A dynamic method for investigating the molding process and the mechanical strength of solid catalyst was presented.By means of two sets of equipment(catalyst molding process analyzer CMPA and catalyst mechanical prope...A dynamic method for investigating the molding process and the mechanical strength of solid catalyst was presented.By means of two sets of equipment(catalyst molding process analyzer CMPA and catalyst mechanical properties tester CMPT) designed and fabricated by the authors in laboratory, the dynamic study for Fe-Cr WGSR catalyst pellets was carried out based on the orthogonal experimental design,the effects of some factors in the molding process of Fe-Cr WGSR solid catalyst on the mechanical strength of catalyst pellets were systematically examined,and the molding conditions were optimized. The results showed that there existed the relationship between catalyst pellet density and compact pressure,and the concept of macroscopic elastic modulus was introduced.Furthermore,the remarkable factors (such as predensification process and calcination temperature) affectng Y 0 factors,macroscopic elastic modulus E ′,rate of densification and side crushing strength were also investigated.展开更多
通过无定型磷酸铝在大约800℃的高温下同氨反应,制备了新型催化材料氮化磷酸铝.考察了磷酸铝粒度、氨流量和氮化温度对制备的影响.实验发现材料粒径对氮化有一定的影响,粒径小于0.25 mm时此影响消失.氮化过程需要很大的氨流量,才能保证...通过无定型磷酸铝在大约800℃的高温下同氨反应,制备了新型催化材料氮化磷酸铝.考察了磷酸铝粒度、氨流量和氮化温度对制备的影响.实验发现材料粒径对氮化有一定的影响,粒径小于0.25 mm时此影响消失.氮化过程需要很大的氨流量,才能保证较快的氮化速度.氨流量低时,反应速度太慢,氮化时间很长.氮化速度随着氮化温度的升高而加快.实验还发现800℃下氮化已有明显的磷损失,氮化开始5 h P/Al(原子数比)由1降至0.75左右,然后保持恒定.建立了描述氮化过程中样品的氮含量随氮化时间变化的一级表观动力学方程,该方程能较好的拟合实验数据.展开更多
文摘A dynamic method for investigating the molding process and the mechanical strength of solid catalyst was presented.By means of two sets of equipment(catalyst molding process analyzer CMPA and catalyst mechanical properties tester CMPT) designed and fabricated by the authors in laboratory, the dynamic study for Fe-Cr WGSR catalyst pellets was carried out based on the orthogonal experimental design,the effects of some factors in the molding process of Fe-Cr WGSR solid catalyst on the mechanical strength of catalyst pellets were systematically examined,and the molding conditions were optimized. The results showed that there existed the relationship between catalyst pellet density and compact pressure,and the concept of macroscopic elastic modulus was introduced.Furthermore,the remarkable factors (such as predensification process and calcination temperature) affectng Y 0 factors,macroscopic elastic modulus E ′,rate of densification and side crushing strength were also investigated.
文摘通过无定型磷酸铝在大约800℃的高温下同氨反应,制备了新型催化材料氮化磷酸铝.考察了磷酸铝粒度、氨流量和氮化温度对制备的影响.实验发现材料粒径对氮化有一定的影响,粒径小于0.25 mm时此影响消失.氮化过程需要很大的氨流量,才能保证较快的氮化速度.氨流量低时,反应速度太慢,氮化时间很长.氮化速度随着氮化温度的升高而加快.实验还发现800℃下氮化已有明显的磷损失,氮化开始5 h P/Al(原子数比)由1降至0.75左右,然后保持恒定.建立了描述氮化过程中样品的氮含量随氮化时间变化的一级表观动力学方程,该方程能较好的拟合实验数据.
