Integrated High Temperature Coal-to-Hydrogen System with CO2 Separation [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy, 2007.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators:: General Electric Company, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

A significant barrier to the commercialization of coal-to-hydrogen technologies is high capital cost. The purity requirements for H₂ fuels are generally met by using a series of unit clean-up operations for residual CO removal, sulfur removal, CO₂ removal and final gas polishing to achieve pure H₂. A substantial reduction in cost can be attained by reducing the number of process operations for H₂ cleanup, and process efficiency can be increased by conducting syngas cleanup at higher temperatures. The objective of this program was to develop the scientific basis for a single high-temperature syngas-cleanup module to produce a pure stream of H₂ from a coal-based system. The approach was to evaluate the feasibility of a 'one box' process that combines a shift reactor with a high-temperature CO₂-selective membrane to convert CO to CO₂, remove sulfur compounds, and remove CO₂ in a simple, compact, fully integrated system. A system-level design was produced for a shift reactor that incorporates a high-temperature membrane. The membrane performance targets were determined. System level benefits were evaluated for a coal-to-hydrogen system that would incorporate membranes with properties that would meet the performance targets. The scientific basis for high temperature CO₂-selective membranes was evaluated by developing and validating a model for high temperature surface flow membranes. Synthesis approaches were pursued for producing membranes that integrated control of pore size with materials adsorption properties. Room temperature reverse-selectivity for CO₂ was observed and performance at higher temperatures was evaluated. Implications for future membrane development are discussed.

Report Numbers:

E 1.99:924436

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Note:

Published through SciTech Connect.
05/31/2007.
James A. Ruud; Wei Wei; Anthony Ku; Vidya Ramaswamy; Patrick Willson.

Type of Report and Period Covered Note:

Final;

Funding Information:

FC26-05NT42451

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