Abstract
Carbon monoxide (CO) is a very toxic pollutant emitted from wood fired boiler, which is widely used in small and medium enterprises in Vietnam. The treatment of CO containing flue gas faces many difficulties due to the inert property of CO and cannot be removed by traditional adsorption and absorption methods and one of the effective CO treatments is catalytic oxidation. Therefore, we aimed to prepare various catalysts on different carriers for treatment of CO in flue gas, including γ-Al2O3-based metal oxides (Co3O4/Al2O3, Cr2O3/Al2O3, and CuO/Al2O3), CuO–MnOx/OMS-2, and CuO-MnOx/zeolite. The CO removal tests were conducted in a continuous fixed bed reactor in laboratory scale with temperature range of 50 – 550 oC. The characteristics of catalytic materials were then determined by various methods such as Brunauer-Emmett-Teller measurement, X-ray diffraction, energy-dispersive X-ray spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis. Results showed that CuO-MnOx/OMS-2 was the best catalyst with high removal efficiency of 98.41% at reactor temperature of 250 oC while gas outlet temperature of < 50 oC, proving the suitability of this material for practical treatment of CO in flue gas. The reaction follows Mars-Van-Krevelen mechanism with the presence of Cu2+-O2--Mn4+ ↔ Cu+-o-Mn3+ + O2 redox in the structure of the material. Moreover, the effect of environmental factors such as flow rate, inlet CO concentration, and catalysts amount on the CO removal efficiency were investigated and noted for designing and operation purposes. Concentration of outlet CO met well QCVN 19: 2009/BTNMT - National technical regulation on industrial emissions for dust and inorganic substances. Therefore, CuO-MnOx/OMS-2 catalyst material could be a potential catalyst for treatment of CO in flue gas of boiler.
Highlights
Every year, millions of tons of carbon monoxide (CO) emitted into the environment cause serious consequences for human health 1
The results proved that CuO-MnOx/octahedral molecular sieves (OMS)-2 materials was effective for CO removal and stable over time
Catalysts of Co3O4/Al2O3, Cr2O3/Al2O3, CuO/Al2O3, CuO-MnOx/OMS-2, and CuOMnOx/zeolite were synthesized by impregnation and hydrothermal methods and applied for oxidation of carbon monoxide gas in air
Summary
Millions of tons of carbon monoxide (CO) emitted into the environment cause serious consequences for human health 1. In addition to natural emission sources, carbon monoxide (CO) is generated by incomplete combustion of carboncontaining substances in wood-fired boilers, waste incinerators and other processes. Due to the limited budget and low technology, most of the wood boilers are cheap and inefficient and the incomplete combustion results in high concentration of CO in the flue gas. Noble metal containing catalysts such as Au/TiO2, Au/ZrO2 and Pt/SnO2 have been used for low temperature CO oxidation. Studies show that the catalytic activity of CuO depends on the oxidation state of Cu and especially on the nature of the carrier. There have not been many studies focusing on the treatment of CO in the waste biomass boiler (which has a temperature of about 250 ◦C) using catalysts that do not contain nobles metals
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