Xi'an University of Science and Technology, Xi'an, 710054, China.
Key Laboratory of Coal Resources Exploration and Comprehensive Utilization, Ministry of Land and Resources Xi'an, Xi'an, 710021, China.
Sci Rep. 2019 Aug 12;9(1):11604. doi: 10.1038/s41598-019-47947-2.
Treatment with selective catalytic oxidation (SCO) is an effective technology applied recently for conversion of nitrogen oxides pollution control. In order to solve the problems of high cost and difficulties in practical application of SCO catalyst, it was put forward using the solid waste sludge from soybean oil plant as catalyst carrier to prepare denitration catalyst. The sludge was treated by alkaline activation and then MnOx-based sludge was prepared by impregnation. Finally, MnOx-based sludge was calcined in the muffle furnace. The effects of activation and calcination conditions on catalyst activity were investigated. Fourier transform infrared (FTIR), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to characterize the activity of the sludge based denitration catalyst, and the structure and activity of the sludge based denitration catalyst were furtherly confirmed. According to the achieved results, (1) after activated by LiOH with a mass concentration of 15% for 4 hours, the surface of the sludge catalyst has more alkali functional groups, making the denitration of sludge catalyst the best; (2) the MnOx-based catalyst calcined in the muffle furnace with calcination temperature of 450 °C for 4 hours has obvious denitration efficiency.
采用选择性催化氧化（SCO）处理是最近应用于氮氧化物污染控制的一种有效技术。为了解决 SCO 催化剂成本高和实际应用困难的问题，提出了以大豆油厂的废渣为催化剂载体，制备脱硝催化剂。对废渣进行碱活化处理，然后通过浸渍法制备 MnOx 基污泥，最后在马弗炉中煅烧 MnOx 基污泥。考察了活化和煅烧条件对催化剂活性的影响。采用傅里叶变换红外（FTIR）、X 射线光电子能谱（XPS）、X 射线衍射（XRD）和扫描电子显微镜（SEM）对污泥基脱硝催化剂的活性进行了表征，进一步证实了污泥基脱硝催化剂的结构和活性。结果表明：（1）用质量浓度为 15%的 LiOH 活化 4 小时后，污泥催化剂表面具有更多的碱性官能团，使污泥催化剂的脱硝效果最佳；（2）在马弗炉中以 450℃煅烧 4 小时的 MnOx 基催化剂具有明显的脱硝效率。
