| Summary: | 碩士 === 輔仁大學 === 化學系 === 95 === Chemical hydrogen-storage material（ammonia borane，NH3BH3）,which is a white crystalline solid at ambient temperature and atmospheric pressure and with a the melting temperature of 112-l14°C. When heating NH3BH3 , H2 gas liberates in a sequence of reactions between 137 and 400 ◦C, the quantity of H2 evolved can reach 20 wt.% of its initial mass.
This study start with the synthesis of NH3BH3 . Different methods has been tried to enhance the yield of NH3BH3 . The structure and functional group are determined by 1H-NMR and IR Spectrometer and Gas Chromatography. The thermal decomposition of NH3BH3 was studied by thermogravimetry analysis (TGA), differential scanning calorimetry (DSC). The pyrolysis of ammonia borane are studied by either in the non-isothermal or isothermal modes, and different catalysts are used .
Two catalytic systems are employed, which includes a mesoporous material , SBA-15 and a sulfonic-functionalized SBA-15 material（SBA-15-pr-SO3H）.In the former case, NH3BH3 is infused into SBA-15, and DSC is used to monitoring the decomposition reaction of NH3BH3. In the latter, catalyst SBA-15-pr-SO3H is added to NH3BH3 aqueous solution, and the H2 evolved is analyzed by GC. Besides, SBA-15-pr-SO3H with different molar ratios sulfonic acid are synthesis, and their catalytic capabilities are investigated.
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