Zeolite minilith: A unique structured catalyst for the methanol to gasoline process

Omojola, Toyin; Cherkasov, Nikolay; Rebrov, Evgeny V.; Lukyanov, Dmitry B.; Perera, Semali

doi:10.1016/j.cep.2018.07.016

Cited by 15 publications

(23 citation statements)

References 58 publications

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“…The initial steps of methanol-to-olefin conversion involves an equilibration process of methanol, DME and water with surface methoxy species and molecularly adsorbed species acting as intermediates. 9,10 Although dimethyl ether can be produced from methanol, 11 at high scale it can also be obtained from different fossil fuels, biomass and carbon dioxide and can be considered independently as an alternative process to the formation of olefins. 12,13 However, higher water content is obtained during MTO conversion in comparison to dimethyl ether to olefins (DTO) conversion leading to faster deactivation by coke in the latter (DTO) under atmospheric conditions.…”

Section: Introductionmentioning

confidence: 99%

Mechanistic insights into the conversion of dimethyl ether over ZSM-5 catalysts: A combined temperature-programmed surface reaction and microkinetic modelling study

Omojola

Veen

2021

Chemical Engineering Science

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Rates of adsorption, desorption, and surface reaction of dimethyl ether (DME) to olefins over fresh and working ZSM-5 catalysts of different Si/Al ratios (36 and 135) have been decoupled using a combination of temperature programmed surface reaction experiments and microkinetic modelling. Transient reactor performance was simulated by solving coupled 1D non-linear partial differential equations accounting for elementary steps occurring during the induction period based on the methoxymethyl mechanism on the zeolite catalyst, and axial dispersion and convection in the reactor. Propylene is the major olefin formed and scaling relations between activation energies of DME desorption and barriers of formation of methoxymethyl and methyl propenyl ether are observed. Six ensembles of sites are observed with a maximum of three adsorption/desorption sites and three adsorption/desorption/reaction sites. Barriers are generally higher over working catalysts than fresh catalysts. Activation energies of propylene formation of ca. 200 kJ mol -1 are obtained corroborating direct mechanistic proposals. File list (2) download file view on ChemRxiv TPSR of DME over ZSM-5 catalysts_ChemRXiv_Prepri... (866.48 KiB) download file view on ChemRxiv SI_TPSR of DME over ZSM-5 catalysts_ChemRXiv_Prepr... (1.06 MiB) Omojola and van Veen

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Section: Introductionmentioning

confidence: 99%

Mechanistic insights into the conversion of dimethyl ether over ZSM-5 catalysts: A combined temperature-programmed surface reaction and microkinetic modelling study

Omojola

Veen

2021

Chemical Engineering Science

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“…Yet the internal diffusion of bulky molecules is hindered in microporous zeolites; therefore, only active sites located in the channels close to the crystal outer surface are accessible for the reactants. For this reason, thin films of nanosized zeolites [19], zeolite membranes [20], structured zeolite catalysts [21], and zeolite on the inner reactor walls [22,23] attracted much attention, due to improved mass and heat transfer rates. Newly developed zeolite catalysts have significantly improved stability and high activity [24].…”

Section: Application Of Structured Catalysts and Reactorsmentioning

confidence: 99%

Design of a Compact Microreactor/Heat-Exchanger for a Distributed Production of Liquid Hydrocarbons from Methanol

Cherkasov

Rebrov

2021

Reactions

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The paper compares conceptual designs of a microstructured reactor/heat-exchanger for the small-scale production of C8+ range hydrocarbons from methanol over H-ZSM-5 catalytic coatings. In these designs, air was used as a cooling fluid in the adjacent cooling channels. The heat transfer characteristics of a single-zone reactor (with channels 500 μm in diameter) and a two-zone reactor (with an additional coolant inlet) have been compared. A single reaction zone was not able to reduce the temperature gradient below 15 K, while a two-zone configuration, with a counter-current fluid flow in the upstream section and co-current flow in the downstream section, demonstrated a near-isothermal behaviour, with a mean temperature of 653 K.

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“…Internal mass transferthe diffusion of the adsorbate molecules into the pores may often be a rate-limiting factor. In this case, the researcher may either look for the intrinsic rates of adsorption that requires studies with smaller adsorbent particles or using wall coatings [14,52,53]. Often, however, it is more practically important to characterise the apparent rates in effect, internal mass transfer because such data characterises the behaviour of the adsorbents in many practical applications.…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Liquid-phase adsorption: Common problems and how we could do better

Cherkasov

2020

Journal of Molecular Liquids

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Adsorption plays a vital role in many applications from adsorbents for concentrating valuable compounds or removing pollutants to catalysts. In gas and liquid phases, the adsorption phenomena may look similar and the results are often transferred. But solvents play a role and may change the adsorption behaviour even for strong adsorbatesliquid phase adsorption is different! The review covers kinetics and thermodynamics of adsorption processes and focuses on several areas that receive only minor attention despite being crucial for obtaining reliable results. Such underappreciated areas include the analysis of how to maximise experimental accuracy of adsorption studies and analyse the model parameters and their confidence intervals; the effect of the mathematical representation and model linearization on the results; the possibility of processes other than adsorption during the experiments.The experiments based on disappearance of the adsorbate from the equilibrium solution shall be performed to ensure at least 10% decrease in concentration for reasonable accuracy. Regression analysis and analysis of the confidence intervals of the parameters merit particular attention as well as an independent validation of the model assumptions.Even an excellent data fit may provide results differing by several times from the correct values.Adding to the dispute on dimensions in the adsorption constants in van't Hoof equation, the review adds arguments in favour of using constants in L/mol units. The review concludes with the proposed workflow in the analysis of liquid-phase adsorption data from the data acquisition to data analysis and modelling and offers a Matlab app for Langmuir adsorption data analysis.

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Zeolite minilith: A unique structured catalyst for the methanol to gasoline process

Abstract: Please refer to published version for the most recent bibliographic citation information. If a published version is known of, the repository item page linked to above, will contain details on accessing it.

Cited by 15 publications

References 58 publications

Mechanistic insights into the conversion of dimethyl ether over ZSM-5 catalysts: A combined temperature-programmed surface reaction and microkinetic modelling study

Mechanistic insights into the conversion of dimethyl ether over ZSM-5 catalysts: A combined temperature-programmed surface reaction and microkinetic modelling study

Design of a Compact Microreactor/Heat-Exchanger for a Distributed Production of Liquid Hydrocarbons from Methanol

Liquid-phase adsorption: Common problems and how we could do better

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