Dear Tom Reed, Optimum syngas composition for catalysis is 1.5:1 H2 to CO, but this will vary with catalysis system. I am glad someone clarified the definitions. Sincerely, Leland T. Taylor President Thermogenics Inc. 7100-2nd St. NW, Albuquerque, New Mexico 87107 phone 505-344-4846 fax 505-344-6090 Attached files are zipped and can be decompressed with <A HREF="http://www.aladdinsys.com/expander/">www.aladdinsys.com/expander/ </A> Gasification List is sponsored by USDOE BioPower Program http://www.eren.doe.gov/biopower/ and PRM Energy Systems http://www.prmenergy.com - Other Sponsors, Archives and Information http://www.nrel.gov/bioam/ http://www.crest.org/renewables/gasification-list-archive http://solstice.crest.org/renewables/biomass-info/gasref.shtml http://www.crest.org/renewables/biomass-info/ http://www.crest.org/renewables/biomass-info/carbon.shtml