Abstract
This study investigated the addition of various oxides to further improve the catalytic characteristics of Tl2O3, which offers a high carbon combustion catalytic capacity to lower the carbon combustion temperature of 660 °C by ~ 300 °C. Mixtures of carbon (2 wt%) with composite catalysts comprising 20 wt% Tl2O3–80wt% added oxide were analyzed using DSC. Bi2O3 offered the best improvement, where the exothermic peak temperatures for carbon combustion of carbon with various Tl2O3–x wt% Bi2O3 composites were lower than that of carbon with pure Tl2O3. Isothermal TG measurements were performed using a mixture of carbon and the Tl2O3‒95 wt% Bi2O3 composite catalyst, where a 2 wt% weight loss (i.e. removal of all carbon) was achieved above 230 °C. A porous alumina filter was coated with the composite catalyst and carbon was deposited on the filter surface. The filter was held at constant temperatures under air flow, which confirmed that carbon was completely removed at 230 °C. This study demonstrated the potential for using these composite catalysts in self-cleaning particulate filters to decompose and eliminate fine particulate matter and diesel particulate matter generated from steelworks, thermal power plants, and diesel vehicles simply using the heat of the exhaust gas in a factory flue-gas stack or vehicle muffler.
Highlights
Carbon-based fine particulate matter with a diameter of less than 2.5 μm (PM2.5) is generated from steelworks and thermal power plants that consume large amounts of coal
These results demonstrated that PM2.5 and diesel particulate matter (DPM) in exhaust gas could potentially be collected and decomposed using porous ceramic filters coated with the low-temperature PM combustion Tl2O3‒Bi2O3 catalytic system proposed in this study
The carbon combustion temperature of 660 °C can be reduced to 300 °C due to the catalytic effect of Tl2O3
Summary
Carbon-based fine particulate matter with a diameter of less than 2.5 μm (PM2.5) is generated from steelworks and thermal power plants that consume large amounts of coal. Research has aimed to develop carbon combustion catalysts to eliminate DPM exhausted from diesel engines at lower temperatures than the current conventional c atalysts[10,11,12,13,14,15,16,17]. Exhaust gas from diesel cars can be controlled via the collection and elimination of DPM using a filter, where an oxidation catalyst is generally used. This technology has been considered for the removal of PM2.5 originating from steelworks and thermal power plants. The collection of PM2.5 and DPM from exhaust gas was explored using porous ceramic filters coated with the catalytic composites for low-temperature carbon combustion. The performance of the self-cleaning type particulate filter for the collection of PM2.5 and DPM was demonstrated experimentally, where the carbon can subsequently be decomposed and removed due to the heat of the exhaust gas
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