Reaction kinetics of ethane partial oxidation to acetic acid

Abstract

The partial oxidation of ethane to ethylene and acetic acid on supported MoVNbPd/TiO 2 (P25 of Degussa) has been investigated. Pd was added in a nano-metallic form. The catalyst composition was also different from similar studied catalysts. This results in a better selectivity towards acetic acid formation. The reaction was carried out in a tubular reactor at temperature range 225-275 °C, total pressure range 0-200 psig and oxygen percentage in the feed gas of 10-40%. The feed gas contains ethane and oxygen. In this work, we develop a kinetic model for the reaction for the developed catalyst. In this model, we assume that oxidation reactions take place on different sites; ethane oxidation takes place on one site, ethylene oxidation on another site, and CO is oxidized to CO 2 on a third site. The model exhibits good agreement with the experimental data.

Oxidative dehydrogenation of ethane over mixed metal oxide catalysts: Autothermal or cooled tubular reactor design?

“…Several sets of sequences of elementary steps have been proposed in the literature for ODHE over supported vanadia, 5,7‐11,50 MoVNb, 51,52 and MoVTeNbO catalysts 21,31‐34,53,54 . We propose herein a sequence of elementary steps (Table 1) that under certain conditions reduces to an expression that is first order in ethane and zero order in oxygen and water, consistent with reaction orders measured experimentally.…”

“…ODHE rates were found to be first order in ethane and zero order in oxygen at three different partial pressures of ethane (6-30 kPa) (Figure 3), analogous to the report of Annamalai et al in which ODHE rates were found to increase linearly with ethane partial pressure and to be invariant in oxygen partial pressure. 21 Several sets of sequences of elementary steps have been proposed in the literature for ODHE over supported vanadia, 5,[7][8][9][10][11]50 MoVNb, 51,52 and MoVTeNbO catalysts. 21,[31][32][33][34]53,54 We propose herein a sequence of elementary steps (Table 1) that under certain conditions reduces to an expression that is first order in ethane and zero order in oxygen and water, consistent with reaction orders measured experimentally.…”

Carbon neutral manufacturing via on-site CO2 recycling

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Commercial Gold Complexes Supported on Functionalised Carbon Materials as Efficient Catalysts for the Direct Oxidation of Ethane to Acetic Acid

“…Mo-V-M-O (M = Al, Fe, Cr or Ti) complex metal oxide catalysts were also tested [23]. Mo-V materials, frequently doped with other elements, supported on silica [24] and titania [25][26][27][28][29][30] were also described. Molybdo(vanado)phosphoric heteropoly acids with Keggin structure on oxide supports (SiO 2 , Al 2 O 3 , TiO 2 ) are found in the literature [31].…”