prov:value
| - Unsaturated hydrocarbons, such as ethylene, propylene and the like, may be readily converted into valuable liquid hydrocarbons, such as benzone and benzine, without any injurious deposition of carbon by employing as catalysts heavy metals of group 1 of the periodic system, namely gold, silver or copper or alloys of gold, silver or copper, as for example brass, (bronze, manganesecopper or alloys of
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