Regulating the Pt–MnO₂ Interaction and Interface for Room Temperature Formaldehyde Oxidation

Abstract

Formaldehyde (HCHO) is a hazardous pollutant in indoor space for humans because of its carcinogenicity. Removing the pollutant by MnO2-based catalysts is of great interest because of their high oxidation performance at room temperature. In this work, we regulate the Pt–MnO2 (MnO2 = manganese oxide) interaction and interface by embedding Pt in MnO2 (Pt-in-MnO2) and by dispersing Pt on MnO2 (Pt-on-MnO2) for HCHO oxidation over Pt–MnO2 catalysts with trace Pt loading of 0.01 wt %. In comparison to the Pt-in-MnO2 catalyst, the Pt-on-MnO2 catalyst has a higher Brunauer–Emmett–Teller surface area, a more active lattice oxygen, more oxygen vacancy activating more dioxygen molecules, more exposed Pt atoms, and noninternal diffusion of mass transfer, which contribute to the higher HCHO oxidation performance. The HCHO oxidation performance is stable over the Pt–MnO2 catalysts under high space velocity and high moisture humidity conditions, showing great potential for practical applications. This work demonstrates a more effective Pt-dispersed MnO2 catalyst than Pt-embedded MnO2 catalyst for HCHO oxidation, providing universally important guidance for metal–support interaction and interface regulation for oxidation reactions.

Au Nanoparticle/MgAl2O4 Catalysts via Acid Etching for Formaldehyde Oxidation

“…21-1152) . In addition, nitric acid treatment did not induce any changes in the crystalline phase of the MgAl 2 O 4 support, and after Au loading, there were no peaks attributable to Au particles observed, indicating that the Au species distribution is uniform and well-dispersed …”

Photothermal Methane Dry Reforming Catalyzed by Multifunctional (Ni–Cu/CeO2)@SiO2 Catalyst

“…The result (Figure C) shows the biggest arc radii for the Ni@SiO 2 catalyst, followed by the (Ni/CeO 2 )@SiO 2 and (Ni-Cu/CeO 2 )@SiO 2 catalysts, indicating the continuous decrease of charge-transfer resistance by adding CeO 2 and Cu. This could contribute to the enhanced electronic interaction between Ni or NiCu and CeO 2 , promoting the separation and transfer of photocarriers . The PL spectra of the catalysts detect signals of 372 and 397 nm in (Ni/CeO 2 )@SiO 2 and (Ni-Cu/CeO 2 )@SiO 2 but only detect a signal of 397 nm in Ni@SiO 2 within the wavelength 300–440 nm (Figure D).…”

“…This could contribute to the enhanced electronic interaction between Ni or NiCu and CeO 2 , promoting the separation and transfer of photocarriers. 36 The PL spectra of the catalysts detect signals of 372 and 397 nm in (Ni/CeO 2 )@SiO 2 and (Ni-Cu/CeO 2 )@SiO 2 but only detect a signal of 397 nm in Ni@SiO 2 within the wavelength 300−440 nm (Figure 6D). The signal at 372 nm is from the electron hopping in CeO 2 , and the signal at 397 nm is from Ni.…”

Ag-promoted Cr/MnO2 catalyst for catalytic oxidation of low-concentration formaldehyde at room temperature

“…In contrast to other methods, catalytic oxidation technology can efficiently remove indoor formaldehyde without secondary pollution and has become one of the most potential indoor formaldehyde removal methods. 5 To date, the catalytic materials for removing formaldehyde can be divided into noble metal [6][7][8] and transition metal oxide [9][10][11] systems. Between them, transition metal oxide catalysts have been extensively studied because of their low price and abundant sources.…”

“…To date, the catalytic materials for removing formaldehyde can be divided into noble metal 6–8 and transition metal oxide 9–11 systems. Between them, transition metal oxide catalysts have been extensively studied because of their low price and abundant sources.…”