PDF(Pubmed)
Abstract：
The substitution of ethyl acetate for ammonia in NH3-SCR provides a novel strategy for the simultaneous removal of VOCs and NO. In this study, three distinct types of biochar were fabricated through pyrolysis at 700 °C. MnOx and TiO2 were sequentially loaded onto these biochar substrates via a hydrothermal process, yielding a family of biochar-based catalysts with optimized dosages. Upon exposure to xenon lamp irradiation at 240 °C, the biochar catalyst designated as 700-12-3GN, derived from Ginkgo shells, demonstrated the highest catalytic activity when contrasted with its counterparts prepared from moso bamboo and loofah. The conversion efficiencies for NO and ethyl acetate (EA) peaked at 73.66% and 62.09%, respectively, at a catalyst loading of 300 mg. The characterization results indicate that the 700-12-3GN catalyst exhibits superior activity, which can be attributed to the higher concentration of Mn4+ and Ti4+ species, along with its superior redox properties and suitable elemental distribution. Notably, the 700-12-3GN catalyst has the smallest specific surface area but the largest pore volume and average BJH pore size, indicating that the specific surface area is not the predominant factor affecting catalyst performance. Instead, pore volume and average BJH pore diameter appear to be the more influential parameters. This research provides a reference and prospect for the resource utilization of biochar and the development of photothermal co-catalytic ethyl acetate and NO at low cost.
摘要：
在NH3-SCR中用乙酸乙酯代替氨提供了同时去除VOC和NO的新策略。在这项研究中,通过在700°C下的热解制造了三种不同类型的生物炭。通过水热法将MnOx和TiO2依次加载到这些生物炭基材上，产生具有优化剂量的生物炭基催化剂家族。暴露在240°C的氙灯照射下，生物炭催化剂被指定为700-12-3GN，源自银杏壳，与由毛竹和丝瓜制备的同类物相比，表现出最高的催化活性。NO和乙酸乙酯(EA)的转化效率分别为73.66%和62.09%。分别,在300mg的催化剂负载下。表征结果表明,700-12-3GN催化剂具有优越的活性,这可以归因于更高浓度的Mn4+和Ti4+物种，以及其优越的氧化还原性能和合适的元素分布。值得注意的是,700-12-3GN催化剂具有最小的比表面积，但最大的孔体积和平均BJH孔径，表明比表面积不是影响催化剂性能的主要因素。相反，孔体积和平均BJH孔径似乎是更有影响的参数。该研究为生物炭的资源化利用以及低成本开发光热催化乙酸乙酯和NO提供了参考和展望。
