Lu Zhao, Lei Zhang, Hao Shu, Yang Jia, Lei Zhang, Fang Bai, Xiaosheng Chen
School of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China.
Institute of Water Resources and Hydro-Electric Engineering, Xi'an University of Technology, Xi'an 710048, China.
ACS Omega. 2020 Dec 8;5(50):32216-32226. doi: 10.1021/acsomega.0c03672. eCollection 2020 Dec 22.
In this article, blast furnace slag, a high-yield industrial solid waste, was taken as the research object and it was used as the main material. Bentonite was used as the binder, and water was added to shape the blast furnace slag into a small column. The denitration catalyst was prepared using different methods, its denitration performances were compared and analyzed, and the best preparation method and process parameters were screened. Results showed that bentonite will clearly improve denitration performance, and 4:1 blast furnace slag and bentonite was selected as the molding ratio to reduce the effect of bentonite on its performance, combined with the hardness and surface adhesion of the prepared carrier. Separately, the catalysts were prepared using citric acid impregnation, hydrothermal decomposition, and mixing method, and active Mn was loaded. Among them, the hydrothermal decomposition method cannot completely decompose in a closed kettle, resulting in a lower denitration performance. The catalyst prepared using the mixing method is superior to that prepared using the impregnation method because the active component prepared by the former was more uniformly dispersed, and simple and easy to operate, which can meet the needs of the excess denitration catalysts of small enterprises.
本文以高炉矿渣这种高产量工业固体废弃物为研究对象，并将其作为主要原料。以膨润土作为粘结剂，加水将高炉矿渣制成小柱状。采用不同方法制备脱硝催化剂，比较分析其脱硝性能，筛选出最佳制备方法及工艺参数。结果表明，膨润土能明显提高脱硝性能，综合考虑制备载体的硬度和表面附着力，选择4:1的高炉矿渣与膨润土作为成型比例，以降低膨润土对其性能的影响。分别采用柠檬酸浸渍法、水热分解法和混合法制备催化剂并负载活性锰。其中，水热分解法在密闭反应釜中不能完全分解，导致脱硝性能较低。采用混合法制备的催化剂优于浸渍法制备的催化剂，因为前者制备的活性组分分散更均匀，且操作简单易行，能满足小企业脱硝催化剂用量过剩的需求。
