Simulation of methane steam reforming enhanced by in situ CO2 Sorption Using K2CO3-promoted hydrotalcites for H 2 production

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NAVADOL LAOSIRIPOJANA

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Publication Details

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

Publisher: American Chemical Society

Publication year: 2013

Volume number: 27

Issue number: 8

Start page: 4457

End page: 4470

Number of pages: 14

ISSN: 0887-0624

eISSN: 1520-5029

URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84881267648&doi=10.1021%2fef302043e&partnerID=40&md5=1189cb6da513838adb59d7cd4ededf42

Languages: English-Great Britain (EN-GB)

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Abstract

The hydrogen production performance of sorption-enhanced methane steam reforming (SESMR) was investigated in this study. Three different K 2CO3-promoted hydrotalcites (HTCs), including HTC A, industrial K2CO3-promoted HTC reported in the work by Ding and Alpay (Ding, Y.; Alpay, E. Chem. Eng. Sci. 2000, 55, 3461-3474); HTC B, commercial HTC from SASOL impregnated with K2CO3 in the work by Oliveira et al. (Oliveira, E. L. G.; Grande, C. A.; Rodrigues, A. E. Sep. Purif. Technol. 2008, 62, 137-147); and HTC C, commercial K 2CO3-promoted HTC from SASOL, were considered. A set of experiments was carried out to measure CO2 adsorption on HTC C, and a one-dimensional (1D) heterogeneous dynamic fixed-bed reactor mathematical model was developed to simulate the performance of SEMSR. It was observed that the CO2 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 (99.99%) depends upon the sorbent type and operating conditions. The increase of the steam/methane ratio leads to the increase of the pre-breakthrough period. The increase of the operating pressure results in the increase of the pre-breakthrough period when the S/C value is high enough. The temperature of 863 K is suitable for the operation at a low S/C value, while the temperature of 773 and 740 K is appropriate for higher S/C values. The system using HTC B offers the best performance with the pre-breakthrough period of 720 min at the following operating conditions: Ftot, 0.73 mmol/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 126.67 min, which is better than 20 min of HTC C. ฉ 2013 American Chemical Society.

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