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OALib Journal期刊
ISSN: 2333-9721
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含尘焦油在改性白云石催化剂上的裂解特性
, PP. 932-939
Keywords: 含尘焦油,白云石催化剂,裂解,再生,粉尘
Abstract:
？采用混捏法制备了一种添加助剂la的ni-白云石催化剂。在常压固定床反应器中,以正十二烷、环己烷、甲苯和甲基萘的混合物作为焦油模型化合物,进行焦油裂解特性研究。考察了温度、空速、水料比等条件对气相产物产率的影响,对该催化剂进行了稳定性和再生性评价,在此基础上探讨了粉尘在催化剂表面沉积对催化剂性能影响的作用及机理。结果表明,该催化剂的最佳操作条件为反应温度800℃、空速300h-1、水料比5:1、再生温度700℃、再生时间1h。xrd表征结果表明,改性白云石催化剂中形成了mgo-nio固溶体和la(nio3)晶相。粉尘中的不同组分对催化剂性能的影响不同,cao有利于提高催化剂的活性,fe2o3的沉积会形成nife2o4的新晶相,而sio2会促进表面积炭,对催化活性的"抑制"作用明显。
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