A new method for making low-cost CO.sub.2 sorbents that can be used in large-scale gas-solid processes. The new method entails treating a solid substrate with acid or base and simultaneous or subsequent treatment with a substituted amine salt. The method eliminates the need for organic solvents and polymeric materials for the preparation of CO.sub.2 capture systems.
CONTRACTUAL ORIGIN OF INVENTION
The United States Government has rights in this invention through an employer-employee relationship between the U.S. Department of Energy and The National Energy Technology Laboratory.