A1 Journal article (refereed), original research

Methanol synthesis through sorption enhanced carbon dioxide hydrogenation


Open Access hybrid publication

Publication Details
Authors: Maksimov Pavel, Laari Arto, Ruuskanen Vesa, Koiranen Tuomas, Ahola Jero
Publisher: Elsevier
Publication year: 2021
Language: English
Related Journal or Series Information: Chemical Engineering Journal
Journal acronym: Chem Eng J
Volume number: 418
ISSN: 1385-8947
eISSN: 1873-3212
JUFO-Level of this publication: 3
Open Access: Open Access hybrid publication
Location of the parallel saved publication: http://urn.fi/URN:NBN:fi-fe202104079642

Abstract

Synthesis of methanol from carbon dioxide is affected by thermodynamic
limitations and excessive formation of water that might have a
detrimental impact on methanol production rate and catalytic activity.
To overcome these effects, sorption enhanced (SE) carbon dioxide
hydrogenation to methanol with selective in-situ adsorption of water is
investigated both experimentally and via process simulation. A
significant improvement in the process performance due to the
thermodynamic equilibrium shift, achieved as a result of selective water
removal, is reported. Depending on the process conditions, during the
SE phase, outlet methanol concentration is ca. 150–290% of the steady
state values recorded after the adsorbent saturation. For carbon
monoxide this factor is ca. 220–510%. The effect of process parameters
such as reactor pressure, temperature, overall gas flowrate and
catalyst-to-adsorbent ratio is thoroughly addressed. Reactor pressure is
demonstrated to affect methanol production during the SE phase to the
greatest extent. Particularly, increasing reactor pressure above 40 bar
enhances methanol formation during the SE phase at the cost of
decreasing carbon monoxide production, thus improving process
selectivity. Although increasing reactor temperature above 250 °C favors
carbon monoxide formation, it results in suppressed methanol production
and considerable shortening of the SE phase duration. Because of the
RWGS reaction fast kinetics, the variations in gas hourly space velocity
and amount of the adsorbent loaded in the reactor affect production of
methanol more than carbon monoxide. The parameters describing kinetics
of the involved reactions and water adsorption are adjusted based on the
acquired experimental data.


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Last updated on 2021-08-04 at 07:38

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