VOCs可以代替氨作为还原剂去除NO,同时达到去除VOCs和NO的效果。由于常规热催化净化所需的高能耗和低光催化效率,光热耦合催化净化可以综合光催化和热催化的优点,以达到低能耗高效处理污染物的效果。在这项研究中,采用水热法在各种形貌的Fe-MOF上制备了负载Co和Mn催化剂的样品。通过各种表征研究其理化性质的影响,分析了各催化剂的催化性能,包括XRD,SEM,BET,XPS,H2-TPR,TEM和O2-TPD。表征结果表明,孔隙体积,高价Co和Mn原子,催化剂表面吸附氧和氧晶格缺陷的丰度是影响催化剂性能的最关键因素。根据性能测试的结果,负载Co和Mn的八面体形Fe-MOF制备的催化剂比负载Co和Mn的棒状Fe-MOF具有更好的性能。丙酮和NO的转化率分别达到50%和64%,分别,240°C结果表明,该催化剂能够同时去除丙酮和NO。与不含Co和Mn的纯Fe-MOF相比,在多种因素的综合作用下,负载型催化剂同时去除丙酮和NO的能力明显更高。根据Mars-vanKrevelen(MvK)机理,研究了丙酮和NO在催化剂表面催化转化的关键反应步骤,并提出了一种可能的机制。这项研究提出了一种通过光热耦合同时去除丙酮和NOx的新思路。
VOCs can be used instead of ammonia as a reducing agent to remove NO, achieving the effect of removing VOCs and NO simultaneously. Due to the high energy consumption and low photocatalytic efficiency required for conventional thermocatalytic purification, photothermal coupled catalytic purification can integrate the advantages of photocatalysis and thermocatalysis in order to achieve the effect of pollutants being treated efficiently with a low energy consumption. In this study, samples loaded with Co and Mn catalysts were prepared using the hydrothermal method on Fe-MOF with various morphologies. The catalytic performance of each catalyst was analyzed by studying the effects of their physicochemical properties through various characterizations, including XRD, SEM, BET, XPS, H2-TPR, TEM and O2-TPD. The characterization results demonstrated that the specific surface area, pore volume, high valence Co and Mn atoms, surface adsorbed oxygen and the abundance of oxygen lattice defects in the catalysts were the most critical factors affecting the performance of the catalysts. Based on the results of the performance tests, the catalysts prepared with an octahedral-shaped Fe-MOF loaded with Co and Mn showed a better performance than those loaded with Co and Mn on a rod-shaped Fe-MOF. The conversions of acetone and NO reached 50% and 64%, respectively, at 240 °C. The results showed that the catalysts were capable of removing acetone and NO at the same time. Compared with the pure Fe-MOF without Co and Mn, the loaded catalysts showed a significantly higher ability to remove acetone and NO simultaneously under the combination of various factors. The key reaction steps for the catalytic conversion of acetone and NO on the catalyst surface were investigated according to the Mars-van Krevelen (MvK) mechanism, and a possible mechanism was proposed. This study presents a new idea for the simultaneous removal of acetone and NOx by photothermal coupling.