Abstract
An awareness of increasing climate and health problems has driven the development of new functional and affordable soot-oxidation catalysts for stationary sources, such as fireplaces. In this study, Al(OH)3, water glass and acidic aluminium phosphate binder materials were mixed with soot-oxidation catalysts. The effect of the binder on the performance of the Ag/La-Al2O3 catalyst was examined, while the Pt/La-Al2O3 catalyst bound with Al(OH)3 was used as a reference. Soot was oxidised above 340 °C on the Ag/La-Al2O3 catalyst, but at 310 °C with same catalyst bound with Al(OH)3. The addition of water glass decreased the catalytic performance because large silver crystals and agglomeration resulted in a blockage of the support material’s pores. Pt/La-Al2O3 bound with Al(OH)3 was ineffective in a fireplace environment. We believe that AgOx is the active form of silver in the catalyst. Hence, Ag/La-Al2O3 was shown to be compatible with the Al(OH)3 binder as an effective catalyst for fireplace soot oxidation.
Highlights
Soot is a natural product that forms during incomplete combustion when organic compounds and fossil fuels are pyrolysed [1]
PM emission standards for new fireplaces already exist in some states of the US, which creates more pressure for fireplace manufacturers in Europe to develop efficient working systems that reduce the formation of soot and particulate matter; technology for the prevention of soot formation in wood-combustion processes is still in its infancy
Water glass is presumed to have blocked the pores of the support material, resulting in limited access. These results indicate that the was very important water glass was used to the silver inside the pores, as preparation highlighted method by the low surface area ofwhen this catalyst
Summary
Soot is a natural product that forms during incomplete combustion when organic compounds and fossil fuels are pyrolysed [1]. Due to a lack of oxygen, burning is often incomplete, especially in fireplaces, which leads to the formation of particulate matter (PM) and soot. Wood is a main household heating source in Europe, especially in winter, with fireplace emissions approaching dangerously high levels [5,6]. A standard and systematic emissions control system, such as those for vehicles, does not exist in Europe; the EU plans to restrict domestic fireplace and stove emissions, such as PM2.5, in the near future [6]. PM emission standards for new fireplaces already exist in some states of the US, which creates more pressure for fireplace manufacturers in Europe to develop efficient working systems that reduce the formation of soot and particulate matter; technology for the prevention of soot formation in wood-combustion processes is still in its infancy
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