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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received February 8, 2021
Accepted June 22, 2021

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kinetic modeling of methanol to olefins over phosphorus modified HZSM-5 zeolite catalyst

Hagos Birhane Asfha^{1 2} NaYoung Kang¹ Ashenafi Hailu Berta^{1 2} Hodong Hwang^{1 2} Kiwoong Kim^1† Yong-Ki Park^1†

¹Center for Convergent Chemical Process, Korea Research Institute of Chemical Technology (KRICT), Gajeong-ro 141, Yuseong-gu, Daejeon 34114, Korea ²Advanced Materials and Chemical Engineering, University of Science and Technology (UST), Gajeong-ro 217, Yuseong-gu, Daejeon 34113, Korea

kwkim@krict.re.kr

Korean Journal of Chemical Engineering, October 2021, 38(10), 2047-2056(10), 10.1007/s11814-021-0875-4

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Abstract

A lumped kinetic model has been developed for the methanol to olefins (MTO) reaction over phosphorus modified HZSM-5 catalyst. In consideration of mixed feed cracking, a higher reaction temperature than the conventional MTO reaction was chosen. The reaction temperature considered is in range of 500 to 680 °C. The experimental data for the kinetic model were obtained in an isothermal fixed bed reactor over a wide range of operating temperatures and space time of 0.160 to 0.801 g-cat.h/mole of methanol feed. A reaction mechanism comprising seven lumps was utilized to analyze the kinetic behavior of this catalyst. Based on the mathematical kinetic model for the fixed bed reactor, the kinetic parameters were determined by numerical optimization using a hybrid of genetic algorithm and active set gradient method. The developed kinetic model reasonably predicts the experimental data obtained for the reaction conditions considered. It has been found that increasing space time is favorable to light olefins yield, while a maximum water free basis olefin yield of about 82weight % was obtained at a temperature of 630 °C for a space time of 0.801 g-cat.h/mole of methanol feed.

Keywords

Methanol to Olefin Process Kinetic Modelling ZSM-5 Catalyst Catalytic Reaction Mechanism

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