沉淀剂对SO_4^（2－）／ZrO_2－NIO催化性能的影响  

Effects of Precipitants on the Performance of SO_4￣=/ZrO_2-NiO Catalysts

作　　者：王新平[1] 唐新硕[1] 

机构地区：[1]杭州大学化学系,浙江大学高分子系

出　　处：《石油化工》1996年第1期20-27,共8页Petrochemical Technology

基　　金：国家自然科学基金

摘　　要：研究了不同沉淀剂所制备的ＳＯ／ＺｒＯ２－ＮｉＯ催化剂在物性及催化性能上的差异，并通过ＸＲＤ、ＦＴ－ＩＲ、吸附吡啶的ＴＰＤ等方法，探讨了产生差异的原因，认为利用尿素作沉淀剂，增强了ＺｒＯ２－ＮｉＯ之间的作用，抑制Ｎｉ２＋与ＳＯ４２－生成盐，使Ｎｉ离子能成为超强酸中心的组成部分，参于正戊烷的异构化作用．氨水作为沉淀剂时，不能促使ＺｒＯ２与ＮｉＯ之间形成强作用，从而使表面部分Ｎｉ２＋与ＳＯ４２－形成盐。由于使用不同沉淀剂使ＳＯ２４－／ＺｒＯ２－ＮｉＯ在结构上产生的差异，使酸中心强度数目与分布不同，导致催化正戊烷裂解机理不同，提出了正戊烷在这两种不同沉淀剂催化剂上，裂解反应主要途径的不同。n this paper,the influence of the method of preparation on the activity and selectivity ofSO4=/ZrO2-NiO solid super acid catalysts was investigated. Urea and ammonia were used as precipitants;catalysts were prepared by coprecipitation method. The reaction of n-pentane was studied,it was found that SO4=/ZrO2-NiO U (coprecipitation with urea)showed high performance forskeletal isomerization lselecivity to i-pentane was near 100%,but SO4=/ZrO2-NiO A (coprecipitation with ammonia)gave low isomerization performance. The effects of different precipitants wereinvestigated by FT-IR, XRD, TPD analysis after absorbing pyridine. The results indicated thatSO4=/ZrO2-NiOU and,SO4=/ZrO2-NiO A are structurally very different. The mechanism of isomerization of n-pentane on super acid of SO4=/ZrO2-NiO U and SO4=/ZrO2-NiO A has also been discussed.

关 键 词：沉淀剂 催化剂 氨沉淀法 尿素沉淀法 

分 类 号：TQ426.6[化学工程] O652.61[理学—分析化学]