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鉴于Pt/TiO_2等负载型过渡金属催化剂经500℃高温氢处理后有一系列特殊的化学行为和物理性质的变化(称为金属担体强相互作用或SMSI),因此研究负载型催化剂在氢中或其他气氛中的电导性质具有重要意义.用电导法曾检验出在不同温度下氢处理的Pt/TiO_2中有晶间氢和结构氢.本文测定了Pt/ZnO催化剂在室温和高温(≥300℃)下氢处理时的电导.发现在室温下Pt/ZnO暴露于H_2中,电导率瞬间增加6个数量级,经抽空或用N_2置换氢后,电导基本上回到原来值,表明在室温下,氢在Pt/ZnO上可发生氢
In view of the fact that a series of special chemical and physical properties (ie, metal-supported strong interaction or SMSI) of Pt / TiO 2 supported transition metal catalysts after hydrogen treatment at 500 ℃ are high, the effects of supported catalysts in hydrogen or other The conductivity in the atmosphere is of great significance.It has been tested by conductivity method that the intermetallic hydrogen and the structural hydrogen in the Pt / TiO 2 treated by hydrogen at different temperatures have been tested.In this paper, the Pt / ZnO catalysts were tested at room temperature and high temperature (≥300 ℃) It is found that at room temperature Pt / ZnO is exposed to H 2, the conductivity increases 6 orders of magnitude instantaneously. After evacuating or substituting hydrogen with N 2, the conductance basically returns to its original value, indicating that at room temperature, hydrogen Hydrogen can occur on Pt / ZnO