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Indexed by:期刊论文

Date of Publication:2009-10-15

Journal:SEPARATION AND PURIFICATION TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:69

Issue:3

Page Number:288-293

ISSN No.:1383-5866

Key Words:Carbon dioxide; Nitric oxide; Transition-metal; Adsorption; Oxidation; CO2 purification

Abstract:This study investigates the adsorption performance of a number of absorbents prepared by incipient wetness impregnation of 3.85 wt% Fe, Co, Ni, Mn, Co and Ce oxides on HZSM-5 for the removal of trace NO (150-200 ppm) from a CO2 stream to produce food-grade CO2. The adsorbents were characterized using X-ray diffraction, X-ray fluorescence, and N-2 adsorption with their performances evaluated in a fixed-bed flow system. The investigations revealed NO removal of better than 0.1 ppm from the CO2 stream. The breakthrough capacities of the adsorbents for NO removal in the presence Of O-2 were found to significantly increase. The converse was observed in the case of NO adsorption selectivity. Co/HZSM-5(25) was found to be the best adsorbent under all the conditions tested producing CO2 purities of better than 99.9999%. This is significantly higher than for Fe-Mn mixed oxides, claimed to be the best NO adsorbent reported in the literature for CO2 purification. (C) 2009 Elsevier B.V. All rights reserved.