Simulation of methane steam reforming enhanced by in situ CO2 sorption utilizing K2CO3 promoted hydrotalcites for H 2 production

Conference proceedings article

Authors/Editors

NAVADOL LAOSIRIPOJANA

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Publication Details

Author list: Chanburanasiri N., Ribeiro A.M., Rodrigues A.E., Laosiripojana N., Assabumrungrat S.

Publisher: Hindawi

Publication year: 2012

ISBN: 9780816910731

eISSN: 1745-4557

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84871770827&partnerID=40&md5=e3dd85951d81f075744a5562fdab407a

Languages: English-Great Britain (EN-GB)

Abstract

The hydrogen production performance of sorption enhanced methane steam reforming (SEMSR) was investigated in this study. Three different K 2CO3 promoted hydrotalcites (HTC) including HTC A: industrial K2CO3 promoted HTC reported in the work of Ding and Alpay (1), HTC B: commercial HTC from SASOL impregnated with K 2CO3 in the work of Oliveira et al. (2), and HTC C: commercial K2CO3 promoted HTC from SASOL, were considered. A set of experiments was carried out to measure of CO2 adsorption on HTC C and a 1-D heterogeneous dynamic fixed bed reactor mathematical model was developed to simulate the performance of SEMSR. It was observed that the CO 2 adsorption characteristics were different among the HTCs, resulting in different sorption enhanced characteristic curves. The reaction period that can be operated to produce the high purity hydrogen (>98%) depends on the sorbent type and operating condition. The system utilizing HTC B offers the best performance with the pre-breakthrough period of 116.67 min at the operating condition: FCH4 = 0.1656mmol/min, T = 773 K, P = 0.2 MPa, S/C = 11.5 and catalyst/total solid = 0.05 while the system with HTC A offers 33.33 min that is better than 8.33 min of HTC C. For HTC B, the increase of steam to methane (S/C) ratio leads to the increase of the pre-breakthrough period. The increase of pressure results in the increase of the time before breakthrough when the S/C value is higher than 11.5 at 773 K and 6.143 at 863 K. The temperature of 863 K is suitable for the operation at a low S/C value while the temperature of 773 K is appropriate for higher S/C values.

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