A new preparation method (ME method) using water-in-oil microemulsion was developed or supported metal catalysts. Colloids presynthesized in the microemulsion were immobilized by hydrolysis of metal alkoxide on supports without aggregation of the colloid, resulting in catalysts with narrow distributions of metal particle size. The Rh particle size of Rh/SiO2 catalysts could be controlled independently of Rh loadings by changing the synthesis conditions of the colloid such as the type of microemulsion system and synthesis temperature. Using the particle size-controlled catalysts, the dependence of the catalytic activity on Rh particle size in CO hydrogenation was studied, and the catalyst with the optimum Rh size for CO and CO2 hydrogenation showed extremely high activity. The ME method can also control the surface area of the supports. The ME method also resulted in stronger metal-support interaction of the catalyst, so that Ni/Al2O3 and Fe/SiO2 catalysts prepared by the ME method showed anomalous behavior for catalytic CH4-steam reforming and the CO hydrogenation, respectively.
|Number of pages||13|
|Journal||Sekiyu Gakkaishi (Journal of the Japan Petroleum Institute)|
|Publication status||Published - Jul 2001|
All Science Journal Classification (ASJC) codes
- Fuel Technology
- Energy Engineering and Power Technology