Pt-SO_4^(2-)/ZrO_2-Al_2O_3催化剂的制备及其催化正戊烷异构化性能

Preparation of Pt-SO_4^(2-)/ZrO_2-Al_2O_3 catalyst and its catalytic performance for n-pentane isomerization

制备了Pt-SO42-/ZrO2-A l2O3固体超强酸催化剂,采用XRD,TG-DTA,FT-IR,TPR,SEM,BET,ICP等表征方法对催化剂进行了表征。以正戊烷异构化反应为探针,在高压固定床-色谱联合装置上,评价了催化剂的活性,考察了空速v空、反应温度t、反应压力p和氢与正戊烷摩尔比对正戊烷异构化反应的影响。在t=200℃,p=2.0 MPa,v空=1.5 h-1,n(氢)/n(正戊烷)=4∶1的条件下反应时,正戊烷转化率为72.9%,异戊烷收率为67.6%,异戊烷选择性为92.8%,液收率为94.8%。

Pt-SO2-4/ZrO2-Al2O3 solid superacid catalyst was prepared and characterized by XRD,TG-DTA,FT-IR,TPR,SEM,BET and ICP.The catalyst was evaluated on a lab-scale high pressure microreactor with online chromatogram unit for n-pentane isomerization as a probe reaction.The effects of the mass hourly space velocity v空,temperature t,pressure p and mole ratio of hydrogen to pentane on the n-pentane isomerization were studied.At reaction temperature of 200 ℃,pressure of 2.0 MPa,hydrogen/pentane molar ratio of 4∶1,and v空=1.5 h^-1,the conversion of n-pentane is 72.9%,the yield of isopentane is 67.6%,the selectivity of isopentane is 92.8%,and the yield of liquid product is 94.8%.