Title

Analyses of one-step liquid hydrogen production from methane and landfill gas

Authors

Authors

C. P. Huang;A. T-Raissi

Comments

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Abbreviated Journal Title

J. Power Sources

Keywords

liquid hydrogen; cryogenic separation; chemical simulation; steam; methane reforming; water gas shift reaction; Electrochemistry; Energy & Fuels

Abstract

Conventional liquid hydrogen (LH2) production consists of two basic steps: (1) gaseous hydrogen (GH(2)) production via steam methane reformation followed by purification by means of pressure swing adsorption (PSA), and (2) GH2 liquefaction. LH2 produced by the conventional processes is not carbon neutral because of the carbon dioxide (COD emission from PSA operation. A novel concept is herein presented and flowsheeted for LH2 production with zero carbon emission using methane (CH4) or landfill gas as feedstock. A cryogenic process is used for both H-2 separation/purification and liquefaction. This one-step process can substantially increase the efficiency and reduce costs because no PSA step is required. Furthermore, the integrated process results in no CO2 emissions and minimal H2 losses. Of the five flowsheets presented, one that combines low and high temperature CO/CH4 reforming reactions in a single reactor shows the highest overall efficiency with the first and second law efficiencies of 85% and 56%, respectively. The latter figure assumes 10% overall energy loss and 30% efficiency for the cryogenic process. (C) 2067 Elsevier B.V. All rights reserved.

Journal Title

Journal of Power Sources

Volume

173

Issue/Number

2

Publication Date

1-1-2007

Document Type

Article

Language

English

First Page

950

Last Page

958

WOS Identifier

WOS:000250932300043

ISSN

0378-7753

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