运用微量吸附量热与红外光谱联用技术研究了 BaO 在不同担载量和焙烧温度时对γ-Al2O3表面积热稳定性和表面酸碱性的影响。结果表明γ-Al2O3经1000℃高温焙烧大量的转化为θ-Al2O3和α-Al2O3,BaO/γ-Al2O3经高温焙烧后的表面积与γ-Al2O3的表面积接近,在表面生成 BaO·Al2O3等物相。600℃焙烧后,BaO/γ-Al2O3的表面酸性比γ-Al2O3的稍有下降,而碱性却大为增强。经1000℃焙烧后,表面的酸碱性则均大为降低,但仍有少量较弱的酸碱性。
The γ Al2O3 supported CuO samples were studied. XRD results showed that the loading and calcination temperature affected the surface structure. For example, CuO crystallite appeared at the CuO loading of 7% (about 0.82mmol/100m2) on the support. Both CuO crystallite and CuAl2O4 spinel were present when the CuO/γ Al2O3 sample was calcined at the same temperature (400℃ ). Microcalorimetric adsorption of CO2 and NH3 revealed that the strength of both the acidity and basicity decreased with the increase of CuO loading for the CuO/γ Al2O3 sample. The increase of calcination temperature further decreased the basicity while the acidity was not affected.
