Catalytic Oxidation Of Acetone Research Articles

Catalytic Oxidation of Acetone over MnOx-SiO2 Catalysts: An Effective Approach to Valorize Rice Husk Waste.

Rice husk, a byproduct of rice production, poses significant environmental challenges due to disposal issues, while the emission of volatile organic compounds into the atmosphere further exacerbates these concerns. This study addresses both problems by exploring the potential of texturally enhanced SiO2, derived from Uruguayan rice husk, as a catalytic support for manganese oxides in the combustion of volatile organic compounds. SiO2 was synthesized from rice husk ash using a sustainable, acid-free pretreatment method, yielding a notably high silica purity of 96.5%-a level comparable to or exceeding previously reported values, highlighting the high silica quality inherent in Uruguayan rice husk. The catalytic activity was evaluated using acetone as a model volatile organic compound, achieving up to 90% conversion with 30 wt.% manganese oxide at 300 °C, with CO2 as the primary product. Furthermore, a 24 h stability test demonstrated consistent performance, maintaining a conversion rate of around 95.6 ± 2.5%. These findings suggest that high-purity SiO2 derived from Uruguayan rice husk, with its sustainability benefits, offers an effective solution for acetone removal when supporting an active phase such as manganese oxides, addressing both rice husk disposal and volatile organic compound emissions.

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

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 T50 and T100, 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.

Revealing opposite behaviors of catalyst for VOCs Oxidation: Modulating electronic structure of Pt nanoparticles by Mn doping

Revealing opposite behaviors of catalyst for VOCs Oxidation: Modulating electronic structure of Pt nanoparticles by Mn doping

Catalytic oxidation of acetone and ethanol on a platinum wire

The current-voltage characteristics of a thin long platinum wire in air with acetone or ethanol small admixtures were obtained. Using the quadratic dependence of platinum resistance on temperature, the temperature-current dependences for the wire were calculated. At concentrations of combustible gas vapors above a certain value, these dependences show a hysteresis character. Using the assumption of acetone and ethanol complete oxidation on platinum, as a catalyst, and the first order of the oxidation reaction, temperature-current dependences was analysised. The temperature difference between the high and low-temperature stationary regimes of catalytic oxidation on the wire makes it possible to estimate the admixture concentration. As a result, the experimental dependence of the critical current value by catalytic ignition and extinction gas mixture on platinum on the admixture concentration was constructed. With its analytical description, it is possible to fairly accurately estimate the apparent values ​​of the activation energy and the pre-exponential multiplier for the oxidation reaction in a wide temperature range. A method of determining the kinetic parameters for the oxidation reaction based on the experimentally found parameters of degeneracy critical conditions is proposed.

Catalytic oxidation of acetone in air over Ag modified CeO2 catalysts under VUV irradiation: Comparison of different treatment process, performance, and mechanism studies

In this study, the performance of different treatment processes, including UV photolysis, ozonation, UV photolysis + ozonation, and vacuum ultraviolet (VUV) photolysis for oxidation of acetone in the presence and absence of Ag modified CeO 2 photocatalysts was investigated. The as-synthesized catalysts were characterized using XRD, XPS, Raman Spectroscopy, BET, SEM, HRTEM, and EDX techniques. The attained data showed that by introducing Ag nanoparticles into the CeO 2 network, the oxygen storage capability of the catalyst increases, which facilitates the generation of oxygen vacancies leading to the activation of lattice oxygen. The mechanism of the acetone oxidation and the contribution of each participating reaction mechanism were determined. The obtained results indicated that the VUV treatment system shows the best performance among different treatment processes, leading to more than 40% acetone conversion at room temperature. Moreover, the addition of Ag/CeO 2 photocatalysts to the VUV treatment process not only increases the acetone conversion up to 76% but also, by involving the catalytic ozonation as a participating acetone oxidation pathway, can eliminate the generated ozone during the treatment process. The results revealed that adding Ag to CeO 2 photocatalyst under VUV irradiation oxidized the produced CO, significantly improving the reaction selectivity and leading the acetone degradation reactions to total oxidation level of up to 96%. The stability of the Ag/CeO 2 photocatalysts under VUV irradiation was investigated, and an in-situ regeneration process was employed for suppressing the catalyst deactivation process. The durability tests showed more than 73% acetone oxidation even after three consecutive runs and 990 min irradiation. • Different processes, including UV, ozonation, UV + ozonation, and VUV photolysis for oxidation of acetone were investigated. • The acetone oxidation mechanism and contribution of each reaction mechanism were studied. • Simultaneous O 3 decomposition, and CO oxidation during acetone degradation were achieved. • Selectivity of the acetone oxidation reaction toward total oxidation under VUV increased (96%). • An in-situ regeneration method was used for the catalyst stability improvement.

含铝催化剂对丙酮的催化氧化研究进展

含铝催化剂对丙酮的催化氧化研究进展

Catalytic oxidation of acetone over CuCeOx nanofibers prepared by an electrospinning method

A series of CuCeOx nanofiber catalysts with excellent performance toward acetone oxidation were prepared by an electrospinning method.

Simulation of the electrocatalytic oxidation of acetone in a fixed catalyst bed

Catalytic oxidation of acetone on samples of a copper-containing catalyst with an ac electric field applied to the catalyst bed was simulated. The distribution of temperature across the catalyst bed was studied at varied delivered specific electric power, and kinetic parameters of the catalyst samples were determined.