Effects of steam on toluene hydrogenation over a Ni catalyst

Ryosuke Atsumi, Keisuke Kobayashi, Cui Xieli, Tetsuya Nanba, Hideyuki Matsumoto, Keigo Matsuda, Taku Tsujimura

Research output: Contribution to journalArticle

Abstract

The catalytic toluene hydrogenation over Ni/SiO2 was carried out using H2 or a H2/H2O mixture. The toluene conversion and MCH selectivity were evaluated under partial steam pressures 0−10 kPa, at H2/toluene molar ratios 1–5, and at temperatures 393−453 K. In the absence of steam, toluene conversion increased with increasing H2 partial pressure, and the MCH selectivity decreased with increasing temperature. In the presence of steam, the toluene conversion showed near-constant activities over the entire range of steam partial pressures, and the MCH selectivity increased with increasing steam partial pressure. This result indicated that the addition of steam inhibited byproduct formation. To clarify the effects of steam on the side-reaction, the byproducts composition was analyzed using a gas chromatograph. The results showed that the addition of steam inhibited demethylation, the ring-opening reaction of MCH, the disproportionation of toluene, and isomerization to convert six-membered ring compounds into five-membered ring compounds.

Original languageEnglish
Article number117374
JournalApplied Catalysis A: General
Volume590
DOIs
Publication statusPublished - 2020 Jan 25
Externally publishedYes

Keywords

  • Hydrogen carrier
  • Low-grade hydrogen
  • Methylcyclohexane
  • Nickel catalyst
  • Toluene hydrogenation

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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  • Cite this

    Atsumi, R., Kobayashi, K., Xieli, C., Nanba, T., Matsumoto, H., Matsuda, K., & Tsujimura, T. (2020). Effects of steam on toluene hydrogenation over a Ni catalyst. Applied Catalysis A: General, 590, [117374]. https://doi.org/10.1016/j.apcata.2019.117374