There are a number of ethylene removal technologies available: – Catalysts. Often based on platinum/alumina, these operate at elevated temperature (> 200ºC) and catalytically oxidise ethylene to carbon dioxide and water. --- Use of photocatalytic oxidation of ethylene using titanium dioxide, which can occur at room temperature -- Stoichiometric oxidising agents. Mostly based on potassium permanganate, which again oxidises ethylene and is itself reduced. Sorbents: Sorption of the ethylene and are often based on high surface area materials, including activated carbon, clays and zeolites.