Light olefin transformation over ZSM-5 zeolites with different acid strengths – A kinetic model

Oliveira, P.G. Pries de; Borges, P.; Pinto, R. Ramos; Lemos, M.A.N.D.A.; Lemos, F.; Védrine, J.C.; Ribeiro, F. Ramôa

doi:10.1016/j.apcata.2010.06.032

Cited by 52 publications

(55 citation statements)

References 43 publications

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“…Oliveiraa et al [13] found that the conversion of ethylene and propylene also decreases with temperature. In a study of 1-butene transformation on a K-modified HZSM-5 by Epelde et al [3,23], the conversion of 1-butene decreases with temperature, too.…”

Section: Negative Temperature Dependence Of Cracking Ratementioning

confidence: 97%

“…The multimolecular reactions, e.g., dimerization, trimerization and etc., of the parent olefin are initiated and followed by the secondary reactions such as isomerization or cracking, yielding a variety of derivative olefins [2,13]. Lin et al [14] found the catalyst acid strength had great effect on the reaction pathways and product distribution for 1-butene over ZSM-5.…”

Section: Introductionmentioning

confidence: 98%

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Reaction pathway and kinetics of C3–C7 olefin transformation over high-silicon HZSM-5 zeolite at 400–490°C

Huang

Aihemaitijiang

Xiao

2015

Chemical Engineering Journal

116

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Section: Negative Temperature Dependence Of Cracking Ratementioning

confidence: 97%

Section: Introductionmentioning

confidence: 98%

Reaction pathway and kinetics of C3–C7 olefin transformation over high-silicon HZSM-5 zeolite at 400–490°C

Huang

Aihemaitijiang

Xiao

2015

Chemical Engineering Journal

116

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“…In many cases, it has been shown that computed activation energies for the main reaction were related linearly with the computed and experimental heat of ammonia adsorption on acid zeolites [120][121][122]. The observed activity was considered as the summation of the activities of the different acid sites weighted by the amount of such sites.…”

Section: Xps Techniquementioning

confidence: 99%

Acid–base characterization of heterogeneous catalysts: an up-to-date overview

Védrine

2015

Res Chem Intermed

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In this overview, we focus on the different and current methods of acidbase characterization of heterogeneous catalysts and on their potential relation with catalytic properties in gas and liquid phases. Special emphasis is drawn on the main techniques currently employed such as the use of Hammett's indicators, the use of basic or acidic probes of different strength for adsorption measurements in microcalorimetry and of their thermal programmed desorption, the use of other techniques such as FTIR, ESR, NMR, photoluminescence, Raman, UV-Vis, and XPS, to identify and describe acid-base sites, the use of model catalytic reactions, and of theoretical/modeling approaches. Relationships between such a characterization and catalytic properties in different acid or base reactions are discussed, and implemented for different catalysts and different reactions. The concept of thermodynamic acidity/basicity (determined via chemical physical characterization) versus reactivity (determined via catalytic properties) of acid-base sites is presented, and explains why relationships between acid-base properties and catalytic properties are very often met but are difficult to be established unambiguously and cannot be generalized. The case of acid-base properties in liquid phase ''polar'' (water, alcohol) and ''apolar'' (cyclohexane) as ''effective'' and ''intrinsic'' properties, respectively, and their relation with catalytic properties in liquid phase are also discussed.Keywords Acid-base properties of solid catalysts Á Related catalytic properties Á Intrinsic versus effective acidity/basicity Á Acidity/basicity in liquid polar or apolar media

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“…The MTG mechanism has been under scrutiny for decades. From theoretical point of view, a series of mechanisms have been proposed for each step of MTG process during these years . Blaszkowski and van Santen considered two different pathways for dimethyl ether formation from surface methoxy intermediate or associative mechanism.…”

Section: Introductionmentioning

confidence: 99%

Effect of ketene additive and Si/Al ratio on the reaction of methanol over HZSM‐5 catalysts

Hassanpour

Zamani

Dabbagh

2017

Applied Organom Chemis

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The influence of ketene as possible intermediate for the reaction of methanol to aromatics was investigated over HZSM‐5 catalysts (Si/Al ratio of 15 and 9) using diketene‐acetone (2,2,6‐trimethyl‐4H‐1,3‐dioxin‐4‐one) as ketene precursor under atmospheric pressure at 300 °C. The physicochemical properties of HZSM‐5 catalysts were investigated by NH3‐TPD, BET, XRD and ICP analysis. The distribution of products was measured by GC‐Mass spectrometer. These catalysts exhibit high reactivity and selectivity for the conversion of methanol and/or ketene to hydrocarbons (mostly high octane number xylenes, trimethylbenzenes, tetramethylbenzenes and ≤1.5% benzene). The conversion of neat diketene‐acetone over these catalysts produced aromatics compounds and significant amounts of oxygenated compounds (ketone, carboxylic acid, phenol, furan, pyran and others) depending on Si:Al ratio. These catalysts with high acid content produced small amount of saturated and unsaturated hydrocarbons without releasing significant amount of gas. The ketene and produced oxygenates from ketene appears to act as intermediates for the formation of aromatic compounds.

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Light olefin transformation over ZSM-5 zeolites with different acid strengths – A kinetic model

Cited by 52 publications

References 43 publications

Reaction pathway and kinetics of C3–C7 olefin transformation over high-silicon HZSM-5 zeolite at 400–490°C

Reaction pathway and kinetics of C3–C7 olefin transformation over high-silicon HZSM-5 zeolite at 400–490°C

Acid–base characterization of heterogeneous catalysts: an up-to-date overview

Effect of ketene additive and Si/Al ratio on the reaction of methanol over HZSM‐5 catalysts

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