precursors are observed. The absorption at 420 nm, assigned to methyl-substituted aromatic compounds, initiates the buildup of the optically active coke species. With time-on-stream, these carbonaceous compounds expand in size, resulting in the gradual development of a second absorption band at around 500 nm. An additional broad absorption band in the 600 nm region indicates the enhanced formation of extended carbonaceous compounds that form as the reaction temperature is raised. Overall, the rate of coke formation decreases with decreasing aluminum content. Analysis of the reaction kinetics indicates that an increased Brønsted acid site density facilitates the formation of larger coke species and enhances their formation rate. The use of multiple excitation wavelengths in confocal fluorescence microscopy enables the localization of coke compounds with different molecular dimensions in an individual H-ZSM-5 crystal. It demonstrates that small coke species evenly spread throughout the entire H-ZSM-5 crystal, whereas extended coke deposits primarily form near the crystal edges and surfaces. Polarization-dependent UV/Vis spectroscopy measurements illustrate that extended coke species are predominantly formed in the straight channels of H-ZSM-5. In addition, at higher temperatures, fast deactivation leads to the formation of large aromatic compounds within channel intersections and at the external zeolite surface, where the lack of spatial restrictions allows the formation of graphite-like coke.

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“…However, the success was very limited and lifetime of the material was not improved. 42 In contrast, the catalytic performance of SSZ-13 was enhanced after neutron irradiation that induced structural defects. 43 The use of CTAB (hexadecyl trimethyl ammonium bromide) as growth modifier in the synthesis of SSZ-13 has been recently explored by Kumar et al 44 resulting in a decrease in the size of the crystal, and, Hensen et al have applied different co-templates for the synthesis of SSZ-13, showing increased mesoporosity and lifetime for SSZ-13.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nano-SSZ-13 and its application in the reaction of methanol to olefins

Navarro

Martínez‐Triguero

et al. 2016

Catal. Sci. Technol.

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Nanosized SSZ-13 has been obtained from a one-pot synthesis procedure with the addition of CTAB to the synthesis precursor solution. Nano-SSZ-13 zeolite showed high intracrystalline mesoporosity and comparing to standard SSZ-13 presented much longer lifetime and higher conversion capacity for the reaction of methanol to olefins. The improved properties were attributed to a more efficient utilization of microporosity by easier diffusion of reactants and products and slower deactivation by coke. A higher C2/C3 ratio was found for nano-SSZ-13 pointing to a lower deactivation of the aromatics cycle of the hydrocarbon pool.

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Mesopore formation in zeolite H-SSZ-13 by desilication with NaOH

Cited by 155 publications

References 58 publications

Conversion of Y into SSZ-13 zeolites and ethylene-to-propylene reactions over the obtained SSZ-13 zeolites

Conversion of Y into SSZ-13 zeolites and ethylene-to-propylene reactions over the obtained SSZ-13 zeolites

Coke Formation during the Methanol‐to‐Olefin Conversion: In Situ Microspectroscopy on Individual H‐ZSM‐5 Crystals with Different Brønsted Acidity

Synthesis of nano-SSZ-13 and its application in the reaction of methanol to olefins

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