The catalytic oxidation of organic contaminants in a packed bed reactor

Abstract

Abstract--The catalytic oxidation of several hydrocarbons was studied over noble metal and metal oxide catalysts. A fast empirical method was developed to determine the minimum operating temperature required to guarantee complete conversion of the hydrocarbon.The influence of the operating parameters such as the inlet concentration and residence time, as well as the chemical character of the component to be oxidized, have been investigated. The results can be described satisfactorily by a simple isothermal, plug flow reactor model and first-order reaction kinetics. In the case of simultaneous oxidation of different components a significant mixture effect was not observed. The presence of water in the feed did significantly inhibit the oxidation of alkanes.Of the applied catalysts, Pt was the most effective for the combustion of the alkenes, whereas Pd showed a higher activity for the oxidation of alkanes.

Catalytic Destruction of Dichloromethane Using Perovskite-Type Oxide Catalysts

“…As the humidity rises, the conversion declines as the temperature declines. Although several studies 16,22,26 have reported that the presence of water vapor affects conversion, depending upon the catalyst and the temperature, the results herein illustrate that the effects of water vapor markedly inhibit the conversion of LaCoO 3 . This inhibition probably reflected the competition of the CH 2 Cl 2 with water for adsorption on the active sites.…”

“…The reduction of the activity might be associated with the competitive adsorption of water vapor and CH 2 Cl 2 at active reaction sites. Although several works 26,30,31 have stated that the presence of water vapor affects the extent of conversion in a manner that depends on the catalyst and the temperature, the results obtained herein indicate that water vapor only weakly suppressed conversion when a LaCoO 3 composite catalyst was used. Thus, increased humidity at the inlet of the gas stream decelerates the conversion of CH 2 Cl 2 over the catalyst.…”

Effect of hydrocarbons on the efficiency of catalytic reactor of detritiation system in an event of fire

“…The production of tritiated hydrocarbons over the LTR may decrease the overall detritiation performance of the DS. The combustion of hydrocarbons has been extensively reported in the literature [9][10][11]. However, the literature concerning the production of tritiated hydrocarbons over the LTR is limited [12].…”

A Study of White‐Spirit Vapor Combustion on Pt/Al2O3 Catalyst

“…The combustion occurs by the reaction of a VOC molecule originating from the gas phase and a catalyst site in an oxidized state. Even if it is criticized by some authors (Vannice [2]), this model proved to be adequate in describing combustion kinetics on the Pt catalyst, even though it emphasizes the presence of the Pt species in the oxidized state on the catalyst surface [3]. However, it is of worth to note that the Mars-van Krevelen and Rideal-Eley rate expressions are formally identical and can be transformed reciprocally by reparameterization [4].…”

“…Van de Beld et al [3] investigated the influence of reaction products H 2 O and CO 2 on the ethylene and propane combustion kinetics (individually or in binary mixture) on a Pd/Al 2 O 3 catalyst. Experimental data obtained in this work show that water adsorbs on the surface of the catalyst, introducing a braking effect of the transformation kinetics.…”