Thus, this polymer catalyst is especially suited to the hydrogenation of the ethylenic double bonds which are linked to aromatic, cyano, carboxyl and ester groups.

苯基、氰基、酯基、羧基在反应中不受影响。 因此，这一聚合物催化剂特别适用于和芳基、腈基、羧基和酯基相连的双键的氢化。

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In this, the electrolyte is a polymer membrane coated with platinum, a metal that acts as a catalyst for the chemistry involved.

ECONOMIST: The dawn of micropower

Fuel cells come in several varieties, but the heart of the sort developed by Ballard is a polymer membrane coated on either side with platinum electrodes (the platinum also acts as a catalyst).

ECONOMIST: Fuel cells hit the road | The