Literature review: deactivation of catalysts in the oxidation of volatile organic compounds

Catalytic abatement of trichloroethylene over Mo and/or W-based bronzes

“…In fact, the most active catalyst is not the catalyst with highest W-content, but the catalysts containing both W and Mo (MW25, MW50 and MW75). This can be related to the higher mobility of the oxygen species from the bulk to the surface measured by isotopic exchange of 18 O 2 . For that reason, although the role of acidity cannot be ruled out, the mobility of oxygen from the bulk to the surface and its total amount is the main parameter that governs activity in the oxidation of TCE in M-W based bronzes.…”

“…The temperature was raised from 25ºC to 650ºC at a heating rate of 10ºC min -1 . In all cases, the catalyst (0.160 g) was exposed to a 2% 18 The flow rate through the reactor was set at 400 ml min -1 and the gas hourly space velocity (GHSV) was maintained at 15000 h -1 . The residence time, based on the packing volume of the catalyst, was 0.24 s. The chlorinated compound was injected into the dry air with a syringe pump in order to obtain a TCE concentration of 1000 ppm and the reaction temperature was varied from 100 to 550°C in steps of 50°C.…”

“…Temperature programmed 18 O 2 isotopic exchange measurements (TPIE) have been performed on samples heat-treated at 500ºC, in order to study the nature of the oxygen species participating in the combustion reaction [49].…”

“…Usually, two types of catalysts have been studied for the chlorinated VOCs abatement: metal oxides [8][9][10][11][12][13][14][15][16][17][18][19][20], either single (e.g. chromium oxide) or mixed (e.g.…”

Utilization of Volatile Organic Compounds as an Alternative for Destructive Abatement

“…Sulfur is a well-known catalyst poison, as discussed above, which is studied very widely in different applications [332][333][334]. There exist different solutions to avoid sulfur poisoning such as addition of sulfide-forming metal or an oxide sorbent to the catalyst [55].…”