Role of water in formic acid decomposition

Abstract

Formic acid decomposes primarily to CO and H2 0 in the gas phase, but to CO, and H, in

Ab initio and kinetic modeling studies of formic acid oxidation

“…(+M) (R2). The absence of radical producing dissociation channels has been confirmed by Klatt et al [23] in shock tube experiments at temperatures up to 2450 K and in a number of theoretical studies [35,[56][57][58]. For the present purposes, the rate constants were drawn from the theoretical work of Chang et al [35], which is in good agreement with most available experimental data.…”

Reductive de-polymerization of kraft lignin for chemicals and fuels using formic acid as an in-situ hydrogen source

“…The results revealed that an ethanol content of 50% (v/v) in the co-solvent system produced the maximum DL yield (~ 90 wt.%) and the lowest SR yield (< 1 wt.%), which is in good agreement with the results of the previous studies on the hydrothermal liquefaction of biomass . As the ethanol content in the co-solvent system increased to > 50% (v/v), the DL yield decreased, accompanied by a drastic increase in SR yield, which may be related to a decreasing effect of hydrolytic depolymerization (Akiya, 1998). As such, with respect to DL yield, the 50/50 (v/v) co-solvent of ethanol-water was found to be the most effective solvent for reductive depolymerization of KL.…”

Catalytic depolymerization of alkali lignin in subcritical water: influence of formic acid and Pd/C catalyst on the yields of liquid monomeric aromatic products

“…The results of the hydrothermal reactions of 1.0 g of FA at 265 °C, with reaction time from zero to 3 h, both in the presence and absence of Pd/C are presented in Table 1. The results show that both reaction times and Pd/C catalyst influenced the hydrothermal conversion of formic acid into hydrogen and carbon dioxide according to Equation (1) [19];. Equation (1) shows that the standard enthalpy change ( H°2 98K ) for the hydrothermal reaction of formic acid is +32.1 kJ mol -1 .…”

“…Formic and acetic acids can be produced from biomass and lignin under certain hydrothermal conditions [16][17][18] and using them for lignin processing into valuable products will improve sustainability. Besides, formic acid can easily be reformed into hydrogen [19] required for the hydrogenolysis and/or hydrodeoxygenation of lignin into valuable chemicals [20]. Xu et al [20], used formic acid (FA) for the depolymerization and hydrodeoxygenation of Organosolv lignin obtained from switch grass in the presence of 20 wt% Pt/C catalysts at 280 °C.…”

“…Pd/C has been used in literature for hydrodeoxygenation of bio-oils and oxygenates in alcohols [21] and a recent publications showed that Pd/C can be effective for deoxygenation of triglycerides in subcritical water with external hydrogen supply [22]. At first, the hydrothermal reaction of FA was investigated at the given reaction conditions to determine the influence of reaction time and the presence of Pd/C catalyst on its ultimate conversion according to the equation (1) [19];…”