Catalytic destruction of chlorobenzene over K-OMS-2: Inhibition of high toxic byproducts via phosphate modification

Industrial Chlorinated Organic Removal with Elimination of Secondary Pollution: A Perspective

“…The primary disadvantage of present CVOC combustion is the defects of stability or durability of the catalyst. Some of the most effective catalysts designed for hydrocarbon combustion processes, such as transition metal oxides (Mn, Cu), noble metal catalysts (Pt, Pd), and zeolite catalysts (HZSM-5, SBA-15), cannot be directly diverted to the treatment of CVOCs. , Figure A shows that the sensitivity of transition metal oxides to the dissociated chlorine atoms causes the active phase of common catalysts to change into chlorides (MnCl x , and CuCl x , ) in a relatively short time, resulting in a loss of oxidation performance. This is because the first adsorption of C–Cl always occurs on the metal–O, which leads to the formation of metal–Cl from metal–O on the catalyst surface (As exhibited in Figure A, right).…”

“…This is because the first adsorption of C–Cl always occurs on the metal–O, which leads to the formation of metal–Cl from metal–O on the catalyst surface (As exhibited in Figure A, right). And the next step will no doubt cause the formation of polychlorinated byproducts and dioxins during contact with reaction intermediates or target contaminant by utilizing this metal–Cl as a powerful catalyst. , Some studies also reported that 17 different types of dioxins were detected on Mn-, V-, Ru-, and Ce-based catalysts caused by the corresponding metal–Cl as a catalyst, although the levels are extremely low. , For general noble metals (such as Pt and Pd) exhibiting high activity toward common hydrocarbons, the formation of metal–Cl by the intense attack of dissociated chlorine also results in the deactivation of the catalyst and the formation of polychlorinated byproducts during the combustion of CVOCs . Besides, the easy volatilization of the platinum chloride or palladium chloride will also result in the loss of active components in the reaction process .…”

“…(A, right) Poisoning process of MnO x active during combustion of chlorobenzene. Reproduced with permission from ref . Copyright 2023 Elsevier.…”

“…13,25 Some studies also reported that 17 different types of dioxins were detected on Mn-, V-, Ru-, and Ce-based catalysts caused by the corresponding metal−Cl as a catalyst, although the levels are extremely low. 13,19 For general noble metals (such as Pt and Pd) exhibiting high activity toward common hydrocarbons, the formation of metal−Cl by the intense attack of dissociated chlorine also results in the deactivation of the catalyst and the formation of polychlorinated byproducts during the combustion of CVOCs. 12 Besides, the easy volatilization of the platinum chloride or palladium chloride will also result in the loss of active components in the reaction process.…”

Estimate of the C−Cl photoionization cross section and absolute photoionization cross sections of chlorinated organic compounds

“…[5,6] The treatment and removal of these chlorinated contaminants proves difficult: catalytic destruction of CVOCs can result in a chlorine-poisoned catalyst and polychlorinated byproducts with higher acute toxicity levels. [7] Analysis of tropospheric reactions that transform CVOC pollution requires quantification of organochlorine compounds. Photoionization mass spectrometry is one method for quantitative investigation of elementary chemical kinetics.…”