加氢催化剂失活因素与再生活性研究

摘要

对碳沉积和SiO2沉积两种不同因素失活的加氢处理催化剂及再生后催化剂进行物化性质表征,研究两种不同失活因素下催化剂的性质变化.通过TG-DSC、Raman、N2吸附-脱附、TPR和SEM-EDS等表征发现:积炭失活的催化剂上沉积的S、C均较易分解,再生后的催化剂孔结构性质可恢复至新鲜催化剂的90％;而SiO2沉积失活的催化剂上会出现难分解的大晶粒MoS2和石墨化炭,再生后的催化剂孔结构性质也大大下降.TPR表征结果表明,SiO2沉积失活的催化剂再生后其金属与载体间的相互作用力增大,还原温度提高较多,难于被硫化完全.活性评价试验结果表明,积炭失活的催化剂再生后活性能够基本恢复,而SiO2沉积失活的催化剂再生后其活性较差.%Coke and silicon deposition has a great but different influence on the activity of hydrotreating catalyst and regenerated catalyst.The properties of the catalysts after deactivation and regeneration were characterized by TG-DSC,Raman spectroscopy,N2 adsorption-desorption,TPR and SEM-EDS techniques.It is found that the sulfur and carbon compounds is easy to decompose on the deactivated catalyst caused by carbon deposition,the pore structure can be restored close to 90 ％ of fresh catalyst,while the pore structure of deactivated catalyst caused by deposition of silicon has a great loss,and large particles of MoS2 as well as the graphitized carbon appears.TPR tests show that the interaction between the metal and the carrier increases after silicon deposition,resulting in higher reduction temperature and difficult to be sulfided completely.The results of activity evaluation show that the activity of coke-deactivated catalyst can be recovered Mter regeneration,while the activity of silicon-deactivated catalyst is much poor.