<http://webisa.webdatacommons.org/prov/226164211>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/417995550> .
<http://webisa.webdatacommons.org/417995550>	<http://www.w3.org/ns/prov#wasQuotedFrom>	<worldwidescience.org> .
<http://webisa.webdatacommons.org/prov/435232871>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://webisa.webdatacommons.org/417995550> .
<http://webisa.webdatacommons.org/417995550>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/ns/prov#Entity> .
<http://webisa.webdatacommons.org/417995550>	<http://www.w3.org/ns/prov#value>	"After removal of the heavy hydrocarbons (i.e. tar) and sulphur components, the producer gas can be converted catalytically to a mixture of mainly methane, carbon dioxide and water." .