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Nuclear reaction rate A is a significant factor in processes of nucleosyntheses.A multi-layer directed-weighted nuclear reaction network,in which the reaction rate is taken as the weight,and neutron,proton,4 He and the remainder nuclei as the criteria for different reaction layers,is for the first time built based on all thermonuclear reactions in the JINA REACLIB database.Our results show that with the increase in the stellar temperature T9,the distribution of nuclear reac... 相似文献
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Ce改性的Pt/γ-Al2O3催化剂用于富氢气氛下CO选择氧化 总被引:1,自引:0,他引:1
研究了Ce改性的Pt/γ-Al2O3对于富氢气氛下CO选择氧化反应的催化行为.考察了制备条件(共沉积沉淀法、分步沉积沉淀法以及沉积沉淀温度)对催化活性的影响.结果表明,在80℃时用共沉积沉淀方法制备的催化剂Pt-Ce/γ-Al2O3-CP-80对CO氧化反应表现出良好的活性和选择性,CO转化率在120℃时可以达到85%.利用氢气程序升温还原和原位漫反射红外光谱对不同条件下制备的催化剂进行了表征,分析了Ce的促进作用. 相似文献
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