Gold nanoparticles (NPs) were deposited to a zeolite-type metal-organic framework (MOF) by a simple solid grinding method. A catalyst, Au@ZIF-8, represents the first example of an active catalyst in CO oxidation by using a MOF as a novel support for noble metal NPs. The catalytic activity for CO oxidation is improved along with increasing Au loadings, and the highest catalytic activity is obtained for 5.0 wt % Au@ZIF-8, which presents half conversion of CO at approximately 170 degrees C. Gold NPs are close to being monodisperse and have no aggregation during catalytic reaction, and the catalytic activity is reproducible.

The oxidation of CO to CO 2 by metal catalysts has been intensively investigated; for example, gold nanoparticles have exhibited excellent properties. 1 The metal catalysts are often dispersed on a solid support, such as oxide, zeolite, and so on. Exposed to heating during vehicle use, these metal particles trend to agglomerate and grow, which causes their overall surface area to decrease. As a result, catalyst activity deteriorates. 2 These metal catalysts are also very easily poisoned by exposing them to moisture or organic compounds. On the other hand, the newly developed microporous metal-organic polymers (MMOPs) have recently

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