About: http://webisa.webdatacommons.org/400900589

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Impurities, such as H2 S and NH3 are undesirable and, if present in significant amounts, will normally be removed from the treat gas, before it is fed into the reactor.
http://www.w3.org/ns/prov#wasQuotedFrom	google.co.uk