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在剖析Cr_2O_3-Al_2O_3系催化剂微观结构的基础上,通过对Cr_2O_3 Al_2O_3的电导测定、热磁分析研究了Cr_20_3-Al_2O_3催化剂的半导性及它对临氢脱烷基催化过程的影响。实验结果表明,氧化态Cr_2O_3为p型半导体,在还原气氛中,将转化为n型。其转变温度随Cr_2O_3含量的增加而提高。催化甲苯临氢脱烷基的活性中心为Cr(Ⅱ)。具有尖晶石结构的γ-Cr_2O_3比α-Cr_2O_3的活性更好。在甲苯气氛中,载流子Cr(Ⅱ)越多,活性越高;在苯气氛中,载流子Cr(Ⅱ)相对越少,其对苯的选择性越好。
Based on the analysis of the microstructure of Cr_2O_3-Al_2O_3 catalyst, the semiconducting properties of Cr_2O_3-Al_2O_3 catalyst and its influence on the catalytic dealkylation of hydrodesulfurization were investigated by conductivity measurement and thermomagnetic analysis of Cr_2O_3 Al_2O_3. The experimental results show that the oxidation state of Cr_2O_3 is a p-type semiconductor, and it is converted to n-type in a reducing atmosphere. The transformation temperature increases with the increase of Cr 2 O 3 content. Catalytic toluene hydrodealkylation of the active center of Cr (Ⅱ). Γ-Cr 2 O 3 with spinel structure is more active than α-Cr 2 O 3. In the toluene atmosphere, the more Cr (Ⅱ) carrier, the higher the activity. In the benzene atmosphere, the fewer the carrier Cr (Ⅱ), the better the selectivity to benzene.