Catalytic Oxidation of Acetone on SmMn₂O₅: Effect of Acid Etching and Loading Treatment

Abstract

The key of catalytic oxidation technology is to develop a stable catalyst with high activity. It is still a serious challenge to achieve high conversion efficiency of acetone with an integral catalyst at low temperature. In this study, the SmMn2O5 catalyst after acid etching was used as the support, and the manganese mullite composite catalyst was prepared by loading Ag and CeO2 nanoparticles on its surface. By means of SEM, TEM, XRD, N2-BET, XPS, EPR, H2-TPR, O2-TPD, NH3-TPD, DRIFT, and other characterization methods, the related factors and mechanism analysis of acetone degradation activity of the composite catalyst were discussed. Among them, the CeO2-SmMn2O5-H catalyst has the best catalytic activity at 123 and 185 °C for T 50 and T 100, respectively, and shows excellent water and thermal resistance and stability. In essence, the surface and lattice defects of highly exposed Mn sites were formed by acid etching, and the dispersibility of Ag and CeO2 nanoparticles was optimized. Highly dispersed Ag and CeO2 nanoparticles have a highly synergistic effect with the support SmMn2O5, and the reactive oxygen species provided by CeO2 and the electron transfer brought by Ag further promote the decomposition of acetone on the carrier SMO-H. In the field of catalytic degradation of acetone, a new catalyst modification method of high-quality active noble metals and transition metal oxides supported by acid-etched SmMn2O5 has been developed.

Maillard Reaction Inspired Microexplosion toward Fast Synthesis of Two-Dimensional Mesoporous Tin Oxides for Efficient Chemiresistive Gas Sensing

“…The characteristic peaks at 1679 and 2352 cm –1 are also observed, consistent with the absorption of H 2 O and CO 2 . Therefore, acetone molecules can first be adsorbed on the surface of Pd/mSnO 2 -0.5 and then quickly be oxidized to intermediates (acetic acid and formic acid), following a complete oxidation process toward H 2 O and CO 2 . , These reaction processes are described in eqs –. normalO 2 ( gas ) → normalO 2 ( ads ) normalO 2 false( ads false) + normale − → normalO 2 − ( ads ) normalO 2 − ( ads ) + normale − → 2 normalO − ( ads ) normalC normalH 3 normalC normalO normalC normalH 3 + 3 normalO − ( ads ) → normalC normalH 3 normalC normalO normalO normalH + normalH normalC normalO normalO normalH + 3…”

“…The characteristic peaks at 1679 and 2352 cm –1 are also observed, consistent with the absorption of H 2 O and CO 2 . Therefore, acetone molecules can first be adsorbed on the surface of Pd/mSnO 2 -0.5 and then quickly be oxidized to intermediates (acetic acid and formic acid), following a complete oxidation process toward H 2 O and CO 2 . , These reaction processes are described in eqs –. …”

Unravelling High Water Vapor-Induced Inhibitory Effects on Pt/Co3O4 Catalysts toward Benzene Oxidation

“…25 In addition, a wide range peak at 150−300 °C indeed can be deconvoluted to two peaks, with the former derived from the reduction of Co 3+ to Co 2+ and the latter corresponding to the reduction of Co 2+ to Co 0 . 26 The O 2 -TPD curves were used to analyze the distribution of different oxygen species, as presented in Figure 4b, where the pronounced peak around 100 °C belongs to the desorption of physical-adsorbed oxygen, 39 this is caused by rich mesoporous structure in the catalysts filled with oxygen from the atmosphere. However, a wider peak positioning at 200−400 °C corresponds to the desorption of surface chemical-adsorbed oxygen species, 25,40 namely, the O ads analyzed in XPS O 1s spectra (Figure 3c).…”

Ultrathin LayCoOx Nanosheets with High Porosity Featuring Boosted Catalytic Oxidation of Benzene: Mechanism Elucidation via an Experiment–Theory Combined Paradigm

“…Moreover, benzene is considered a precursor to severe environmental issues, including photochemical smog and haze. , Given its substantial impact on both environmental quality and human health, there is an urgent need for reliable technologies to effectively remove benzene. , Among the various technologies available, thermal catalytic oxidation stands out as one of the most promising methods for the removal of benzene removal. It offers advantages such as high efficiency, relatively low energy consumption, versatility, and durability. − …”