Co-Ni/Al2O3catalyst was prepared by the fusion method and used in Fischer-Tropsch synthesis(FTS).The catalysts were characterized by means of nitrogen sorption and scanning electron microscopy.The effect of some react...Co-Ni/Al2O3catalyst was prepared by the fusion method and used in Fischer-Tropsch synthesis(FTS).The catalysts were characterized by means of nitrogen sorption and scanning electron microscopy.The effect of some reaction conditions such as temperature,pressure and H2/CO feed ratio on the catalytic performance of Co-Ni/Al2O3in CO hydrogenation was investigated in a fixed-bed reactor.The results indicate that the optimum reaction conditions are 250℃,0.3 MPa,H2/CO feed ratio of 2.0,and GHSV of 3 000 h-1.Kinetically,the reaction rate was correlated with the Langmuir-Hinshelwood-Hougen-Watson type models.The activation energy for the best fitted model is 88.41 kJ/mol,suggesting that the intra-particle mass transport is not significant.展开更多
以4,4'-二叠氮二苯甲烷(DAM)分别与DIAH,BPDIA,DIAO,BADIA不同酰亚胺炔在本体热聚合条件下制备了不同结构的聚三唑,利用红外和差示扫描量热法研究了其聚合反应工艺及其动力学之间的差异,通过外推法求出特征温度,用Kissinger和Ozawa...以4,4'-二叠氮二苯甲烷(DAM)分别与DIAH,BPDIA,DIAO,BADIA不同酰亚胺炔在本体热聚合条件下制备了不同结构的聚三唑,利用红外和差示扫描量热法研究了其聚合反应工艺及其动力学之间的差异,通过外推法求出特征温度,用Kissinger和Ozawa法计算出相关动力学参数,并研究了催化剂对聚合反应动力学的影响。结果表明,聚合体系中含有柔性结构或者引入侧基结构会降低反应起始温度、反应峰值温度和反应所需的活化能,4种体系的反应级数均为0.95,可认为叠氮与炔基的反应是一级反应,向体系中加入催化剂可以有效地降低反应所需的活化能,不同催化剂的催化效果有着明显差异,使用Cu(PPh3)3Br作为催化剂时,体系的反应活化能为138.92 k J/mol,催化效果最好。展开更多
文摘Co-Ni/Al2O3catalyst was prepared by the fusion method and used in Fischer-Tropsch synthesis(FTS).The catalysts were characterized by means of nitrogen sorption and scanning electron microscopy.The effect of some reaction conditions such as temperature,pressure and H2/CO feed ratio on the catalytic performance of Co-Ni/Al2O3in CO hydrogenation was investigated in a fixed-bed reactor.The results indicate that the optimum reaction conditions are 250℃,0.3 MPa,H2/CO feed ratio of 2.0,and GHSV of 3 000 h-1.Kinetically,the reaction rate was correlated with the Langmuir-Hinshelwood-Hougen-Watson type models.The activation energy for the best fitted model is 88.41 kJ/mol,suggesting that the intra-particle mass transport is not significant.
文摘以4,4'-二叠氮二苯甲烷(DAM)分别与DIAH,BPDIA,DIAO,BADIA不同酰亚胺炔在本体热聚合条件下制备了不同结构的聚三唑,利用红外和差示扫描量热法研究了其聚合反应工艺及其动力学之间的差异,通过外推法求出特征温度,用Kissinger和Ozawa法计算出相关动力学参数,并研究了催化剂对聚合反应动力学的影响。结果表明,聚合体系中含有柔性结构或者引入侧基结构会降低反应起始温度、反应峰值温度和反应所需的活化能,4种体系的反应级数均为0.95,可认为叠氮与炔基的反应是一级反应,向体系中加入催化剂可以有效地降低反应所需的活化能,不同催化剂的催化效果有着明显差异,使用Cu(PPh3)3Br作为催化剂时,体系的反应活化能为138.92 k J/mol,催化效果最好。
