| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a catalyst that maintains a stable performance with regard to the decomposition of hydrocarbons over a long time without a carrier. <P>SOLUTION: A catalytic metal precursor is heated in the temperature range of 200 to 1,000°C to be activated under a non-oxidizing atmosphere and preferably, under an inert gas or hydrocarbon gas to obtain a catalyst. The catalyst is not supported by a carrier and carbon particles are interposed between catalytic metal particles. The hydrocarbon is allowed to contact the catalyst obtained by the activation at 200 to 1,000°C to perform direct decomposition on the hydrocarbon. Carbons are produced between the catalytic metal particles to prevent the flocculation of the catalytic metal particles and this allows a catalyst performance to be maintained for a long time, thereby enabling the system to obtain a high purity-carbon containing no catalyst carrier. The catalyst can be obtained without any carrier, thereby enabling the system to manufacture the catalyst at a low cost. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
