Catalytic combustion of trichloroethylene over TiO2-SiO2 supported catalysts

Catalytic Destruction of Dichloromethane Using Perovskite-Type Oxide Catalysts

“…Otherwise, CO may adsorb on surface oxide ions, leading to a labile species that interacts with adsorbed atomic O 2 that then decomposes to afford adsorbed CO 2 and O 2 molecular O 2 Ϫ species. This result is observed in accordance with the results obtained by Kułaźyñski et al 35 and Kie␤ling et al 36…”

Combustion of chlorinated volatile organic compounds (VOCs) using bimetallic chromium-copper supported on modified H-ZSM-5 catalyst

“…In order to study their suitability to act as the catalyst support in the combustion of chlorinated VOC, the chemical resistance of the modified and unmodified ZSM-5 support against hydrogen chloride was demonstrated using the method proposed by Kulażyński et al [25]. First, the support material was heated in the reactor at 400 • C, while an air flow at 50 ml/min was passed through the reactor for 4 h. This air stream was previously passed through a saturator containing concentrated HCl.…”

“…In the combustion of Cl-VOC, the occurrence of hydrogen chloride as the desired chlorine-containing product in the outlet stream gas can pose significant problems to some combustion catalysts [13,25]. In the present study, the chemical resistance of the SiCl 4 -Z support and H-Z as the reference (control) against hydrogen chloride is tested using gaseous hydrogen chloride at 400 • C for 4 h. Changes in the surface characteristics, acidity and crystallinity of these support materials could provide useful information on their nature and degree of deactivation in the combustion of Cl-VOC.…”

“…The justification is based on the fact that catalysts deactivation associated with the support during the combustion of Cl-VOC is primarily due to their intolerance to hydrogen chloride [7,11,25]. Thus, the deactivation of the SiCl 4 -Z-supported bimetallic catalyst in the process should be mostly ascribed to chemical and physical changes occurring in the metal species, rather than those of the catalyst support.…”

“…In fact, the H/C ratio of the Cl-VOC is the key factor that determined the life of a combustion catalyst [25]. In a similar way, the initial slower activity decay with TCE compared to that caused by TCM can be attributed to the lower reactivity of the former substance.…”