Conversion of light naphtha into aromatic hydrocarbons (part 3) effects of pre-sulfiding of ZnH-ZSM-5 on catalytic performance and stability of zinc

Shigeki Nagamatsu, Makoto Inomata, Kozo Imura, Hideo Nagata, Masahiro Kishida, Katsuhiko Wakabayashi

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2 Citations (Scopus)

Abstract

The effects of steaming and hydrogen reduction of ZnH-ZSM-5, concerning catalytic activity in aromatization of n-hexane were examined to evaluate the stability of ZnH-ZSM-5 in commercial operating condions, in comparison with H-ZSM-5. Steaming at high temperature resulted in greater drop in the yield of aromatics over H-ZSM 5 than that over ZnH-ZSM-5. Hydrogen reduction had little effect on the yield of aromatics over H-ZSM-5, while a remarkable drop in the yield of aromatics was observed over ZnH-ZSm-5. It was found that zinc oxide in ZaH-ZSM-5 was reduced with hydrogen to give metallic zinc, which was then vaporized from the catalyst. This vaporization led to an irreversible decline in the activity for aromatization. Pre-sulfiding of ZnH-ZSM-5 was found to be effective in preventing the vaporization of zinc, by conducting thermogravimetric measurement of vaporized zinc from the catalyst. ZnH-ZSM-5 was pre-sulfided, using thiophene, dimethylsulfide, and disulfidecarbonate, as sulfiding agents, which reduced not only the vaporization of zinc, but also the cracking activity to yield light gases, such as CH4 and C2H6.

Original languageEnglish
Pages (from-to)302-309
Number of pages8
JournalSekiyu Gakkaishi (Journal of the Japan Petroleum Institute)
Volume41
Issue number5
DOIs
Publication statusPublished - Jan 1 1998

All Science Journal Classification (ASJC) codes

  • Fuel Technology
  • Energy Engineering and Power Technology

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