Abstract
Most studies on honeycomb catalysts have been conducted using simulation models and exhaust experiments from automobiles. Very few monolithic catalyst studies have been applied to the agricultural sector, especially the catalyst exhaust system for flue purification from the biomass industry. The importance of exhaust gas purification and particulate removal from biomass power plants has become critical for evaluating the performance and environmental sustainability of biomass combustion. This is one of the first studies to investigate the performance of honeycomb catalysts for the oxidation of flue (PM2.5), (CO), and (SO2) from a rice husk briquette combustion system. The experimental setup comprised a fixed-bed electric furnace, the catalyst, an aerosol sampler, and a flue gas analyzer. Rice husk (0.1 g/mL density) and rice husk briquettes (0.8 g/mL density), were burned at 600–1000 °C for 3 min. From the results, the catalyst CO conversion rate was 100% at the optimum heated temperatures of 427.4–490.3 °C. At these temperatures, the inhibition effect of the chemisorbed CO was significantly minimized, enhancing the adsorption of oxygen, which reacted with CO to form CO2. However, SO2 oxidation was lower than that of CO because platinum-based catalysts are generally more attracted to CO in the presence of oxygen. The emission of PM2.5 decreased from its uncatalyzed-value (1169.9 mg/m3 and 1572.2 mg/m3) to its catalyzed values (18.9 mg/m3 and 170.1 mg/m3). This is a significant result in ensuring cleaner production of energy from rice husk.
Highlights
Biomass energy is the oldest energy source for humans
The particulate matter and gaseous emissions such as carbon monoxide (CO), nitrogenous oxide (NOx), and sulfur dioxide (SOx), from these systems are significant and there is less infrastructural investment compared to direct combustion
Studies on metallic honeycomb catalysts have been used to reduce emissions from vehicles in the automobile industry [21,24] and very few studies have investigated the performance of a metallic honeycomb catalyst on particulate matter (PM), CO, and SO2 emission reduction from biomass combustion systems such as rice husks
Summary
Biomass energy is the oldest energy source for humans. Bioenergy is a key factor in a low-carbon future, and its demand is projected to increase significantly, accounting for 17% of global energy by 2060 [1]. The environmental advantage of biomass utilization compared to fossil fuels, can only be competitive and preferred because of its low emissions Biomass, such as rice husk, has been used as an auxiliary to study the combustion behavior of sewage sludge biomass [15]. The ability of a chemical catalyst to reduce the temperature required for the complete combustion of biomass, such as rice husk, is important for amorphous silica production with a porous structure, high surface area, increased densification, and reduced Si-O-Si band angles. Studies on metallic honeycomb catalysts have been used to reduce emissions from vehicles in the automobile industry [21,24] and very few studies have investigated the performance of a metallic honeycomb catalyst on PM, CO, and SO2 emission reduction from biomass combustion systems such as rice husks. Materials and Mcoemthboudstsion system for a practical flue gas directly from rice husk combustion
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