We found that the amount of methane hydrates formed during synthesis can substantially increase, if trace alcohol vapor (methanol, ethanol or 1-propanol) is added to the Ice-Seed system during the "pressurization" stage. Among them, ethanol has the best promoting effect when the initial system temperature is around 270K. Nearly 91% of the ice seeds can be converted during this stage. Furthermore, the duration of the "heating" stage can be shortened while consuming the remaining ice. Ethanol also has similar catalytic effect for synthesizing carbon dioxide hydrate. This discovery may have practical value for the transportation and storage of natural gas.

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