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本文以甲基环成烷和正己烷在氢流中的转化反应为探针,研究铂催化剂的金属功能和酸功能在烷烃反应中所起的作用及其与反应温度的关系。结果表明,催化剂双功能性质的体现依赖于反应温度。当反应温度低于450℃时,酸性中心的作用很弱,金属与载体间的相互作用直接影响金属的性质,从而成为决定催化剂反应性能的主要因素;当反应温度高于450℃时,由于铂表面的积碳而失去一定的金属活性,而载体的酸功能活性却大大增加,于是金属与载体间相互作用成为催化反应的主要因素,正己烷反应才遵循典型的双功能机理。
In this paper, the conversion reaction of methylcyclohexane and n-hexane in hydrogen stream was used as a probe to investigate the metal function and acid function of platinum catalyst in alkane reaction and its relationship with reaction temperature. The results show that the bifunctional nature of the catalyst depends on the reaction temperature. When the reaction temperature is lower than 450 ℃, the role of acid center is very weak. The interaction between metal and support directly affects the properties of the metal and thus becomes the main factor that determines the catalytic performance of the catalyst. When the reaction temperature is higher than 450 ℃, Surface carbon deposition and loss of a certain amount of metal activity, while the carrier acid activity greatly increased, so the metal and the interaction between the carrier has become the main catalyst for the reaction, n-hexane reaction to follow the typical bifunctional mechanism.