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Open AccessArticle

Development of Two Novel Processes for Hydrogenation of CO2 to Methanol over Cu/ZnO/Al2O3 Catalyst to Improve the Performance of Conventional Dual Type Methanol Synthesis Reactor

Chemical Engineering Department, Petroleum and Chemical Engineering School, University of Shiraz, Shiraz 71345, Iran
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Catalysts 2018, 8(7), 255; https://doi.org/10.3390/catal8070255
Received: 16 May 2018 / Revised: 13 June 2018 / Accepted: 15 June 2018 / Published: 23 June 2018
(This article belongs to the Special Issue Conversion of CO2 into CO Using Heterogeneous Catalysis)
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Abstract

Conventional methanol synthesis process (CR configuration) consists of water-cooled and gas-cooled reactors in which methanol and water are condensed inside the gas-cooled reactor which deactivates the catalyst. In this study, two novel configurations (AW and ACW configurations) are represented to address this problem in which the gas-cooled reactor is replaced with adiabatic reactor. Moreover, a condenser is applied between adiabatic and water-cooled reactors in ACW configuration. Results show that temperature increases somewhat along the adiabatic reactor that prevents gas condensate formation. Besides, the adiabatic reactor maximum temperature is less than that of first reactor in CR configuration which prevents copper based catalyst thermal sintering. Moreover, a high cross section-to-length ratio of the adiabatic reactor leads to negligible pressure drop along the reactor and improvement in CO2 conversion to methanol that has positive environmental effects. Also, water mole fraction decreases along the reactors of AW and ACW configurations to prevent the deactivation of catalyst active sites. Eventually, methanol production rates by AW and ACW configurations are improved around 25.5% and 43.1% in comparison with CR configuration. So, novel AW and ACW configurations provide many benefits including improvement in catalyst activity and durability, CO2 conversion, and the methanol production rate. View Full-Text
Keywords: methanol; gas condensate; catalyst lifetime; adiabatic reactor; gas-cooled reactor methanol; gas condensate; catalyst lifetime; adiabatic reactor; gas-cooled reactor
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Rahmatmand, B.; Rahimpour, M.R.; Keshavarz, P. Development of Two Novel Processes for Hydrogenation of CO2 to Methanol over Cu/ZnO/Al2O3 Catalyst to Improve the Performance of Conventional Dual Type Methanol Synthesis Reactor. Catalysts 2018, 8, 255.

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