Abstract
As a kind of toxic gas, carbon monoxide is often found in industrial waste gas, automobile exhaust, confined space such as submarines, etc. In recent years, the purification of carbon monoxide has attracted more and more attention. Catalytic oxidation has become a widely used method for carbon monoxide purification. In this paper, manganese oxide nanoparticles were synthesized by emulsion self-assembly method and characterized by X-ray powder diffraction (PXRD) and high-resolution transmission electron microscope (HRTEM). The activity of the oxide nanoparticle catalysts were evaluated on the fixed bed tubular quartz microreactor at atmospheric pressure. The effects of KMnO4 dosage, flow rate and temperature were investigated and the reaction kinetics range was determined.
Highlights
Carbon monoxide (CO) is a typical flammable and toxic compound
This paper mainly studies the catalytic performance of manganese oxide nanoparticles for CO oxidation
The gas distribution part is composed of four gas cylinders and a gas distribution box, which is mainly used for flow control and gas mixing
Summary
The toxic characteristics of CO are colorless, tasteless and odorless, which makes it difficult to detect its existence. Catalytic oxidation is a widely used method for CO purification among which non-noble metal catalysts have made great progress in CO purification due to their abundant resources and low price [2]. Non-noble metal catalysts generally require high reaction temperature [3]. In order to improve the conversion efficiency at low temperature, non-noble metal catalysts with smaller particle size have been studied. The experiments showed that the oxidation activity of nano-sized catalysts with good dispersion and large specific surface area was much higher than that of conventional types [4], but the catalytic activity of nano-sized manganese oxide for CO was not well understood. This paper mainly studies the catalytic performance of manganese oxide nanoparticles for CO oxidation. The effects of flow rate and temperature on CO conversion rate were investigated in a micro fixed-bed reactor by using the method of dynamic tube experiment, so as to screen out the optimal conditions for CO catalysis by MnOx nanoparticles
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