CuO/Al2O3催化剂高温固相反应的原位XRD和Raman研究

采用原位XRD和激光Raman光谱等技术对CuO/Al2O3系列催化剂高温下的表面组成和体相结构的变化进行研究.结果表明,随着焙烧温度升高,CuO首先与载体Al2O3发生固相反应生成CuAl2O4.CuAl2O4层能阻止外层CuO进一步向载体Al2O3扩散,从而使部分CuO稳定在CuO/Al2O3催化剂的表层.

In-situ XRD and Raman Spectroscopic Study on the Solid State Reaction of CuO/Al2O3 Catalysts at High Temperature

A series of CuO/Al2O3 catalysts were prepared by impregnation method with different loadings, and calcined temperatures. The phase evolution of the surface region and the bulk on the CuO/Al2O3 catalysts was characterized by high-temperature in-situ XRD and Raman techniques. The experimental results show that CuAl2O4 phase formed as a result of a solid-solid interaction between CuO and Al2O3 when the calcination temperature reaches to 800 ℃,and the amount of CuAl2O4 increases at high temperature, which brings on the CuO in the surface region becomes more difficult to extend into the bulk, then the CuO can be stabilized on the surface region even after calcination at 900 ℃.