Method for production of n-propanol and other C3-containing products from syngas using membrane supported bioreactor

A method for producing propanol and/or propionate comprising exposing gaseous substrates selected from the group consisting of carbon monoxide, carbon dioxide and hydrogen or combinations thereof to a symbiotic co-culture comprising a C1-fixing microorganism and a C3-producing microorganism both contained within biopores that open to a gas contact surface located on one side of an asymmetric hydrophilic membrane and circulating a fermentation liquid on a liquid contact surface located on the side of the membrane opposite to the gas contact surface to supply nutrients to the biopores and to recover propanol from the biopores while maintaining the symbiotic co-culture at conditions effective to convert the gaseous substrate into propanol and/or propionate.