A New Method for Synthesizing Co-precipitated Cu–ZnO Catalyst and Its Activity for Methanol Decomposition at High Temperature

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  • 銅-亜鉛系共沈触媒の新規合成法およびその高温メタノール分解活性

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<p>Cu–ZnO–Al2O3 catalyst was prepared by introducing fine bubbles of ammonia into a mixed aqueous solution of metal nitrates under carbon dioxide flow and its activity was tested for the methanol decomposition reaction. Specific surface area of the newly developed fine bubble catalyst (FBC) was 94 m2/g and 1.5 times larger than that of conventional catalyst (CVC) prepared by co-precipitation of mixed metallic aqueous solution and sodium carbonate. SEM revealed that the FBC particles were spherical of around 3 μm diameter and homogeneous. The particles of CVC were irregular in size and shape. SEM-EDX showed aggregation of copper in the CVC but good dispersion of all elements in the FBC. FBC had higher activity and less deactivation in the methanol decomposition reaction compared with CVC even at 623-673 K although the reaction time was only 10 hours.</p>

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