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Enhancements of monoethanolamine CO₂ absorption rate and degradation in the presence of nickel nanoparticles catalysts

Lookup NU author(s): Harry Orendi, Professor Lidija SillerORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

In the study of the catalytic effect of nickel nanoparticles (NiNPs) on amine-based CO₂ capture systems, Monoethanolamine (MEA) was subjected to a CO₂ loading at greatly varying concentrations (3-30 wt%) at two temperatures (20 °C and 50 °C) for the first time in a lab study to the best of our knowledge. This study shows that NiNPs can enhance the rate of CO₂ absorption into MEA and that its enhancement is greater at 20 °C than at 50 °C. Solutions were loaded with CO₂ until full saturation and the mass gain was recorded. At 20 °C the overall enhancement ranged between 4.0-7.4% with the optimum (>7.0%) observed at concentrations of 5 wt% and 20 wt% of MEA with NiNPs. In addition, there were large reductions in the time that it takes to fully saturate the MEA with CO₂, (up to a 42% reduction) and there were differences in peak loading (mol_CO2/mol_mea) between the NiNPs solution and the control (without NiNPs) (of up to 12.5% for the same time at 20 °C and 30 wt% of MEA with NiNPs). For the first time to the best of our knowledge, the degradation of MEA with and without NiNPs was studied; an oxidative degradation experiment (30 wt %, 0.4 mol_CO2/mol_mea, 7.5 mL/min CO₂, 0.35 L/min air, 55°C) based on typical absorber conditions and a thermal degradation experiment based on typical stripper conditions (30 wt%, 0.5 mol_CO2/mol_mea, 135 °C) were carried out. Gas chromatography-mass spectrometry was used to identify and quantify the major degradation compounds. It is found that NiNPs increase the rate of both oxidative and thermal degradation.

Publication metadata

Author(s): Orendi HW, Joby K, Šiller L

Publication type: Article

Publication status: Published

Journal: Journal of CO2 utilization

Year: 2023

Volume: 79

Print publication date: 01/01/2024

Online publication date: 30/12/2023

Acceptance date: 18/12/2023

Date deposited: 18/12/2023

ISSN (print): 2212-9820

ISSN (electronic): 2212-9839

Publisher: Elsevier

URL: https://doi.org/10.1016/j.jcou.2023.102654

DOI: 10.1016/j.jcou.2023.102654

ePrints DOI: 10.57711/mr6x-9g29

Data Access Statement: Data will be made available on request.

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