Abstract
The Zn and Ni were introduced into HZSM-5 zeolite by ion exchange method with aqueous solutions of Zn(NO3)2 and Ni(NO3)2, to investigate the catalytic activity and selectivity of modified Zn-HZSM-5 and Ni-HZSM-5 catalysts for conversion of butane-butylenes technical mixtures in a fixed-bed stainless-steel reactor (Twin Reactor System Naky) at 450�C, at atmospheric pressure for Zn-HZSM-5 and at 4 atm. total pressure for Ni-HZSM-5 and at a space velocity (WHSV) of 1h-1. The catalysts were characterized using XRD, SEM, and NH3-TPD analysis for their structure, morphology and acidity. The catalytic activity of the same catalyst were examined during over 10 catalytic tests (with regeneration of catalyst after each test) using mixtures of butanes-butylenes.
Highlights
The catalytic activity of of catalyst after each the same catalyst were test) using mixtures of butanes-butylenes
We present the results obtained in the conversion of butane-butylenes technical mixtures in a fixed-bed stainlesssteel reactor over Zn-HZSM-5 and Ni-HZSM-5 catalysts prepared by ion exchange method with aqueous solutions of Zn(NO3)2 and Ni(NO3)2
It was indicated from the results that the acid sites distribution of the Zn-HZSM-5 or Ni-HZSM-5 changed after the metal incorporation in HZSM-5, the medium and strong acid sites, in the catalysts weakened due the effect of Zn and Ni
Summary
The parent Na-ZSM-5 was synthesized with ethylene glycol as the template organic molecule. HZSM-5 sample was converted by ion exchange with 0.1 M aqueous. The temperature and the amount of desorbed ammonia give information about strength and number of the acid sites. HZSM-5 and Zn-HZSM-5 catalysts is probably the results of the Lewis acid sites created by nickel, and zinc, respectively. It found that the intensity of strong acid sites (Bronsted probably) decreased compare to parent. It was indicated from the results that the acid sites distribution of the Zn-HZSM-5 or Ni-HZSM-5 changed after the metal incorporation in HZSM-5 (the incorporation of the Zn2+and Ni2+ ions into cationic positions), the medium and strong acid sites, in the catalysts weakened due the effect of Zn and Ni. It was found that the intensity of the strong acid sites (Brönsted probably) in the modified zeolite samples decreased compare to HZSM-5
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