Al含量对Pt-S_2O_8^(2-)/ZrO_2-Al_2O_3型固体超强酸催化剂异构化性能的影响  

Effect of Al Contents on the Isomerization Performance of Solid Superacid Pt-S_2O_8^(2-)/ZrO_2-Al_2O_3

作　　者：宋华[1] 董鹏飞[1] 张旭[1] 

机构地区：[1]东北石油大学化学化工学院,大庆163318

出　　处：《高等学校化学学报》2010年第7期1426-1430,共5页Chemical Journal of Chinese Universities

基　　金：中国石油天然气股份有限公司科技风险创新研究项目(批准号:07-06D-01-04-03-02)资助

摘　　要：通过向S2O82-/ZrO2催化剂中同时引入适量的Pt和Al2O3,制备出了具有较高催化性能和高稳定性的Pt-S2O82-/ZrO2-Al2O3型固体超强酸催化剂.以正戊烷异构化反应为探针,考察了Al含量对催化剂的异构化性能的影响,并采用XRD,BET,FTIR,TPR,TG-DTA,NH3-TPD和ICP手段对催化剂进行了表征.结果表明,Al能够延迟ZrO2的晶化温度,抑制硫的分解;Al能够增加催化剂的比表面积,增强硫氧键的结合,提高催化剂的还原性能,增加催化剂的酸强度和酸总量.当Al2O3质量分数为2.5%时,Pt-S2O82-/ZrO2-Al2O3固体超强酸催化剂的催化活性最高,正戊烷异构化收率可达60.02%,选择性在98.2%以上.High catalytic activity and stability Pt-S2O82 -/ZrO2-Al2O3 solid superacid catalysts were prepared by simultaneously introducing the appropriate amount of Pt and Al2O3 into S2O28 -/ZrO2 catalyst. The effects of Al contents on the performance of catalysts was studied by n-pentane isomerization as a probe reaction and the catalysts were characterized by XRD,BET,FTIR,TPR,TG-DTA,NH3-TPD and ICP etc. The results show that Al can delay crystallization temperature of the ZrO2,inhibit the decomposition of sulfur. Al can also increase the surface area of catalyst,strengthen the combination between S and O key,improve the redox performance of the catalyst and increase acid strength and total acid of catalyst. With the mass fraction of Al2O3 is 2. 5% ,the catalytic activity of Pt-S2O82 -/ZrO2-Al2O3 solid superacid catalysts is the best. The isopentane yield can reach 66. 2% and the selective is larger than 98. 2% .

关 键 词：固体超强酸 催化剂 S2O28-/ZrO2 异构化 Al2O3含量 

分 类 号：O643.3[理学—物理化学]