Confinement effect of carbon nanotubes on the product distribution of selective hydrogenation of cinnamaldehyde

Abstract

Abstract:

The catalytic activity of metal catalysts can be modulated by confinement within the channels of carbon nanotubes (CNTs). Here, we show that the product distribution of cinnamaldehyde hydrogenation can be modified by confinement of Ru nanoparticles in CNTs. A catalyst composed of Ru nanoparticles dispersed on the exterior walls of CNTs gave hydrocinnamaldehyde as product. In contrast, confinement of the Ru nanoparticles within CNT channels facilitated hydrogenation of C=O bonds and complete hydrogenation, and both cinnamyl alcohol and hydrocinnamyl alcohol formed in addition to hydrocinnamaldehyde. High-resolution transmission electron microscopy, Raman spectroscopy, hydrogen temperature-programmed reduction, and hydrogen temperature-programmed desorption were used to investigate the characteristics of the catalysts. The results indicate that the different interactions between the confined Ru nanoparticles and the exterior and interior walls of the CNTs, as well as spatial restriction and enrichment within the narrow channels likely play important roles in modulation of the product distribution.

Key words: Carbon nanotubes, Confined catalysis, Ruthenium, Selective hydrogenation, Cinnamaldehyde, Selectivity modulation

Hongfei Ma, Tie Yu, Xiulian Pan, Xinhe Bao. Confinement effect of carbon nanotubes on the product distribution of selective hydrogenation of cinnamaldehyde[J]. Chinese Journal of Catalysis, 2017, 38(8): 1315-1321.

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