An experiment of hydrogen preparation from steam-carbon reaction catalyzed by K2CO3 was carried out at 700�°C, which was\r\ndriven by the solar reaction system simulated with Xenon lamp. It can be found that the rate of reaction with catalyst is 10 times\r\nmore than that without catalyst. However, for the catalytic reaction, there is no obvious change for the rate of hydrogen generation\r\nwith catalyst content range from10% to 20%. Besides, the conversion efficiency of solar energy to chemical energy ismore than 13.1%\r\nover that by photovoltaic-electrolysis route. An analysis to the mechanism of catalytic steam-carbon reaction with K2CO3 is given,\r\nand an explanation to the nonbalanced [H2]/[CO 2CO2] is presented, which is a phenomenon usually observed in experiment.
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