title: Sorbents with high efficiency for CO2capture based on amines-supported carbon for biogas upgrading.
abstract: Sorbents for CO2capture have been prepared by wet impregnation of a commercial active carbon (Ketjen-black, Akzo Nobel) with two CO2-philic compounds, polyethylenimine (PEI) and tetraethylenepentamine (TEPA), respectively. The effects of amine amount (from 10 to 70wt.%), CO2concentration in the feed, sorption temperature and gas hourly space velocity on the CO2capture performance have been investigated. The sorption capacity has been evaluated using the breakthrough method, with a fixed bed reactor equipped with on line gas chromatograph. The samples have been characterized by N2adsorption-desorption, scanning electron microscopy and energy dispersive X-ray (SEM/EDX). A promising CO2sorption capacity of 6.90 mmol/gsorbenthas been obtained with 70wt.% of supported TEPA at 70°C under a stream containing 80vol% of CO2. Sorption tests, carried out with simulated biogas compositions (CH4/CO2mixtures), have revealed an appreciable CO2separation selectivity; stable performance was maintained for 20 adsorption-desorption cycles.
authors.affiliation: CNR Institute of Advanced Technology for Energy "Nicola Giordano", Via S. Lucia 5, 98126 Messina, Italy. Electronic address: lidia.pino@itae.cnr.it.
authors.forename: Lidia
authors.initials: L
authors.lastname: Pino
authors.affiliation: CNR Institute of Advanced Technology for Energy "Nicola Giordano", Via S. Lucia 5, 98126 Messina, Italy.
authors.forename: Cristina
authors.initials: C
authors.lastname: Italiano
authors.affiliation: CNR Institute of Advanced Technology for Energy "Nicola Giordano", Via S. Lucia 5, 98126 Messina, Italy.
authors.forename: Antonio
authors.initials: A
authors.lastname: Vita
authors.affiliation: CNR Institute of Advanced Technology for Energy "Nicola Giordano", Via S. Lucia 5, 98126 Messina, Italy.
authors.forename: Concetto
authors.initials: C
authors.lastname: Fabiano
authors.affiliation: CNR Institute of Advanced Technology for Energy "Nicola Giordano", Via S. Lucia 5, 98126 Messina, Italy.
authors.forename: Vincenzo
authors.initials: V
authors.lastname: Recupero
mesh_terms: D000327:Adsorption; D056804:Biofuels; D002245:Carbon Dioxide / Q000737:chemistry*; D005029:Ethylenediamines / Q000737:chemistry; D008855:Microscopy, Electron, Scanning; D008956:Models, Chemical; D011094:Polyethyleneimine / Q000737:chemistry; D013696:Temperature
chemical_list: D056804:Biofuels; D005029:Ethylenediamines; D002245:Carbon Dioxide; D011094:Polyethyleneimine; C034269:tetraethylenepentamine
keywords: Amine efficiency; Biogas; CO(2) capture; PEI-TEPA based sorbents; Separation selectivity