The decomposition of formic acid is studied in acontinuous sub- or supercritical water reactor at temperatures {between|in between|among|amongst|involving} 300 and430°C, a {pressure|stress} of 25 MPa, residence {times|occasions|instances} {between|in between|among|amongst|involving} {4|four} and 65 s, and afeedstock concentration of {3|three}.{6|six} wt%. In-situRaman spectroscopy is {used|utilized|employed|utilised|applied|made use of} to {produce|create|generate|make} real-time {data|information} and accuratelyquantify decomposition {product|item|solution} yields of H2, CO2, and CO.Collected spectra are {used|utilized|employed|utilised|applied|made use of} to {determine|figure out|decide|establish|ascertain|identify} {global|international|worldwide} decomposition {rates|prices} and kineticrates for {individual|person} reaction pathways. First-order {global|international|worldwide} Arrhenius parametersare determined as log A (s-1)= 1.{6|six} ± 0.20 and EA = 9.5± 0.55 kcal/mol for subcritical decomposition, and log A (s-1) = 12.56 ± 1.96 and EA = 41.90 ± {6|six}.08 kcal/mol for supercriticaldecomposition. Subcritical and supercritical Arrhenius parameters forindividual pathways are proposed. The variance in {rate|price} parameters is {likely|most likely|probably} dueto {changing|altering} thermophysical properties of water across the {critical|crucial|vital|essential|important} point. Thereis {strong|powerful|robust|sturdy} {evidence|proof} {for a|to get a|for any} surface catalyzed free-radical mechanism responsiblefor {rapid|fast|speedy} decomposition above the {critical|crucial|vital|essential|important} point, facilitated by low density atsupercritical {conditions|circumstances|situations}. Formula of 1415559-47-5 1073371-77-3 custom synthesis PMID:32261617
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