摘要
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。
Hydrogen adsorption on supported and unsupported Pt catalysts were stu-died by Froutal Temperature Programmed Sorption Technique(FTPS)and H_2pulse technique.The spectra of FTPS indicated that in addition to H_2 adsor-ption at room temperature,there are two other sites of activated adsorptionof H_2 on Al_2O_3 supported Pt catalyst,showing that FTPS can be used tocharacterize not only the desorption of adsorbed H_2 at room temperature,butalso the activated adsorption of H_2 with their T_(max) at about 360 and 460℃,respectively.The combined method of pulse and FTPS techniques of H_2 wasused to study the change of reversible and irreversible adsorption of H_2 withtemperature The results showed that the catalyst preparation parameters andthe second component Ga significantly affect the number of the three H_2adsorption sites as well as the amount of both reversible and irreversible H_2adsorption on Pt catalyst.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
1990年第3期25-31,共7页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
国家自然科学基金资助项目
