摘要
以旋风细粉类流化催化裂化(FCC)废催化剂粉末为原料,研究其压片成型工艺,并采用等体积浸渍法制备了双金属催化剂,考察了其对挥发性有机化合物(VOCs)催化氧化的性能。结果表明:在FCC废催化剂和γ-Al_(2)O_(3)质量比为6:4,黏结剂田菁胶粉的用量为2.0%(质量分数),扩孔剂羟丙基甲基纤维素的用量为4.0%(质量分数),成型压力为8 kN,压片机转速为10 r/min,焙烧温度为550℃,焙烧时间为2 h的条件下,可得到径向抗压碎强度为108.8 N/cm,比表面积为176.5 m^(2)/g,孔径为10.7 nm的片状颗粒载体;当催化剂用量为5 g,反应空速为6000 mL/(g·h),Fe、Mn负载量(质量分数)分别为12%和7%,废气在440℃处理后,反应器出口处的乙苯转化率可达到98.9%,废气中乙苯的浓度可降低到47.8 mg/m3,达到了废气排放标准。上述应用实现了FCC废催化剂的资源化利用,达到了以废治废的目的。
Using fluid catalytic cracking(FCC)spent catalyst powder containing cyclone fine powder as raw material,its tableting process was studied.Bimetallic catalysts were subsequently prepared via the equal volume impregnation method,and their catalytic oxidation performance for volatile organic compounds(VOCs)was investigated.The results showed that under the conditions of a 6:4 mass ratio of FCC spent catalyst toγ-Al_(2)O_(3),a dosage of 2.0%(mass fraction)of binder sesbania gum powder,a dosage of 4.0%(mass fraction)of pore-expanding agent hypromellose(HPMC),a molding pressure of 8 kN,a rotation speed of 10 r/min,a calcination temperature of 550℃,and a calcination time of 2 h,a sheet-like particle carrier with a radial strength of 108.8 N/cm,a specific surface area of 176.5 m^(2)/g,and a pore size of 10.7 nm could be obtained.When the catalyst dosage was 5 g,the reaction space velocity was 6000 mL/(g·h),the iron and manganese loading were 12%and 7.0%respectively,and the exhaust gas was treated at 440℃,the conversion rate of ethylbenzene at the reactor outlet could reach 98.9%,and the concentration of ethylbenzene in the exhaust gas could be reduced to 47.8 mg/m3,which met the exhaust emission standard.The resource utilization of FCC spent catalyst had been realized,and the purpose of waste control with waste had been achieved.
作者
于涛
陈献
崔咪芬
汤吉海
乔旭
YU Tao;CHEN Xian;CUI Mifen;TANG Jihai;QIAO Xu(School of Chemical Engineering,Nanjing University of Technology,Nanjing 211800,China;State Key Laboratory of Material Chemistry Engineering,Nanjing University of Technology,Nanjing 211800,China)
出处
《化学反应工程与工艺》
2025年第4期484-494,共11页
Chemical Reaction Engineering and Technology
