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OALib Journal期刊
ISSN: 2333-9721
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超声改性的cuo/al2o3-mgo催化剂结构及其超低浓度甲烷催化燃烧性能
, PP. 122-128
Keywords: 超声波,改性,cuo/al2o3-mgo,超低浓度甲烷,催化燃烧
Abstract:
？采用普通浸渍和超声改性的方法分别制备了cuo/al2o3-mgo催化剂,用于超低浓度甲烷的催化燃烧,并利用sem、xrd、xps、h2-tpr等技术对催化剂进行表征,研究了超声改性作用对催化剂的结构和性能的影响.结果表明,与普通浸渍法制备的催化剂相比,在超声改性的cuo/al2o3-mgo催化剂上,甲烷的转化率得到提高,燃烧特征温度降低.随着超声时间的延长和超声功率的增加,催化剂的催化活性均呈现先增大后减小的趋势;催化剂制备的最佳超声工况为功率150w、时间20min.超声改性可使催化剂的比表面积和孔容积增大,表面催化活性较高的cu+浓度增加,活性组分cuo由晶相向非晶相转变、分散度增大,晶粒粒径变小、分布更均匀;这使得甲烷催化燃烧的表观活化能下降、催化剂活性得到增强.
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