Coke location in microporous and hierarchical ZSM-5 and the impact on the MTH reaction

Schmidt, Franz; Hoffmann, Claudia; Giordanino, Filippo; Bordiga, Silvia; Simon, Paul; Carrillo‐Cabrera, W.; Kaskel, Stefan

doi:10.1016/j.jcat.2013.07.020

Cited by 163 publications

(114 citation statements)

References 34 publications

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“…The improved stability towards deactivation of mesoporous zeolites is generally explained by a facilitated molecular transport, 28 along with a higher external surface area that provides more space for coke deposition. 29,30 On the other hand an increased selectivity to propylene can be explained by the decreased concentration of acid sites, the latter being also responsible for the improved lifetimes. and ethylene for all samples.…”

mentioning

confidence: 99%

Structure–performance descriptors and the role of Lewis acidity in the methanol-to-propylene process

et al. 2018

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mentioning

confidence: 99%

Structure–performance descriptors and the role of Lewis acidity in the methanol-to-propylene process

et al. 2018

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“…Schmidt et al 43 prepared hierarchical ZSM-5 zeolite via the desilication reassembly technique for MTH conversion. They found that in addition to a longer lifetime, hierarchical ZSM-5 shows a distinctively different deactivation/reactivation behavior from that of conventional ZSM-5.…”

Section: Introductionmentioning

confidence: 99%

Investigating the Influence of Mesoporosity in Zeolite Beta on Its Catalytic Performance for the Conversion of Methanol to Hydrocarbons

et al. 2015

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Hierarchically porous zeolite Beta (Beta-MS) synthesized by a soft-templating method contains remarkable intra-crystalline mesoporosity, which reduces the diffusion length in zeolite channels down to several nanometers and alters the distribution of Al among distinct crystallographic sites. When used as a catalyst for the conversion of methanol to hydrocarbons (MTH) at 330 o C, Beta-MS exhibited a 2.7-fold larger conversion capacity, a 2.0-fold faster reaction rate, and a remarkably longer lifetime than conventional zeolite Beta (Beta-C). The superior catalytic performance of Beta-MS is attributed to its hierarchical structure, which offers full accessibility to all catalytic active sites. In contrast, Beta-C was easily deactivated because a layer of coke quickly deposited on the outer surfaces of the catalyst crystals, impeding access to interior active sites. This difference is clearly demonstrated by using electron microscopy combined with electron energy loss spectroscopy to probe the distribution of coke in the deactivated catalysts. At both low and high conversions, ranging from 20% to 100%, Beta-MS gave higher selectivity towards higher aliphatics (C 4 -C 7 ) but lower ethene selectivity compared to Beta-C. Therefore, we conclude that a hierarchical structure decreases the residence time of methylbenzenes in zeolite micropores, disfavoring the propagation of the aromatic-based catalytic cycle. This conclusion is consistent with a recent report on ZSM-5 and is also strongly supported by our analysis of soluble coke species residing in the catalysts.Moreover, we identified an oxygen-containing compound, 4-methyl-benzaldehyde, in the coke, which has not been observed in the MTH reaction before.

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“…The hierarchical catalysts were also stable for 140 h, while the conventional catalyst quickly decayed within 30 h due to significant coke depositions. Several alcohol upgrading studies have revealed that hierarchical catalyst systems are better candidates for the production of liquid gasoline-like and olefinic hydrocarbons compared to their conventional counterparts [213][214][215] and are usually associated with improved stability due to enhanced resistance to coking [216].…”

Section: Materials Perspective In Catalyst Design For Fast Pyrolysismentioning

confidence: 99%

In situ fast pyrolysis of biomass with zeolite catalysts for bioaromatics/gasoline production: A review

Galadima

Muraza

2015

Energy Conversion and Management

218

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Coke location in microporous and hierarchical ZSM-5 and the impact on the MTH reaction

Cited by 163 publications

References 34 publications

Structure–performance descriptors and the role of Lewis acidity in the methanol-to-propylene process

Structure–performance descriptors and the role of Lewis acidity in the methanol-to-propylene process

Investigating the Influence of Mesoporosity in Zeolite Beta on Its Catalytic Performance for the Conversion of Methanol to Hydrocarbons

In situ fast pyrolysis of biomass with zeolite catalysts for bioaromatics/gasoline production: A review

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