Lu Weizhe, Lu Hanfeng, Zhang Zekai
Institute of Catalytic Reaction Engineering, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, People's Republic of China.
R Soc Open Sci. 2019 Jan 30;6(1):180669. doi: 10.1098/rsos.180669. eCollection 2019 Jan.
NH-SCR is an environmentally important reaction for the abatement of NO from different resources. MnO-based catalyst has attracted significant attention due to the excellent activity. In this paper, a series of MnWO /TiO-SiO catalysts were prepared by liquid-phase deposition method. The catalysts were characterized by N adsorption/desorption, XRD, TEM, XPS, FT-IR, H-TPR, TG and water adsorption capacity. The existence of SiO improved the SO and HO resistance of the MnWO /TiO-SiO catalyst without decreasing the NH-SCR activity. Under the reaction conditions of 260°C and 60 000 ml g h gas hourly space velocity (GHSV), the NO conversion was kept stable at about 95% for 140 min on stream. The excellent performance of MnWO /TiO-SiO catalyst is considered to be originated from the texture properties and active species dispersion improvement by SiO in the support and low-temperature preparation.
NH-SCR是一种对减少来自不同来源的NO具有重要环境意义的反应。基于MnO的催化剂因其优异的活性而备受关注。本文采用液相沉积法制备了一系列MnWO₄/TiO₂-SiO₂催化剂。通过N₂吸附/脱附、XRD、TEM、XPS、FT-IR、H₂-TPR、TG和水吸附容量对催化剂进行了表征。SiO₂的存在提高了MnWO₄/TiO₂-SiO₂催化剂的抗SO₂和抗H₂O性能，同时不降低NH-SCR活性。在260°C和60000 ml·g⁻¹·h⁻¹的气体时空速（GHSV）反应条件下，NO转化率在连续运行140 min时保持稳定在约95%。MnWO₄/TiO₂-SiO₂催化剂的优异性能被认为源于SiO₂在载体中的织构性质和活性物种分散的改善以及低温制备。
