Optimized Synthesis Routes of MnOx-ZrO2 Hybrid Catalysts for Improved Toluene Combustion

• Published in: Catalysts Vol. 11; no. 9; p. 1037
• Main Authors: Huang, Xin, Li, Luming, Liu, Rong, Li, Hongmei, Lan, Li, Zhou, Weiqi
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.09.2021
• Subjects: active oxygen; Adsorption; Ball milling; Bimetals; Catalysts; Catalytic activity; Catalytic oxidation; Chemical reactions; Chemical synthesis; Combustion; Grain size; Lattice vacancies; Membrane separation; Metal oxides; Mn-Zr solid solution; Oxidation; Oxygen; Pore size; Solid solutions; Thermal stability; Toluene; Zirconium dioxide
• ISSN: 2073-4344; 2073-4344
• DOI: 10.3390/catal11091037

In this contribution, the three Mn-Zr catalysts with MnxZr1−xO2 hybrid phase were synthesized by two-step precipitation route (TP), conventional coprecipitation method (CP) and ball milling process (MP). The components, textural and redox properties of the Mn-Zr hybrid catalysts were studied via XRD, BET, XPS, HR-TEM, H2-TPR. Regarding the variation of synthesis routes, the TP and CP routes offer a more obvious advantage in the adjustment of the concentration of MnxZr1−xO2 solid solution compared to the MP process, which directly commands the content of Mn4+ and oxygen vacancy and lattice oxygen, and thereby leads to the enhanced mobility of reactive oxygen species and catalytic activity for toluene combustion. Moreover, the TP-Mn2Zr3 catalyst with the enriched exposure content of 51.4% for the defective (111) lattice plane of MnxZr1−xO2 exhibited higher catalytic activity and thermal stability for toluene oxidation than that of the CP-Mn2Zr3 sample with a value of 49.3%. This new observation will provide a new perspective on the design of bimetal catalysts with a higher VOCs combustion abatement.