Features of Thermocatalytic Cracking of Polypropylene in the Presence of Potassium Polytitanate and Zeolite Catalysts  

作　　者：Nikita Zherdetsky Alexander Gorokhovsky Roman Borisov Valentin Atlasov 

机构地区：[1]Department of Chemistry and Chemical Technology of Materials,Yuri Gagarin Saratov State Technical University,Saratov 410054,Russian Federation [2]A.V.Topchiev Institute of Petrochemical Synthesis RAS,Moscow 119991,Russian Federation

出　　处：《Journal of Harbin Institute of Technology(New Series)》2025年第1期58-66,共9页哈尔滨工业大学学报(英文版)

摘　　要：A comparative study of products of thermal and thermocatalytic cracking of polypropylene(PP) in the presence of potassium polytitanate(PPT) synthesized by treatment of TiO_(2)(rutile) powder with molten mixture of KOH and KNO_(3) taken in a weight ratio of 30∶30∶40 has been carried out.It was shown that the studied type of PPT powder exhibits catalytic properties in the reaction of thermal decomposition of PP,compared to the effect of commercial zeolite catalyst CBV-780 traditionally used for this purpose.Based on the analysis performed,the differences in the mechanism of catalytic action of PPT and the zeolite were considered.The reasons for the observed differences in the composition of PP cracking products and in the rate of coke formation on the surface of studied catalysts were analyzed.Considering the obtained results,it has been proposed that the CBV-780 catalyst promoted more intensive production of the gaseous hydrocarbons compared to PPT,due to higher specific surface area(internal surface) accessible for relatively light and small-sized hydrocarbon products of cracking.However,intensive coke formation on the outer surface of the microporous zeolite contributes to the blocking of transport channels and the rapid loss of catalytic action.At the same time,PPT,which initially has a smaller specific surface area,retains its catalytic activity significantly longer due to slit-shaped flat pores and higher transport accessibility of the inner surface.

关 键 词：POLYPROPYLENE catalytic cracking potassium polytitanate ZEOLITE reaction mechanism RECYCLING 

分 类 号：TQ426[化学工程]