About: http://webisa.webdatacommons.org/288794084

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	Preferably, the porous refractory inorganic oxide is a halogen-free material, that is, it does not contain any halogens, such as chlorine or fluorine.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com