Journal
CHEMICAL ENGINEERING SCIENCE
Volume 66, Issue 3, Pages 342-354Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2010.10.030
Keywords
Sorption enhanced reaction process; Mathematical modelling; Steam methane reforming; Catalysis; Hydrogen; Carbon dioxide
Categories
Funding
- FCT [SFRH/BD/17132/2004]
- LSRE [FEDER/POCI/2010]
- Fundação para a Ciência e a Tecnologia [SFRH/BD/17132/2004] Funding Source: FCT
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In this work, we have evaluated the performance of an SMR-SERP unit (steam methane reforming sorption enhanced reaction process), using two different Ni/Al2O3 catalysts: commercial Octolyst 2001'' from Degussa and a large-pore catalyst (Catalyst A). The selective CO2 sorbent was a potassium modified hydrotalcites. Several experiments were performed under different operating conditions to validate a mathematical model. Experimental results show that the Degussa catalyst is more active and more selective to CO2 producing hydrogen with higher purity and less CO than the large-pore catalyst. Cyclic SMR-SERP experiments were also performed. The cycles comprise four different steps: reaction, depressurization, reactive regeneration and pressurization. In the cyclic experiments, conversion was 43% higher than in an SMR reactor, while H-2 purity was 75%, which is 25% higher than in normal SMR operation. Results indicate that more active catalysts also promote a better reactive regeneration optimizing the use of part of the product (H-2). The proposed mathematical model was validated in a wide range of operating conditions and in a cyclic experiment. The model was able to describe the SMR-SERP experiments without any fitting parameters. (C) 2010 Elsevier Ltd. All rights reserved.
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