三氧化二铁晶型对铁铬系高温变换催化剂性能的影响  

Effect of Fe_2O_3 crystal structure on the performance of Fe_2O_3/Cr_2O_3 high temperature water gas shift catalyst

作　　者：赵志利[1] 李建伟[2] 陈标华[2] 

机构地区：[1]西北化工研究院,陕西西安710600 [2]北京化工大学可控化学反应科学与技术基础教育部重点实验室,北京100029

出　　处：《现代化工》2006年第z2期143-146,共4页Modern Chemical Industry

摘　　要：以硝酸亚铁为原料,采用共沉淀法分别制备了α型、γ型和非晶体型3类晶型的Fe2O3高温变换催化剂,并对所制备催化剂的性能进行了对比评价。结果表明:①Fe2O3的晶型对变换催化剂的性能有较大的影响。尽管γ-Fe2O3晶型催化剂比α-Fe2O3晶型催化剂具有更高的初始活性,但其结构的不稳定性造成催化剂强度低、密度大和耐热性能差的缺点;②非晶体型态Fe2O3极小的微观粒子尺寸和宏观上的非晶态物质“异向同性”特性,使得所制备催化剂具有较大的比表面积、相对低的密度、高强度、高耐热性和更高的活性稳定性等优点;③非晶体型态Fe2O3催化剂的综合性能最高,α-Fe2O3晶型的次之,而γ-Fe2O3晶型的综合性能最低。其中,非晶体型态Fe2O3催化剂在比γ-Fe2O3晶型催化剂强度提高30%的情况下,堆密度可降低15%左右,且其耐热后的活性(CO变换率)比γ-Fe2O3型催化剂提高6个百分点。Three types of Fe_2O_3-based high temperature water gas shift catalysts were prepared by co-precipitation with(Fe(NO_3)_2) as a material,and their crystal phase were α-,γ-and amorphous type,respectively.The performance of different catalysts prepared here were evaluated and compared.The results showed that:①The initial crystal type of Fe_2O_3 had an obvious influence on the performance of catalyst.Though the catalyst formed by γ-Fe_2O_3 had higher initial activity than that of formed by α-Fe_2O_3,but γ-Fe_2O_3 structural instability would result in lower catalyst intensity,higher particle density and lower heat resistance performance.②The microcosmic particle size and the global characteristic of amorphous Fe_2O_3 catalyst have the advantages of bigger specific surface area,lower particle density,higher intensity,better heat-resistance performance and better activity stability.③The comprehensive performance ordered from high to low was amorphous Fe_2O_3,α-Fe_2O_3 and γ-Fe_2O_3.Among them,the bulk density of the amorphous Fe_2O_3 catalyst reduced by about 15% compared with crystal γ-Fe_2O_3 catalyst,its intensity enhanced 30%,also its activeness after heat-resistance(the CO rate of shift) catalyst enhanced 6 percentage points compared with the crystal γ-Fe_2O_3.

关 键 词：高温变换催化剂 Fe2O3晶型 非晶体型态 催化剂性能 

分 类 号：TQ138.11[化学工程—无机化工]