Improved catalytic stability of Pt/TiO2 catalysts for methylcyclohexane dehydrogenation via selenium addition. (15th November 2022)

• Record Type: Journal Article
• Authors: Ito, Hiroya; Oshima, Kazumasa; Yamamoto, Tsuyoshi; Ting, Kah Wei; Toyao, Takashi; Sugiyama, Takeharu; Kato, Yuzuru; Morita, Kentaro; Ohashi, Asuka; Kishida, Masahiro
• Is Part Of: International journal of hydrogen energy. Volume 47:Number 91(2022)
• Page Start: 38635
• Page End: 38643
• Publication Date: 2022-11-15
• Subjects: Methylcyclohexane dehydrogenation -- Pt/TiO2 catalyst -- Selenium addition -- Stability; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2022.09.055
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: To improve the catalytic activity of Pt catalysts for methylcyclohexane (MCH) dehydrogenation, which is utilized for hydrogen transportation, the effects of the addition of Se on the performance of Pt/TiO2 catalysts were investigated. In Se/Pt/TiO2 catalysts, even a small amount of Se addition (Se/Pt = 0.01) improved the catalyst stability. Se was highly dispersed on the Pt/TiO2 surface, without volatilizing in a reducing atmosphere at temperatures below 450 °C, and did not form an alloy with Pt. The analysis of adsorption-desorption characteristics revealed that the addition of Se promoted the desorption of products, including the main product, toluene. Moreover, an electron donation effect from Se to Pt was observed by FT-IR measurement after the reduction. The desorption characteristic caused by the electron donation effect suppressed the deterioration of the catalyst and allowed stable catalytic activity toward the MCH dehydrogenation reaction. Highlights: Se modification onto Pt/TiO2 catalyst improved the stability for MCH dehydrogenation. The stability was significantly improved even with only Se/Pt = 0.01 content. Se was highly dispersed on the Pt/TiO2 surface without alloying with Pt. The Se addition promoted the desorption of the product, leading to high stability.