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Promotion effect of water in catalytic fireplace soot oxidation over silver and platinum

机译：水对银和铂催化壁炉烟尘氧化的促进作用

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Fireplaces are one of the largest sources of soot emissions. One possible approach to reduce wood-based soot emission is to use catalysts that have been designed for fireplace applications. This study compares the activities of silver and platinum catalysts in the oxidation of real fireplace soot in different gas atmospheres. Another goal is to examine the effects of water on the catalyst activity depending on the moisture content in the reaction gas. The study shows that the gas feed composition affects the performance of the catalyst. Unlike platinum, the silver catalyst directly oxidizes the soot in the presence of air and NO. The addition of water into the air promotes the soot oxidation activity of both the silver and platinum catalysts. The catalysts improve their activity with the increase in water content. For both the silver and platinum catalysts, the partial dissociation of water with oxygen and the formation of hydroxyls are promoted, which oxidize soot. Thermal ageing shows that silver has a higher thermal stability and retains its oxidation activity for longer than platinum under all of the applied conditions. Silver is a more suitable option for the catalytic oxidation of soot emission of fireplaces.
机译：壁炉是最大的烟尘排放源之一。减少木质烟灰排放的一种可能方法是使用专为壁炉应用设计的催化剂。这项研究比较了在不同气体气氛下，银和铂催化剂在真实壁炉烟灰氧化中的活性。另一个目的是根据反应气体中的水分含量检查水对催化剂活性的影响。研究表明，气体进料组成会影响催化剂的性能。与铂不同，银催化剂在空气和NO存在下直接氧化烟灰。向空气中添加水可促进银和铂催化剂的烟灰氧化活性。随着水含量的增加，催化剂提高了它们的活性。对于银和铂催化剂，都促进了水与氧气的部分离解和羟基的形成，从而氧化了烟灰。热老化表明，在所有应用条件下，银均具有比铂更高的热稳定性，并保持其氧化活性更长的时间。对于壁炉烟尘排放的催化氧化，银是更合适的选择。

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