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Catalytic Oxidation - Europe PMC

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Last Updated: 03 October 2022

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Highly efficient and low pollution catalytic oxidation of ramie degumming by NHPI

A new ramie degumming technique, N-Hydroxyphthalimide catalytic degumming device, was introduced to solve the environmental contamination issues as well as the energy consumption issues of the traditional alkaline degumming process and the 2,2,6,6-oxyl oxidation degumming method. The effect of parameters on the characterization of ramie fibers degummed by NCODM was investigated in this paper. By comparing with the different degumming techniques using the central composite design method, the degumming procedure was optimized. Then, the degumming process was improved. Then, the degumming process was improved by comparing with the various degumming techniques using the central composite design method. Furthermore, the chemical oxygen demand value of the wastewater from NCODM was 31 percent and 3% lower than that of TADM and TODM, respectively.

Source link: https://europepmc.org/article/MED/IND607798443


Insights into Chlorobenzene Catalytic Oxidation over Noble Metal Loading {001}-TiO 2 : The Role of NaBH 4 and Subnanometer Ru Undergoing Stable Ru 0 ↔ Ru 4+ Circulation.

In the 1000-min on-stream test, Rust, Pd, and Rh were loaded on 001-TiO 2 for thermal catalytic oxidation of chlorobenzene, with Ru/001-TiO 2 demonstrating superior reactivity, CO 2 selectivity, and stability. Interestingly, both acid sites and reactive oxygen species were remarkably enhanced by adding NaBH 4. Continuous deep oxidation of CB with effective Cl desorption is also a key problem successfully addressed by the persistent Ru 0 u2194Ru 4+ circulation, with continuous deep oxidation of CB with quick Cl desorption. This circulation was facilitated by the higher subnanometer Ru dispersion on 001-TiO 2 than the other two noble metals that were not supported by single atom stability DFT calculations, according to this analysis. Nearly 88 degradation products in off-gas were found, with Ru/001-TiO 2 delivering the lowest polychlorinated benzene byproducts. According to the collaboration of NaBH 4's enhanced active locations and Ru circulation, an effective and cost-effective CB degradation mechanism was developed.

Source link: https://europepmc.org/article/MED/36168671


Biomimetic Tremelliform Ultrathin MnO 2 /CuO Nanosheets on Kaolinite Driving Superior Catalytic Oxidation: An Example of CO.

Kaolinite flakes were uniformly wrapped in ultrathin tremelliform MnO 2 nanosheets with thicknesses of about 1. 0 to 1. 5 nm. In kaolinite, the Si-O and Al-O groups developed a robust composite structure by using MnO 2 nanosheets. Even after calcination above 350 °C, the ultrathin MnO 2 lamellar system maintained good stability even after calcination above 350 °C. Following CO oxidation, open channels ensured swift transportation and migration of CO and O 2 during CO oxidation. At a relatively low temperature, the synthesized KM@CuO-NO3 achieved a 90% CO conversion rate at a minimal temperature. In addition, the abundant oxygen vacancies on KM@CuO-NO 3 supported the absorption and activation of oxygen species, which in turn enhanced the oxygen mobility and reactivity in the catalytic process. CuO delivered to the catalyst not only increased the Mn-O bond but also weakened the Mn-O bond, which in turn increased the oxygen species's mobilities, contributing to the oxygen species's high demand for CO oxidation.

Source link: https://europepmc.org/article/MED/36150181


Identifying Metal-Oxo/Peroxo Intermediates in Catalytic Water Oxidation by In Situ Electrochemical Mass Spectrometry.

Water oxidation's mechanism has been increasingly investigated by molecular oxidation synthesis, but its mechanism is still unclear. These experimental findings established the water nucleophilic attack mechanism for the single-site water oxidation catalysis, which were further supported by experimental results. This work also showed that such an in situ EC-MS system is a useful analytical instrument for redox catalytic reactions rather than limited to water oxidation.

Source link: https://europepmc.org/article/MED/36149317


Inexpensive and easily replicable precipitation of CuO nanoparticles for low temperature carbon monoxide and toluene catalytic oxidation.

CuO NPs was also tested as a catalyst for carbon monoxide and toluene conversion, which was more important. CuO NPs are well-covered by grains size, exhibiting homogeneous morphology made of extremely fine interconnected particles with an apparent porosity, as shown by SEM photographs. u223c2. 65 eV is the lowest error value obtained from optical property measurements, which is approximately 270-c2. 65 eV. CuO NPs' catalytic results can be attributed to a variety of factors including crystal structure, morphology, surface oxygen mobility, redox property, and the greater specific surface area. According to more detailed XPS and H 2 -TPR results, the conversion of CO and C 7 H 8 over CuO NPs occurred using a Mars-van Krevelen type device. In the long-isothermal test, CuO NPs catalysts is reusable and showed good stability. CuO NPs has been identified as a cost-effective and cheap catalyst for CO and C 7 H 8 conversion at low temperatures.

Source link: https://europepmc.org/article/MED/36164522


Controlling the Fe 2 O 3 -SiO 2 interaction: The effect on the H 2 S selective catalytic oxidation and catalyst deactivation.

Biogas utilization is one of the most viable options for lowering the consumption of fossil fuels for energy production, according to the presence of H2 S as a significant industrial and environmental issue. Two different synthesis techniques were used to synthesize iron oxide support on silica catalysts with metal loadings ranging from 0. 5 to ten percentwt. The catalysts were tested for selective oxidation of H 2 S, affecting operating conditions such as O 2 /H 2 S, temperature, and water content. According to a lower sintering, higher production, and selectivity, lower deactivation rates, and lower sensitivity to the operating environment, sol-gel catalysts showed the highest metal-oxide/support interaction, reducing the metal-oxide nanoparticles sintering rate and reduced the lower sensitivity to the operating conditions. Based on the test and characterization results obtained, a catalytic cycle containing the potential surface intermediate states of the catalyst is suggested.

Source link: https://europepmc.org/article/MED/36126690


N,P-co-doped carbocatalyst from olive pomace obtained by catalytic hydrothermal carbonization for efficient dye degradation via persulfate-based advanced oxidation process

However, studies on the effect of doping phosphorus atoms on degradation results are still limited. With a minimum turnover rate of 0. 275 min -1 and an excellent turnover rate of 0. 275 min -1, N,P-HC, with its large surface area, high N-pyridine and N-pyrrolic content, and the presence of P-O-C and O-P-C bonds, provides high degradation performance, 98% degradation of Rhodamine B in 40 min, according to the experimental results. The non-radical pathway in RhB degradation was determined by the quenching study, which revealed that singlet oxygen production and direct electron transfer were the key reaction pathways for the non-radical pathway. Overall, this report demonstrated a simple and safe way for synthesizing a high-performance N,P co-doped olive pomace-based carbocatalyst for water depolution in the presence of PDS.

Source link: https://europepmc.org/article/PPR/PPR546305


Non-thermal plasma synthesis of supported Cu-Mn-Ce mixed oxide catalyst towards highly improved catalytic performance for volatile organic compound oxidation.

The supported mixed oxide catalyst's catalytic activity of the supported mixed oxide catalyst was dramatically reduced in comparison to that of the transition metal mixed oxide pellet catalyst, although it was not available in industrial use. Consequently, CMC/SiO 2 -P demonstrated much greater catalytic capacity than CMC/SiO 2 prepared by the incipient wetness impregnation process for the catalytic oxidation of toluene and n-hexane. The 15%CMC/SiO 2 -P catalyst also had a high catalytic activity comparable to that of the bolstered noble metal catalyst for the inert hexane oxidation.

Source link: https://europepmc.org/article/MED/36104644


Nanosheet-state cobalt-manganese oxide with multifarious active regions derived from oxidation-etching of metal organic framework precursor for catalytic combustion of toluene.

For the first time, a nanosheet-state CoMnx mixed oxide with multifarious active regions was synthesized by an oxidation-etching assembly of metal organic framework precursors and used for catalytic combustion of toluene at low temperatures. On the MnCo 2 O 4. 5 plane, which is helpful to toluene oxidation and accelerated adsorption energy, gaseous oxygen with the longer bond length and higher adsorption energy was found to be adsorbed and activated well, according to Density's functional theory results, which is favored for the toluene oxidation. The contribution of different active regions and oxidation mechanism for the CoMnx catalyst was determined by an infrared spectroscopy technique. Besides VOC combustion catalysts, the present simple method of oxidation-etching assembly of the MOF precursor for the manufacture of novel catalyst with high success could be used in a variety of materials other than VOC combustion catalysts.

Source link: https://europepmc.org/article/MED/36099840

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions

* Please keep in mind that all text is summarized by machine, we do not bear any responsibility, and you should always check original source before taking any actions