Graduate Institute of Environmental Engineering, National Central University, Taoyuan City 32001, Chinese Taipei.
Department of Chemical Engineering, National Taipei University of Technology, Taipei City 10608, Chinese Taipei.
J Environ Sci (China). 2018 Jul;69:205-216. doi: 10.1016/j.jes.2017.10.012. Epub 2017 Nov 3.
Double perovskite-type catalysts including LaCoMnO and LaCuMnO are first evaluated for the effectiveness in removing volatile organic compounds (VOCs), and single perovskites (LaCoO, LaMnO, and LaCuO) are also tested for comparison. All perovskites are tested with the gas hourly space velocity (GHSV) of 30,000hr, and the temperature range of 100-600°C for CH removal. Experimental results indicate that double perovskites have better activity if compared with single perovskites. Especially, toluene (CH) can be completely oxidized to CO at 300°C as LaCoMnO is applied. Characterization of catalysts indicates that double perovskites own unique surface properties and are of higher amounts of lattice oxygen, leading to higher activity. Additionally, apparent activation energy of 68kJ/mol is calculated using Mars-van Krevelen model for CH oxidation with LaCoMnO as catalyst. For durability test, both LaCoMnO and LaCuMnO maintain high CH removal efficiencies of 100% and 98%, respectively, at 300°C and 30,000hr, and they also show good resistance to CO (5%) and HO (5%) of the gas streams tested. For various VOCs including isopropyl alcohol (CHO), ethanal (CHO), and ethylene (CH) tested, as high as 100% efficiency could be achieved with double perovskite-type catalysts operated at 300-350°C, indicating that double perovskites are promising catalysts for VOCs removal.
双钙钛矿型催化剂，包括 LaCoMnO 和 LaCuMnO，首先被评估用于去除挥发性有机化合物（VOCs）的效果，同时也测试了单钙钛矿（LaCoO、LaMnO 和 LaCuO）进行比较。所有的钙钛矿都在 30000hr 的空时气速（GHSV）和 100-600°C 的温度范围内进行 CH 去除测试。实验结果表明，与单钙钛矿相比，双钙钛矿具有更好的活性。特别是，当使用 LaCoMnO 时，甲苯（CH）可以在 300°C 完全氧化为 CO。催化剂的表征表明，双钙钛矿具有独特的表面性质和更高的晶格氧含量，从而具有更高的活性。此外，使用 Mars-van Krevelen 模型计算出 LaCoMnO 催化 CH 氧化的表观活化能为 68kJ/mol。在耐久性测试中，LaCoMnO 和 LaCuMnO 在 300°C 和 30000hr 下分别保持高达 100%和 98%的高 CH 去除效率，并且它们还表现出对测试气体中 CO（5%）和 HO（5%）的良好抗性。对于测试的各种 VOCs，包括异丙醇（CHO）、乙醛（CHO）和乙烯（CH），双钙钛矿型催化剂在 300-350°C 下操作时，效率高达 100%，表明双钙钛矿是去除 VOCs 的有前途的催化剂。
