HCl-Tolerant H_xPO₄/RuO_x–CeO₂ Catalysts for Extremely Efficient Catalytic Elimination of Chlorinated VOCs

Abstract

Bulk metal doping and surface phosphate modification were synergically adopted in a rational design to upgrade the CeO2 catalyst, which is highly active but easily deactivated for the catalytic oxidation of chlorinated volatile organic compounds (Cl-VOCs). The metal doping increased the redox ability and defect sites of CeO2, which mostly promoted catalytic activity and inhibited the formation of dechlorinated byproducts but generated polychlorinated byproducts. The subsequent surface modification of the metal-doped CeO2 catalysts with nonmetallic phosphate completely suppressed the formation of polychlorinated byproducts and, more importantly, enhanced the stability of the surface structure by forming a chainmail layer. A highly active, durable, and selective catalyst of phosphate-functionalized RuO x –CeO2 was the most promising among all the metal-doped (Ru, Pd, Pt, Cr, Mn, Fe, Co, and Cu) CeO2 catalysts investigated owing to the prominent chemical stability of RuO x and its superior versatility in the catalytic oxidation of different kinds of Cl-VOCs and other typical pollutants, including dimethyl sulfide, CO, and C3H8. Moreover, the chemical stability of the catalyst, including its bulk and surface structural stability, was investigated by combining intensive treatment with HCl/H2O or HCl with subsequent ex situ ultraviolet–visible light Raman spectroscopy and confirmed the superior resistance to Cl poisoning of the phosphate-functionalized RuO x –CeO2. This work exemplifies a promising strategy for developing ideal catalysts for the removal of Cl-VOCs and provides a catalyst with the superior catalytic performance in Cl-VOC oxidation to date.

Characterization of Ziziphus lotus’ Activated Carbon and Evaluation of Its Adsorption Potential

“…Various wastewater purification and treatment methods with technical, economic, and environmental advantages have been developed and used, such as dry desulfurization of MnOx hydrothermally loaded halloysite desulfurizer [ 8 ], vermifiltration recently identified as one of the best sustainable, natural, and ecofriendly technology for wastewater treatment [ 9 ], elimination of chlorinated VOCs by using HCl-tolerant HxPO 4 /RuOx-CeO 2 catalysts [ 10 ]. Wetlands, considered to be inexpensive and having a wide variety of applications for domestic, agricultural, and industrial waters, can also be used for wastewater treatment [ 11 ], in addition to ozonation, precipitation, coagulation, flocculation, and adsorption.…”

A Facile Method to Synthesize Co3O4 Catalyst for Efficient Chlorobenzene Combustion

“…For example, chlorobenzene (CB) is an important precursor for the formation of polychlorinated dioxins and dibenzofuranes [6] . The efficient degradation of CVOCs has aroused the attention of researchers [7–8] . Catalytic oxidation is considered as one of the most potential methods to treat VOCs because of its characteristics of relatively low energy consumption, less byproducts, high selectivity and low cost [9–11] …”

“…The catalytic oxidation of VOCs relies heavily on catalysts with high activity. So far, the catalysts applied in oxidation of CVOCs are divided into two main categories: (i) noble metals; (ii) transition metal oxides [8,12] . The former has good activity, but is expensive and easy to be deactivated.…”

“…So far, the catalysts applied in oxidation of CVOCs are divided into two main categories: (i) noble metals; (ii) transition metal oxides. [8,12] The former has good activity, but is expensive and easy to be deactivated. And the latter has great potential as a catalyst for CVOCs combustion due to its low cost and good stability.…”

Fabrication of MnCoOx composite oxides for catalytic CO oxidation via a solid-phase synthesis: the significant effect of the manganese precursor

“…With the increasing economic development and population growth, numerous environmental issues, especially atmospheric pollution, have received more and more attention all around the world. [1][2][3][4][5][6][7] As a kind of harmful and lethal gaseous pollutant, carbon monoxide (CO) is widely released from industrial emissions, vehicle exhausts and the imperfect combustion of fossil fuels. [8][9][10][11] Due to its toxic, colorless and odorless properties, even a low concentration of CO represents a significant threat to the physical health of human beings due to its high binding interaction with hemoglobin.…”