Hydroisomerization performance of platinum supported on ZSM-22/ZSM-23 intergrowth zeolite catalyst

Petroleum Science, June 2013, Volume 10, Issue 2, pp 242-250
Hydroisomerization performance of platinum supported on ZSM-22/ZSM-23 intergrowth zeolite catalyst
Kebin Chi, Zhen Zhao, Zhijian Tian, Sheng Hu, Lijun Yan, Tianshu Li, Bingchun Wang, Xiangbin Meng, Shanbin Gao, Mingwei Tan, Yanfeng Liu
hide
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing, 102249, China
Petrochemical Research Institute, PetroChina Company Limited, Beijing, 100195, China
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, Liaoning, 116023, China
Abstract
Researchers created hydroisomerization catalysts Pt/ZSM-22, Pt/ZSM-23, and Pt/ZSM-22/ZSM-23 by supporting Pt on ZSM-22, ZSM-23, and intergrowth zeolite ZSM-22/ZSM-23, respectively. They characterized the typical physicochemical properties of the catalysts by X-Ray Diffraction (XRD), N2 absorption-desorption, Pyridine-Fourier Transform Infrared (Py-FTIR), Transmission Electron Microscopy (TEM), X-Ray Fluorescence (XRF), Scanning Electron Microscopy (SEM) and NH3-Temperature Programmed Desorption (NH3-TPD).
They evaluated catalyst performance in n-dodecane hydroisomerization in a continuous down-flow fixed bed with a stainless steel tubular reactor. Results indicated that the intergrowth zeolite ZSM-22/ZSM-23 possessed the dual structure of ZSM-22 and ZSM-23. The catalyst Pt/ZSM-22/ZSM-23 had similar pores and weak acidity to Pt/ZSM-22 and Pt/ZSM-23 catalysts. Moreover, Pt/ZSM-22/ZSM-23 catalyst showed a high selectivity in hydroisomerization of long chain n-alkanes to mono-branched isomers. The evaluation results for n-dodecane hydroisomerization indicated that the activity of Pt/ZSM-22/ZSM-23 was the lowest, while the hydroisomerization selectivity was the highest among the three catalysts.
Full Text Source (Subscription or Fee): http://link.springer.com/article/10.1007/s12182-013-0273-6#