干气制乙苯结炭沸石催化剂烧炭再生研究

以苯和炼厂干气中的乙烯合成乙苯结炭催化剂为研究对象，对结炭催化剂上积炭的性质及不同温度下的烧炭情况进行了研究，考察了再生前后催化剂的酸性、活性、晶相、比表面及孔结构等性能的变化。结果表明，催化剂孔的内表面积炭占据了酸性中心，致使催化剂活性降低；在烧炭时温度大于300 ℃才开始烧炭，最佳烧炭温度应控制在500℃～550℃，600 ℃可将炭完全烧净。程序升温脱附（TPD）实验表明，550 ℃实验室烧炭后催化剂酸种类及其比例可完全恢复，酸量可恢复到95%。晶相、孔结构基本未变，催化剂的活性得到良好恢复。

Study on coke-burning regeneration of coked zeolite catalyst used in synthesis of ethylbenzene with dry gas of FCC

The coked zeolite catalyst FX-02 used in synthesis of ethylbenzene with dry gas of FCC (Fluid Catalytic Cracking) was studied by TPO（Temperature　Programmed Oxidation） experiment, by which the coked catalyst was regenerated. The acid properties of the regenerated catalyst were investigated by NH3-TPD(Temperature Programmed Desorption) and compared with the fresh catalyst. Pore structures, activity, crystal phase and specific area were also studied. The components of the coke on the catalyst were analyzed by GC/MS(Gas Chromatography/Mass Spectrometry). The experimental results illustrated that the coke deposited on the active site center of the catalyst led to the catalyst deactivation and could be burned out when the temperature was over 300 ℃. The coke was most compatibly burned at 500 ℃～550 ℃ and burned off completely at 600 ℃. It was also shown that the acid sorts and proportion can be restored completely through regeneration at 550 ℃. The percentage of restored acid amount exceeded 95% and the crystal and the pore structure were nearly as same as the fresh catalyst. The assessment of intrinsic activity of the regenerated catalyst was satisfied by compared with that of the fresh catalyst.