Gold-Based Catalysts for Complete Formaldehyde Oxidation: Insights into the Role of Support Composition

Formaldehyde (HCHO) is recognized as one of the most emitted indoor air pollutants with high detrimental effect on human health. Significant research efforts are focused HCHO removal to meet emission regulations in an effective and economically profitable way. For over three decades, unique electronic properties catalytic abilities nano-gold catalysts continue be attractive area for community. Recently, we reported that mechanochemical mixing a relevant approach preparation Co-Ce mixed oxides activity complete benzene oxidation. A trend higher surface defectiveness, particular, oxygen vacancies, caused by close interaction between cobalt oxide cerium phases, was observed composition 70 wt.% Co3O4 30 CeO2. These results directed further improvement promotion gold optimization composition, aiming development efficient catalyst room temperature abatement. Support modification potassium studied; however, K addition less enhancement oxidation than expected. This motivated new carrier material. In Co3O4-CeO2 metal preset ratio, γ-Al2O3 intentionally containing 33% boehmite shortly named Al2O3-b used synthesis. Analysis role support based characterization textural measurements, XRD, HRTEM, XPS, TPR techniques. Gold supported mechanochemically treated Co3O4-CeO2-Al2O3-b (50 Al2O3-b) exhibited superior owing Ce3+ Co3+ amounts abundant species enhanced mobility. achieved CO2 H2O 95% conversion at 100% 40 °C, thus implying potential this developing materials purification.