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The method substitutes a solid-acid catalyst for a liquid one. The solid-acid is a component of manmade pellets called zeolite catalysts. Using this substance reduces the chance of the environment being harmed by a concentrated acid. While the catalyst works well, over time its surface gums up with unwanted byproducts. A supercritical fluid can restore the catalyst activity, but more research is necessary before the method is put into action. |