The kinetics of n-butane [106-97-8] oxidn. to maleic anhydride (I) [108-31-6] at 300-340° is studied on a very active and selective V2O5-H3PO4 catalyst and utilizing a new type of reactor which has the catalytic bed overlaying several cylindrically shaped pellets with a central axial hole. The oxidn. of n-butane takes place along 2 parallel routes: one selective to I, which depends, according to a Langmuir-Hinshelwood model, on the hydrocarbon concn., and the second to CO2, which is independent from the n-butane concn. Both reactions have a slight dependence on the O concn. that, however, does not change the selectivity in I formation. At >60% conversion, the I undergoes a successive oxidn. to carbon oxides; the rate equation depended on the I concn. and on the ratio of the O and hydrocarbon residual concns. At total conversion, the yield of I obtained is very low. The rate equations found are utilized to predict the best operating conditions to obtain high yields of I. [on SciFinder(R)]
n-Butane oxidation to maleic anhydride on vanadium-phosphorus oxides: kinetic analysis with a tubular flow stacked-pellet reactor
CENTI, Gabriele;
1985-01-01
Abstract
The kinetics of n-butane [106-97-8] oxidn. to maleic anhydride (I) [108-31-6] at 300-340° is studied on a very active and selective V2O5-H3PO4 catalyst and utilizing a new type of reactor which has the catalytic bed overlaying several cylindrically shaped pellets with a central axial hole. The oxidn. of n-butane takes place along 2 parallel routes: one selective to I, which depends, according to a Langmuir-Hinshelwood model, on the hydrocarbon concn., and the second to CO2, which is independent from the n-butane concn. Both reactions have a slight dependence on the O concn. that, however, does not change the selectivity in I formation. At >60% conversion, the I undergoes a successive oxidn. to carbon oxides; the rate equation depended on the I concn. and on the ratio of the O and hydrocarbon residual concns. At total conversion, the yield of I obtained is very low. The rate equations found are utilized to predict the best operating conditions to obtain high yields of I. [on SciFinder(R)]Pubblicazioni consigliate
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