caa a22 4500 445388730 CHVBK 20180317143039.0 cr unu---uuuuu 170323e20110201xx s 000 0 eng 10.1007/s11144-010-0258-z doi (NATIONALLICENCE)springer-10.1007/s11144-010-0258-z Effect of acidity and diffusibility on coke deactivation over nano-sized HZSM-5 zeolites [Elektronische Daten] [Lin Sun, Xiangsheng Wang, Jichun Li, An Ma, Hongchen Guo] Four series of nano-sized HZSM-5 zeolite catalysts were prepared with different steaming and HNO3 leaching processes. These samples were studied by XRD, NH3-TPD, FT-IR, n-hexane and cyclohexane adsorption, and fixed-bed aromatization of C4 liquefied petroleum gas (C4 LPG). Results show that, with the steaming temperature increasing, the acidity of catalyst decreased gradually, which was attributed to the removal of Al species from the framework of the zeolite. When steaming is combined with acid leaching, we found that acid leaching-steam catalysts exhibit stronger acidity than steam-acid leaching catalysts. Besides, acid leaching also played an important role in enhancing the diffusibility of catalysts. Catalysts which underwent acid leaching twice exhibit the best microporous diffusibility. Through correlating the acidity and diffusibility of the catalysts with their aromatization performance, it is found that the product distribution of aromatization is mainly determined by catalyst acidity rather than diffusibility. On the other hand, the average coking speed of the catalysts is not only influenced by the acidity of the catalyst, but also by its microporous diffusibility. The improvement of microporous diffusibility remarkably favors suppressing the coking deactivation of nano-sized ZSM-5 zeolite in C4 LPG aromatization. Akadémiai Kiadó, Budapest, Hungary, 2010 Steaming nationallicence Acid leaching nationallicence Acidity nationallicence Diffusibility nationallicence Aromatization nationallicence Nano-sized HZSM-5 zeolite nationallicence Sun Lin Department of Catalytic Chemistry and Engineering, State Key laboratory of Fine Chemicals, Dalian University of Technology, 116012, Dalian, Liaoning, People's Republic of China aut Wang Xiangsheng Department of Catalytic Chemistry and Engineering, State Key laboratory of Fine Chemicals, Dalian University of Technology, 116012, Dalian, Liaoning, People's Republic of China aut Li Jichun Institutes of Petrochemicals, PetroChina, 100007, Beijing, China aut Ma An Institutes of Petrochemicals, PetroChina, 100007, Beijing, China aut Guo Hongchen Department of Catalytic Chemistry and Engineering, State Key laboratory of Fine Chemicals, Dalian University of Technology, 116012, Dalian, Liaoning, People's Republic of China aut Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 102/1(2011-02-01), 235-247 1878-5190 102:1<235 2011 102 11144 https://doi.org/10.1007/s11144-010-0258-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11144-010-0258-z text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sun Lin Department of Catalytic Chemistry and Engineering, State Key laboratory of Fine Chemicals, Dalian University of Technology, 116012, Dalian, Liaoning, People's Republic of China aut NATIONALLICENCE 700 1- Wang Xiangsheng Department of Catalytic Chemistry and Engineering, State Key laboratory of Fine Chemicals, Dalian University of Technology, 116012, Dalian, Liaoning, People's Republic of China aut NATIONALLICENCE 700 1- Li Jichun Institutes of Petrochemicals, PetroChina, 100007, Beijing, China aut NATIONALLICENCE 700 1- Ma An Institutes of Petrochemicals, PetroChina, 100007, Beijing, China aut NATIONALLICENCE 700 1- Guo Hongchen Department of Catalytic Chemistry and Engineering, State Key laboratory of Fine Chemicals, Dalian University of Technology, 116012, Dalian, Liaoning, People's Republic of China aut NATIONALLICENCE 773 0- Reaction Kinetics, Mechanisms and Catalysis Springer Netherlands 102/1(2011-02-01), 235-247 1878-5190 102:1<235 2011 102 11144 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer