Reactivation of the HZSM‐5 zeolite‐based catalyst used in the MTG process

Gayubo, Ana G.; Aguayo, Andrés T.; Benito, Pedro L.; Landeta, Alberto; Castilla, Marta; Bilbao, Javier

doi:10.1002/aic.690430618

Cited by 16 publications

(13 citation statements)

References 24 publications

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“…The regeneration of this catalyst was achieved by simply heating the catalyst under oxygen atmosphere. These characteristics make H‐ZSM5 zeolite an interesting catalyst for the wide range of applications in many industrial processes, notably, in MTG processes …”

Section: Introductionmentioning

confidence: 99%

“…These characteristics make H-ZSM5 zeolite an interesting catalyst for the wide range of applications in many industrial processes, notably, in MTG processes. [10] 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.…”

Section: Introductionmentioning

confidence: 99%

“…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%

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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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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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 capacity for transforming methanol into olefins is strongly related to the acid strength of the zeolite, − which can be measured by the TPD of ammonia. − The representation of the acidity for the fresh catalyst and its components is shown in Figure .…”

Section: Resultsmentioning

confidence: 99%

MTO with SAPO-34 in a Fixed-Bed Reactor: Deactivation Profiles

Zapater

Lasobras

Soler

et al. 2021

Ind. Eng. Chem. Res.

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Methanol-to-olefins is a promising process that has attracted the attention of many research groups in the last years. Zeolites are the primary catalyst for this process, and SAPO-34 is one of the most used because of its high selectivity toward C 2 −C 4 olefins. As a drawback, it deactivates quickly and forces the process to work alternately using reaction and regeneration cycles. The mechanism by which SAPO-34 deactivates is still on debate, and further research needs to be done. In this study, the evolution of the deactivation profile for an SAPO-34-based catalyst was studied in a fixed-bed reactor. To achieve that, the catalyst bed was extracted after each experiment and divided in sections of 2 cm. For each section, CO 2 adsorption, thermogravimetric analysis, and ammonia temperature-programmed desorption were performed.

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“…The aim of this paper is the simulation and optimization of the transformation of methanol into hydrocarbons (either light olefins or gasoline) when the operation is carried out under reaction-regeneration cycles. This study allows for proving the validity of the kinetic models already proposed for the MTG process (Benito et al, 1996a), for deactivation (Benito et al, 1996b), and for catalyst reactivation (Gayubo et al, 1997). As temperature is very important in these kinetics, studies of simulation and optimization, as well as the experimental verification of the results, have been carried out in an integral fixed-bed reactor operating in the isothermal regime.…”

Section: Introductionmentioning

confidence: 86%

Simulation and Optimization of Methanol Transformation into Hydrocarbons in an Isothermal Fixed-Bed Reactor under Reaction−Regeneration Cycles

Castilla

Gayubo

Aguayo

et al. 1998

Ind. Eng. Chem. Res.

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Both simulation and optimization of the transformation of methanol into gasoline and light olefins (intermediate lump in the kinetic scheme) carried out in an isothermal fixed-bed reactor under reaction−regeneration cycles have been studied by using the kinetics of the following: main reaction, catalyst deactivation, and catalyst reactivation. The catalyst is based on a HZSM-5 zeolite. Optimization of lumps of light olefins and gasoline has been carried out by calculating the optimum values of the length of time for reaction and combustion steps. The effects of other operating conditions (temperature and space time) on the optima have been studied. Suitability of the simulation routine has been proven by carrying out cyclic experiments of reaction−regeneration under the optimum conditions calculated and by comparing the experimental results with those predicted by simulation.

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Reactivation of the HZSM‐5 zeolite‐based catalyst used in the MTG process

Cited by 16 publications

References 24 publications

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

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

MTO with SAPO-34 in a Fixed-Bed Reactor: Deactivation Profiles

Simulation and Optimization of Methanol Transformation into Hydrocarbons in an Isothermal Fixed-Bed Reactor under Reaction−Regeneration Cycles

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