摘要
报道了浸水处理后高强度A110－5Q球形氨合成催化剂各种物理化学性能的变化考察了两种铁酸钾KFeO_2、K_1＋x_Fe_11o_17（x＝o～1）的水溶性对溶铁氨合成催化剂（氧化态）中存在的水溶性钾和非水溶性钾进行了归属水溶性钾主要集中在Fe_3O_4晶粒间的边界上，以KFeO_2、KOH、K_2CO_3和KAlO_2等物相存在；非水溶性钾则是高度分散于Fe_3O_4晶粒内的非计量化合物K_1+x_Fe_11O_17（x＝0～1）水溶性钾量远高于非水溶性钾的含量，但前者对催化活性的作用却不如后者明显，对这一现象的本质原因进行了深入的探讨。
The effects of water-soaking on properties of the fused-iron catalyst for ammonia synthesis were investigated.The results show that both the mechanical strength and catalytic activity of catalyst All0－5Q decline after water-soaking,while its specific surface area and the pore volume increase.Both the water-soluble potassium and water-insoluble potassium exist in the fused-iron catalyst,and usually the amount of the former is far more than that of the latter.Two kinds of potassium ferrites, KFeO_2 and K_1＋_xFe_(ll)O_(17)（x＝ 0～1） were prepared and their leaching processes were investigated respectively.KFeO_2 can be readily hydrolyzed.In contrast to KFeO_2,potassium can not be resdily dissolved out from K_(1+x)Fe_(11)O_(17) by Water.It is suggested that KFeO_2 with KOH,KAIO_2,K_2CO_3,etc belongs to the water-soluble potassium,which occurs mainly on the bounderies of the crystal grains of Fe_3O_4,While K_(1＋x)Fe_(ll)O_(l7)belongs to the water-insoluble potassium,which is uniformly distributed in the grains of Fe_3O_4.Both watersoluble potassium and water-insoluble potassium in the fused-iron catalyst promote the catalytic activity of ammonia synthesis,but the contribution of the former is less than that of the latter.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1996年第5期581-586,共6页
CIESC Journal
关键词
氨合成
催化剂
水溶性钾
钾
催化活性
合成氨
fused-iron catalyst for ammonia synthesis,water-soaking,water-soluble potassium,water-insoluble potassium
