Methanol mediated direct CO2 hydrogenation to hydrocarbons: Experimental and kinetic modeling study
Artikel i vetenskaplig tidskrift, 2022

Carbon dioxide can be utilized as a feedstock to produce chemicals and renewable fuels sustainably. CO2 hydrogenation to hydrocarbons through a methanol mediated pathway requires a more detailed study, examining interactions between reaction processes leading to different product selectivities. In this particular work, we propose a kinetic model for the direct CO2 hydrogenation to different hydrocarbon products over an In2O3/HZSM-5 bifunctional catalytic bed. The model includes a CO2 hydrogenation to methanol model based on a Langmuir Hinshelwood Hougen Watson (LHHW) reaction mechanism over In2O3 catalyst combined with a lump-type methanol to hydrocarbon (MTH) model over the HZSM-5 zeolite. Interestingly, the combined model could largely predict the suppression of the reverse water gas shift (RWGS) reaction and an increase in the yield of hydrocarbons compared to the formation of methanol in case of the same reaction conditions carried out with only the methanol synthesis catalyst (In2O3). Further, by varying the mass ratio of the individual components of the bifunctional catalytic bed, it was demonstrated that a higher outlet concentration of methanol achieved with a higher mass ratio of the methanol synthesis catalyst caused less suppression of the RWGS reaction and shifted the hydrocarbon product distribution to a slightly larger share of higher hydrocarbons. These changes in product selectivity caused by variation of the catalyst mass ratio were both also successfully reproduced by the model. Therefore, a comparison between the experimental results and the model predictions shows that this model, including equilibrium effects for the reactions, can accurately predict the trends of the experimental findings for direct CO2 hydrogenation to hydrocarbons over the In2O3/HZSM-5 catalyst.

Carbon capture and utilization (CCU)

Bifunctional catalytic bed

Kinetic model

CO hydrogenation to hydrocarbon 2

Författare

Sreetama Ghosh

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparat- och reaktionsteknik

Louise Olsson

Chalmers, Kemi och kemiteknik, Kemiteknik

Derek Creaser

Chalmers, Kemi och kemiteknik, Kemiteknik, Kemisk apparat- och reaktionsteknik

Chemical Engineering Journal

1385-8947 (ISSN)

Vol. 435 135090

Storskalig Bio-elektro-flygbränsleproduktionsintegration vid kraftvärmeverk i Östersund, Sverige

Energimyndigheten (48387-1), 2019-06-01 -- 2020-12-31.

Grönt jetbränsle från en integrerad katalytisk process

Energimyndigheten (47450-1), 2018-11-01 -- 2020-12-31.

Ämneskategorier

Kemiska processer

Annan kemiteknik

Organisk kemi

DOI

10.1016/j.cej.2022.135090

Mer information

Senast uppdaterat

2022-03-07