Geothermal heat sources around the world are utilised for green power production but can also deliver commercially attractive carbon dioxide (CO2). However, the valuable gas is typically polluted by sulfur and other VOCs (volatile organic compounds) that prevent its industrial use and can also cause unpleasant odour.
Haldor Topsoe’s new selective oxidation catalyst SMC™ removes sulfur from the off-gas, eliminates smell, and produces commercial grade CO2. The CO2 quality of the end-product is sufficient for greenhouses within piping distance, or can be used as feed for a CO2 liquefaction plant – enabling the production of food-grade CO2 in pressurised tanks.
Icelandic geothermal power company HS Orka hf has signed a contract with Topsoe for a demonstration plant that transforms excess CO2 into a commercial product. The plant is the first to use the SMC™ catalyst to remove sulfur compounds from CO2, which is an attractive commercial opportunity for many geothermal and other gas plants around the world.
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