Catalysts for Low-Temperature Oxidation of Volatile Organic Compounds

摘要

Eltron Research, Inc. is currently developing multi-component metal oxide and supported noble metal catalysts for the destruction of volatile organic compounds (VOCs) in air at low temperatures. The goal for this work is to produce a simple, cost-effective technology for reducing the concentration of VOCs in air to acceptable levels before the air is released into the atmosphere or recirculated. Specific application areas include ventilated work spaces for spray painting and engine maintenance (degreasing and fuel line repair), indoor air decontamination, dry cleaning, food processing (grills and deep fryers), fume hoods, residential use, and solvent-intensive industrial processes. The components of the catalysts were chosen based on their anticipated oxygen surface mobility, resistance to poisoning, multiple oxidation states, and documented activity for oxidation reactions. Catalysts were screened for conversion of 1-butanol and toluene to carbon dioxide and water. The concentrations of VOCs in the feedstream were maintained at ～ 100 ppm, and the space velocity was ～6,000 hr~(-1). Catalysts highlighted in this document generated complete oxidation of 1-butanol to CO2 at 150°C, 69% oxidation at 100°C, and 15% oxidation at 80°C. For toluene, complete oxidation was achieved at 200°C, and greater than 30% oxidation at 150°C. Catalysts deposited onto cordierite monoliths retained there composition and activity, and generally there was an increase in sample surface area and activity with increased catalyst loading.