Stability of protonic zeolites in the catalytic oxidation of chlorinated VOCs (1,2-dichloroethane)

Catalytic oxidation of trichloroethylene over Fe-ZSM-5: Influence of the preparation method on the iron species and the catalytic behavior

“…Furthermore, it was also observed that the incorporation of iron into the H-ZSM-5 zeolite resulted in lower reaction temperatures for oxidation of TCE irrespective of the method of preparation used. Previous studies [16,18] showed that, the acidity of H-zeolites, especially Brönsted acidic centers, played a fundamental role in the oxidation of Cl-VOC, and the activity was directly related to its acidity. However, the lower acidity of Fe-zeolites suggests that the catalytic activity of the acidic centers is overcome by the redox properties of the iron centers.…”

“…All the samples showed two major desorption peaks. A desorption peak around 180-200 • C was considered as corresponding to weak acid sites, while the peak in the range 350-450 • C was considered as corresponding to strong acid sites [16].…”

Synergistic performance between oxidizability and acidity/texture properties for 1,2-dichloroethane oxidation over (Ce,Cr)xO2/zeolite catalysts

“…However, notable CO and byproducts as well as obvious deactivation by coking are also observed at the same time, because of the poor oxidizing ability of the zeolites. Although the impregnation of transition metal oxides or noble metals is always considered, the synergy between oxides/noble metals and zeolites can hardly reach the best, and thus, the similar problems still exist (Guisnet et al, 2009;Aranzabal et al, 2009;López-Fonseca et al, 2005;Gutiérrez-Ortiz et al, 2003;Chatterjee et al, 1992). CeO 2 -based catalysts, especially CeO 2 -transition metal mixed oxides, have also attracted considerable interest (Harmsen et al, 2001;Wang et al, 2009;de Rivas et al, 2011de Rivas et al, , 2012Yang et al, 2015aYang et al, , 2014Yang et al, , 2015b, since CeO 2 can undergo a rapid and reversible redox cycle of Ce 4 þ '-Ce 3 þ , coupled with its strong interaction with other active metal, which is helpful to stabilize the active components and improve the redox property.…”

Catalytic behavior and synergistic effect of nanostructured mesoporous CuO-MnOx-CeO2 catalysts for chlorobenzene destruction

“…In the past decades, three types of catalysts, that is, noble metalbased catalysts, transition metal oxide catalysts, and solid acid catalysts [3][4][5], have been studied for the catalytic combustion of CVOCs. Although the noble metal catalysts are catalytically more active at low temperature in comparison with the other metal oxides, the high cost, limited availability, and low resistance to halide such as HCl and Cl 2 , greatly restrict their large-scale application [6,7].…”