Efficacy of modified carbon molecular sieve with iron oxides or choline chloride-based deep eutectic solvent for the separation of CO2/CH4

Nur Indah Fajar Mukti; Teguh Ariyanto; Wahyudi Budi Sediawan; Imam Prasetyo

doi:10.1039/d3ra02890a

Efficacy of modified carbon molecular sieve with iron oxides or choline chloride-based deep eutectic solvent for the separation of CO₂/CH₄

RSC Adv. 2023 Aug 1;13(33):23158-23168. doi: 10.1039/d3ra02890a. eCollection 2023 Jul 26.

Authors

Nur Indah Fajar Mukti^{1

2

3}, Teguh Ariyanto^{1

3}, Wahyudi Budi Sediawan¹, Imam Prasetyo^{1

3}

Affiliations

¹ Department of Chemical Engineering, Faculty of Engineering, Universitas Gadjah Mada Yogyakarta 55281 Indonesia imampras@ugm.ac.id.
² Department of Chemical Engineering, Faculty of Industrial Technology, Universitas Islam Indonesia Yogyakarta 55584 Indonesia.
³ Carbon Material Research Group, Department of Chemical Engineering, Universitas Gadjah Mada Yogyakarta 55281 Indonesia.

Abstract

It is necessary to separate CO₂ from biogas to improve its quality for the production of biomethane. Herein, an improvement in the separation of CO₂/CH₄via adsorption was achieved by modifying the surface of CMS. The surface modification of CMS was performed by impregnation with metal oxide (Fe₃O₄) and N-doping (DES-[ChCl:Gly]). Subsequently, the efficacy of the surface-modified CMS was investigated. This involved CMS modification, material characterization, and performance analysis. The uptake of CO₂ by CMS-DES-[ChCl:Gly] and CMS-Fe₃O₄ was comparable; however, their performance for the separation of CO₂/CH₄ was different. Consequently, CMS-DES-[ChCl:Gly] and CMS-Fe₃O₄ exhibited ca. 1.6 times enhanced CO₂ uptake capacity and ca. 1.70 times and 1.55 times enhanced CO₂/CH₄ separation, respectively. Also, both materials exhibited similar repeatability. However, CMS-DES-[ChCl:Gly] was more difficult to regenerate than CMS-Fe₃O₄, which is due to the higher adsorption heat value of the former (59.5 kJ).