助催化剂对固载型催化剂催化氧化重硫醇活性的影响

以含硫醇的模拟汽油为物系,采用改性固载型催化剂进行了脱重硫醇的实验。考察了有机铵类助催化剂含量、催化剂的干燥方式、催化剂含水量等对重硫醇转化率的影响;采用SEM手段对催化剂的形貌进行表征。实验结果表明,有机铵类助催化剂的加入可以提高催化剂催化氧化重硫醇的活性,当催化剂中助催化剂的含量约为0.2%(w)时,催化活性较高;催化剂合适的干燥条件为60℃真空干燥(真空度0.09 MPa)10 h;当催化剂含水量在5%～20%(w)时,其催化活性较高。SEM表征结果显示,活性组分均匀地分布于催化剂的内外表面,充分利用了载体的空间,一定程度上克服了活性组分的流失,增强了催化氧化硫醇的能力。

Effects of Cocatalyst on Catalytic Oxidation Activity of Immobilized Catalyst Towards Heavy Mercaptans

An immobilized catalyst was modified by adding organic amine cocatalyst.The modified catalyst was characterized by means of SEM and was used in removal of heavy mercaptans in a simulated gasoline by catalytic oxidation.The effects of cocatalyst dosage,catalyst drying method and water content in the modified catalyst on its activity were investigated.The results showed that the catalytic activity of the catalyst for removal of heavy mercaptans was improved by adding the cocatalyst.The optimal conditions for the catalyst modification were:cocatalyst content in the catalyst 0.2%(w),drying temperature 60 ℃,drying vacuum degree 0.09 MPa and drying time 10 h,and the proper water content in the catalyst was between 5%-20%(w).The SEM analysis showed that the active components distributed evenly inside and outside the support pores,which made full use of the pore space and inhibited the loss of the active components.