Potassium-promoted Mo/MWCNTs catalysts for effective partial oxidation of 1-dodecanol to 1-dodecanal

• Selective oxidation of 1-dodecanol with air over Mo/MWCNTs and K/Mo/MWCNTs.
• Preparation and characterization of Mo/MWCNTs and K/Mo/MWCNTs catalysts.
• Effects of reaction parameters for catalytic oxidation of 1-dodecanol.
• Apparent activation energies for formation of 1-dodecanal and dodecene isomers.
• Superior catalytic performance with 2K/Mo/MWCNTs catalyst.

Multiwall carbon nanotubes supported MoO3 (Mo/MWCNTs) and potassium containing Mo/MWCNTs (K/Mo/MWCNTs) catalysts were prepared and characterized with XRD, N2-physisorption, SEM, TEM, NH3-TPD, and TGA/DTA. Increasing the Mo content (5–15 wt%) in Mo/MWCNTs samples diminished BET surface area and pore volume with concomitant increase of MoO3 particle size. Potassium addition to Mo/MWCNTs resulted in apparent decrease of their acid amounts and MoO3 particle sizes. These catalysts were utilized for selective oxidation of 1-dodecanol (DCOL) with air to obtain 1-dodecanal (DCAL). Various reaction parameters were investigated. It was found that K/Mo/MWCNTs exhibited much better catalyst performance than Mo/MWCNTs. Potassium loading on Mo/MWCNTs greatly enhanced DCOL conversion, DCAL selectivity, and catalyst stability due to smaller MoO3 particles and decreased acid sites.

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