On limitations of regenerating an HZSM-5 catalyst for the MTG Process

Aguayo, Andrés T.; Gayubo, Ana G.; Ortega, J.; Moran, Angel L.; Bilbao, Javier

doi:10.1016/s0167-2991(97)80201-7

Cited by 10 publications

(17 citation statements)

References 13 publications

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“…The mean value of E obtained (about 141 kJ/mol) is also in consistent with that value obtained by Zhu and is within the range of Aguayo et al They found combustion activation energy of coke deposited on the SAPO-34 zeolite after aging is between 127 and 151 kJ/mol, which is strongly dependent on the ratio of hydrogen to carbon of coke . However, the activation energy obtained in our study is higher than that reported for the HZSM-5 catalyst. , This phenomenon was also reported by Aguayo et al This might be explained by the fact that for the SAPO-34 zeolite with big cavities, the coke deposited on it is of a higher molecular weight and a lower ratio of hydrogen to carbon than that of the HZSM-5 zeolite . In addition, the activation energy of the aging coked catalyst was also calculated, which can be seen in the Supporting Information.…”

Section: Resultssupporting

confidence: 92%

“…6 However, the activation energy obtained in our study is higher than that reported for the HZSM-5 catalyst. 23,26 This phenomenon was also reported by Aguayo et al This might be explained by the fact that for the SAPO-34 zeolite with big cavities, the coke deposited on it is of a higher molecular weight and a lower ratio of hydrogen to carbon than that of the HZSM-5 zeolite. 6 In addition, the activation energy of the aging coked catalyst was also calculated, which can be seen in the Supporting Information.…”

Section: Kinetic Theorysupporting

confidence: 69%

“…Aguayo et al found that the activation energy was 105 kJ/mol and the coke combustion rate was lower than those in other catalysts when they studied the combustion of the coked HZSM-5 zeolite in methanol to gasoline conversion. 23 To make out the coke combustion behavior was caused by the coke properties or the pore structure of the zeolite, Ortega et al further compared the oxidation of the coke released from the HZSM-5 zeolite with that within the HZSM-5. 24 Results showed the oxidation rate of coke within the zeolite was lower than that released from the zeolite, which means that the combustion of coke is restricted by the porous structure of HZSM-5.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, numerous studies about regeneration kinetics of deactivated HZSM-5 zeolite catalysts have been carried out. Aguayo et al found that the activation energy was 105 kJ/mol and the coke combustion rate was lower than those in other catalysts when they studied the combustion of the coked HZSM-5 zeolite in methanol to gasoline conversion . To make out the coke combustion behavior was caused by the coke properties or the pore structure of the zeolite, Ortega et al further compared the oxidation of the coke released from the HZSM-5 zeolite with that within the HZSM-5 .…”

Section: Introductionmentioning

confidence: 99%

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Kinetic Study on Air Regeneration of Industrial Methanol-to-Olefin Catalyst

Zhao

Zhou

et al. 2020

Ind. Eng. Chem. Res.

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The regeneration kinetics of coke on an industrial methanol-to-olefin (MTO) catalyst was studied via thermogravimetric analysis under the air atmosphere. To minimize the uncertainty of the kinetic parameters, four model-free methods were employed to calculate the regeneration activation energy. It was found that the activation energies obtained by all methods are quite consistent for any given coke conversion. An average activation energy of 141.1 kJ/mol was obtained for combustion of coke on the industrial MTO catalyst. The master-plot method was then employed to decide the regeneration model function. It showed that the combustion process of coke on the industrial MTO catalyst may be depicted using the Fn model. A comparison between the model prediction and additional experimental results demonstrated that the regeneration kinetics model built in this work can work very well under operation conditions of industrial interest and favor the optimization and design of a regenerator in an industrial MTO unit.

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Section: Resultssupporting

confidence: 92%

Section: Kinetic Theorysupporting

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kinetic Study on Air Regeneration of Industrial Methanol-to-Olefin Catalyst

Zhao

Zhou

et al. 2020

Ind. Eng. Chem. Res.

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“…In the MTG process on HZSM-5 zeolites, to obtain an equilibrated coke whose combustion is reproducible, a treatment of sweeping with N 2 stream at 550 °C for 30 min is required. After this treatment, the coke has a H/C ratio close to 1.0 and its combustion occurs following a first-order kinetics, with a frequency factor of 6.63 10 6 atm -1 min -1 and an activation energy of 27.5 kcal mol -1 (Aguayo et al, 1997b).…”

Section: Kinetic Equations For Simulation Of Reaction-regeneration Cy...mentioning

confidence: 99%

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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