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采用XRD,TEM及脉冲化学吸附等方法,研究了γ-Al_2O_3表面上Cr_2O_3晶粒大小和聚集状态及助剂CeO_2对Cr_2O_3/Al_2O_3催化剂活性、选择性及抗炭性能的影响。当Cr_2O_3含量增高时,Cr_2O_3晶粒逐渐增大,有三种不同聚集态分布在γ-Al_2O_3的表面上,其中晶粒较大、聚集为片状的 Cr_2O_3对临氢脱烷基制苯反应最为有利,Cr_2O_3适宜晶粒与 PyrotolCr_2O_3/Al_2O_3催化剂相近,助剂CeO_2可提高Cr_2O_3/Al_2O_3催化剂的抗炭性能,引入量不宜过多,否则将导致催化剂活性下降。
The effects of grain size and agglomeration of Cr_2O_3 on the surface of γ-Al_2O_3 and the activity, selectivity and anti-carbon property of CeO_2 on Cr_2O_3 / Al_2O_3 catalysts were investigated by XRD, TEM and pulsed chemical adsorption. When the content of Cr 2 O 3 increased, the grain size of Cr 2 O 3 gradually increased, and there were three different aggregates distributed on the surface of γ-Al 2 O 3, of which Cr_2O_3 aggregated into flake was most favorable for the reaction of hydrodealkylation to benzene The Cr_2O_3 suitable grains are similar to the PyrotolCr_2O_3 / Al_2O_3 catalyst. CeO_2 can improve the carbon resistance of the Cr_2O_3 / Al_2O_3 catalyst. The amount of Cr_2O_3 / Al_2O_3 catalyst should not be too much. Otherwise, the catalyst activity will decrease.