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采用迎头程序升温技术(FTPS)和脉冲吸附技术,研究了铂催化剂吸附氢中心的类型。结果表明,FTPS 图谱不仅能表征室温吸附氢的脱附行为,而且可以表征氢在铂催化剂上的活化吸附。氢的 FTPS 和脉冲吸附相结合,可以给出氢在催化剂上不可逆吸附分数 f_i随吸附温度变化的规律。FTPS 图谱指出,除室温吸附氢中心外,铂催化剂还有另外二类活化吸氢中心,其最大吸附速率对应的温度分别为360℃和460℃左右。铂催化剂的三类吸氢中心的数目和相应的不可逆吸附分数受到预处理条件和第二组分 Ga 的显著影响。
The types of hydrogen centers adsorbed by platinum catalysts were studied by using the head-up temperature-rising technique (FTPS) and pulse adsorption technique. The results show that FTPS can not only characterize the desorption behavior of hydrogen adsorbed at room temperature, but also characterize the activation adsorption of hydrogen on platinum catalysts. Hydrogen FTPS and pulse adsorption combined with hydrogen can be given on the catalyst irreversible adsorption fraction f_i with the adsorption temperature changes. In addition to the hydrogen adsorption at room temperature, there are two other types of activated hydrogen absorption centers in the platinum catalyst. The corresponding maximum adsorption rates are about 360 ° C and about 460 ° C, respectively. The number of the three types of hydrogen absorption centers and the corresponding irreversible adsorption fraction of the platinum catalyst are significantly affected by the pretreatment conditions and Ga as the second component.