Ethanol to higher hydrocarbons over Ni, Ga, Fe-modified ZSM-5: Effect of metal content

Borght, Kristof Van der; Galvita, Vladimir; Marin, Guy

doi:10.1016/j.apcata.2014.12.020

Cited by 94 publications

(53 citation statements)

References 43 publications

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“…This validation was done for the most severe operation conditions, being the highest temperature used in this study. and fixed ethanol partial pressure (pEtOH) of 10 kPaAs can be seen from Figure 6, the lowest metal containing ZSM-5 exhibited a higher activity compared to the parent H-ZSM-5 (Si/Al = 15) [40]. As the metal content increases, the activity decreases in a similar manner as it occurs with an increasing Si/Al ratio.…”

Section: Case Study: Ethanol Conversion To Hydrocarbonssupporting

confidence: 54%

“…The application of the proposed information-driven catalyst design methodology and the use of the corresponding set-ups is illustrated by the efforts related to (bio)ethanol conversion to hydrocarbons [40]. Ethanol conversion to hydrocarbons on H-ZSM-5 opens up perspectives for a sustainable light olefins production such as ethene and propene, which are the key building blocks for polyethene and polypropene.…”

Section: Case Study: Ethanol Conversion To Hydrocarbonsmentioning

confidence: 99%

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Information-Driven Catalyst Design Based on High-Throughput Intrinsic Kinetics

et al. 2015

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Abstract:A novel methodology is presented for more comprehensive catalyst development by maximizing the acquired information rather than relying on statistical methods or tedious, elaborate experimental testing. Two dedicated high-throughput kinetics (HTK) set-ups are employed to achieve this objective, i.e., a screening (HTK-S) and a mechanistic investigation one (HTK-MI). While the former aims at evaluating a wide range of candidate catalysts, a limited selection is more elaborately investigated in the latter one. It allows focusing on an in-depth mechanistic analysis of the reaction mechanism resulting in so called "kinetic" descriptors and on the effect of key catalysts properties, also denoted as "catalyst" descriptors, on the catalyst performance. Both types of descriptors are integrated into a (micro)kinetic model that allows a reliable extrapolation towards operating conditions and catalyst properties beyond those included in the high-throughput testing. A case study on ethanol conversion to hydrocarbons is employed to illustrate the concept behind this methodology. The methodology is believed to be particularly useful for potentially large-scale chemical reactions.

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Section: Case Study: Ethanol Conversion To Hydrocarbonssupporting

confidence: 54%

Section: Case Study: Ethanol Conversion To Hydrocarbonsmentioning

confidence: 99%

Information-Driven Catalyst Design Based on High-Throughput Intrinsic Kinetics

et al. 2015

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“…In the impregnation of HZSM-5 with ferrous nitrate, iron was dispersed on HZSM-5 as Fe2O3. For this catalyst, there were two reduction peaks: the first peak at 300-400 °C was related to the transformation of Fe2O3 to Fe3O4 [42], and the second peak at 400-700 °C was related to reduction of Fe3O4 to Fe 0 . The iron in the lattice was not reducible.…”

Section: H2-tpr Analysismentioning

confidence: 94%

Oxidative Dehydrogenation of Liquefied Petroleum Gas on Copper, Zinc and Iron Oxide Impregnated on MFI Zeolite Assisted by Electric Power

Alamdari

Karimzadeh

2018

Catalysts

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Olefin was produced with a non-conventional method using an electric field exerted on zeolites. The lattice oxygen mobility increases with a decrease in band gap, leading to an increase in olefin yield. By impregnating the transition metal, an increase in carrier concentration occurs. The external electric field changes the Fermi level. In this research, HZSM-5 was placed in an external DC electric field with strength appropriate for studying its catalytic performance. The Fermi level changed with the metal type and the external electric field. The increase in permittivity with temperature extracts higher energy from the external electric field. In catalytic reactions assisted by the external DC electric field, at 510 • C, the yield was approximately equal to the yield in a conventional reaction at 650 • C. With regard to TGA, in the catalytic reaction assisted by the external DC electric field, the produced coke declined. The results showed that the maximum yield value (50.54%) and conversion (92.81%) were be obtained at 650 • C with an input electrical current of 12 mA, a gap distance of 10 mm and a metal loading of 4 wt. % over FeHZSM-5.

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“…A whole series of zeolite lattices is known, each with their own unique structure often leading to differences in selectivity with a change of zeolite lattice for a specific type of reaction [22,[25][26][27]. These catalysts have shown to be suitable for the acid-catalyzed dehydration of ethanol and butanol [4,[28][29][30][31]. Prior work suggests the same reaction mechanism holds for a range of acidic zeolites on the dehydration of alcohols.…”

Section: Introductionmentioning

confidence: 99%

Study of n-butanol conversion to butenes: Effect of Si/Al ratio on activity, selectivity and kinetics

Gunst

Sabbe

Reyniers

et al. 2019

Applied Catalysis A: General

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As bio-butanol is gaining more and more interest as a commercially available bioresource, the dehydration of this alcohol towards butenes and higher carbons gains more of interest. In general HZSM-5 has shown to be the most promising catalyst for this conversion. The role of the zeolite's Si/Al ratio in the butanol dehydration reaction is still not fully understood. Experimental data obtained for a series of HZSM-5 with decreasing Si/Al ratio revealed an increase in activity of the catalyst per active site without affecting the selectivity profile. To understand the underlying effects, a microkinetic model was constructed for H-ZSM-5 with a Si/Al ratio of 25, based on literature DFT calculations, and the model was further modified by fitting the key parameters to the measured data at the four different temperatures studied in this work. This resulted in an adequate model for the dehydration of butanol across the evaluated temperature range of 503K to 533K. Investigation of the occurring mechanisms indicated a inhibiting effect due to the strong adsorption of din -butylether. This 'poisoning' of the catalyst surface resulted in a peculiar S-like curve for the conversion site time relation, which was also experimentally observed. This newly fitted base model was used to obtain more insight in the effect of the Si/Al ratio by implementing an additional H parameter, which is related to the adsorption strength of n-butanol in the base model. H varies between-4.8 to +11.3 kJ/mol and provides a good fit for Si/Al ratios ranging from 15 to 140. The higher dehydration rates observed with decreasing Si/Al can be traced back to an increase in adsorption strength resulting in an overall increase in surface coverage. The constant selectivity-conversion profile can be explained by a similar dependency of all elementary steps on the adsorption strength. The model developed in this study enables to simulate and understand the experimentally observed effects of temperature and Si/Al ratio on the n-butanol dehydration.

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Ethanol to higher hydrocarbons over Ni, Ga, Fe-modified ZSM-5: Effect of metal content

Cited by 94 publications

References 43 publications

Information-Driven Catalyst Design Based on High-Throughput Intrinsic Kinetics

Information-Driven Catalyst Design Based on High-Throughput Intrinsic Kinetics

Oxidative Dehydrogenation of Liquefied Petroleum Gas on Copper, Zinc and Iron Oxide Impregnated on MFI Zeolite Assisted by Electric Power

Study of n-butanol conversion to butenes: Effect of Si/Al ratio on activity, selectivity and kinetics

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