Platinum Nanoparticles Supported on Hierarchically Porous Aluminosilicate Nanospheres for Low-Temperature Catalytic Combustion of Volatile Organic Compounds

Abstract

The hierarchically porous silica (NKM-5) and aluminosilicate (Al-NKM-5) supported platinum nanoparticles catalysts were prepared and investigated for the catalytic combustion of toluene and ethanol. The Pt/NKM-5 and Pt/Al-NKM-5 catalysts displayed the submicrometer spherical morphology and the hierarchical pore structure, and the Pt nanoparticles were uniformly distributed. The Pt/NKM-5 and Pt/Al-NKM-5 showed excellent low-temperature catalytic activity and CO2 selectivity, and the hierarchical pores were beneficial to the catalytic combustion of toluene. With the increase of Al content, the catalytic activity of Pt/Al-NKM-5 increased gradually; the Pt/Al-NKM-5-5 catalyst with Si/Al = 5 showed the most excellent catalytic activity with 90% toluene conversion at 146 °C and 90% ethanol conversion at 138 °C. The NMR and NH3-TPD showed that the incorporation of Al could increase the acidity of support, which could promote the distribution of Pt and the adsorption of toluene as characterized by UV–vis, TEM, CO pulse chemisorption, and FTIR. The excellent catalytic activity of Pt/Al-NKM-5-5 could be ascribed to the hierarchically porous structure, more acidic sites, and higher Pt dispersity.

Regulating the Spatial Distribution of Ru Nanoparticles on CeO2 Support for Enhanced Propane Oxidation

“…The emission of volatile organic compounds (VOCs) is known to cause ozone layer depletion and photochemical smog formation . Catalytic combustion is considered to be one of the most effective strategies because it is highly adaptable to a broad range of VOC gas concentrations, free of secondary pollution, and able to be run at mild reaction temperatures. − Light alkanes (C2–C4) contribute a large fraction of the VOC emissions, particularly ethane and propane, which make up 3.9 and 2.6% of the total VOC emissions, respectively . However, these short-carbon-chain molecules are thermodynamically and chemically stable, making them difficult to catalytically convert. ,− With the increase of interest in using propane as a fuel in the transportation sector, it is critical to design a robust and economical catalyst that can operate at mild temperatures to control light-alkane oxidation.…”

Challenges and opportunities for zeolite-based catalysts in catalytic oxidation of volatile organic compounds

“…nanosheets) or introducing hierarchical porosity to enhance catalytic performances in the oxidation of VOCs. [27][28][29][30][31][32][33][34][35][36][37][38] 2.2.1. Morphology adjustment of zeolites.…”

“…nanosheets) or introducing hierarchical porosity to enhance catalytic performances in the oxidation of VOCs. 27–38…”

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. − …”