It is necessary to choose an appropriate chemical catalyst for this reaction system.

选择一种合适的化学催化剂很有必要。

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Fuel cells combine hydrogen and air to produce electricity by running them through a chemical catalyst. The only byproducts are heat and water.

燃料电池让氢与空气通过催化合成反应产生电力，唯一的副产物仅是热量和水。

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The compressed syngas then flows over a specially designed catalyst—a solid material that holds the individual reactant molecules and preferentially encourages particular chemical reactions.

这种催化剂是一种固体物质，能够固定单个反应物分子并优先让反应物分子发生化学反应。

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RNA, including some in which it acts as a chemical catalyst a job that had previously been thought to be restricted to protein-based enzymes.

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But it appears to be a catalyst-driven chemical system that releases both heat and gas in sufficient quantities to pump the wings up and down.

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When the agent made contact with a catalyst embedded in the material, a chemical reaction bonded the two faces of the crack together.

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