Highly Efficient Oxidation of Propane at Low Temperature over a Pt-Based Catalyst by Optimization Support

Abstract

Pt-based catalysts have attracted widespread attention in environmental protection applications, especially in the catalytic destruction of light alkane pollutants. However, developing a satisfying platinum catalyst with high activity, excellent waterresistance, and practical suitability for hydrocarbon combustion at low temperature is challenging. In this study, the Pt catalyst supported on the selected Nb 2 O 5 oxide exhibited an efficient catalytic activity in propane oxidation and exceeded that of most catalysts reported in the literature. More importantly, the Pt/Nb 2 O 5 catalyst maintained excellent activity and durability even after high-temperature aging at 700 °C and under harsh working conditions, such as a certain degree of moisture, high space velocity, and composite pollutants. The excellent performance of the Pt/Nb 2 O 5 catalyst was attributed to the abundant metallic Pt species stabilized on the surface of Nb 2 O 5 , which prompted the C−H bond dissociation ability as the rate-determining step. Furthermore, propane was initially activated via oxidehydrogenation and followed the acrylate species path as a more efficient propane oxidation path on the Pt/Nb 2 O 5 surface. Overall, Pt/Nb 2 O 5 can be considered a promising catalyst for the catalytic oxidation of alkanes from industrial sources and could provide inspiration for designing superb catalysts for the oxidation of light alkanes.

Crystal Engineering of TiO2 for Enhanced Catalytic Oxidation of 1,2-Dichloroethane on a Pt/TiO2 Catalyst

“…Therefore, the redox performances of the catalyst and the supports were first studied by H 2 -TPR spectra (Figures a and S11). For the Pt/TiO 2 -R catalyst, a strong reduction peak was observed at 40 °C, which was ascribed to the reduction of Pt 2+ and Pt 4+ species (XPS results). , Furthermore, the hydrogen consumption of this reduction peak (80 μmol/g) was larger than the theoretical hydrogen consumption of Pt species (71 μmol/g) calculated based on XPS results (Table S3), indicating the coreduction of the TiO 2 support, which may be caused by the film structure of Pt species on the surface of the TiO 2 support. The reduction peak at a high temperature of 250–450 °C for the Pt/TiO 2 -R catalyst corresponded to the reduction of surface oxygen of the TiO 2 support .…”

Enhanced Fischer–Tropsch synthesis performance on MOFs‐derived Fe‐based catalysts constrained by SiO2

“…[25] Metal-organic frameworks (MOFs), a complex porous nanomaterial, are considered to be a promising new porous material because of their tunable framework structure, diverse crystal types, large specific surface area, and high porosity. [26][27][28][29][30] However, defects such as poor thermal stability and easy hydrolysis limit the development of MOFs in catalytic field. [31,32] In recent years, carbon-based materials obtained by pyrolysis of MOFs as templates have received much attention.…”

Study of photodegradation performance of Zn‐doped CeO2 nanoparticles for wastewater contaminants remediation under visible light

“…In addition, the toxicity of these pigments can endanger the life of aquatic animals and also pollute groundwater by accumulating in the soil. According to estimations, 10% to 15% of dyes enter the environment as effluents in the course of dyeing and polishing processes, which signifies the necessity of their removal 14–17 . There are many methods for removing paint from paint‐containing effluents including adsorption, coagulation, flocculation, membrane purification, ion exchange, and photocatalytic adsorption of chemical oxidation (chlorination, ozone use, ultrafiltration, reverse osmosis, etc.…”

“…Although chlorination is widely exerted in disinfection processes, however, the by‐products (using chlorination method) are carcinogenic and mutagenic to humans. Next to their different reaction systems, all of the heterogeneous processes are described with the same chemical properties among the advanced oxidation procedures, which is the usage of photocatalytic compounds (such as CdS, Fe 2 O 3 , ZnO, and TiO 2 ) 15 . Photocatalysts are semiconductor materials that can be activated by being exposed to radiation with a specific energy and induce the occurrence of oxidation and reduction reactions by producing oxidizing and reducing species 22 .…”