标题：Keggin-tungstophosphoric acid decorated Fe2O3 nanoring as a new catalyst for selective catalytic reduction of NOx with ammonia
作者：Ren, Zhaoyong; Teng, Yunfei; Zhao, Leyu; Wang, Rui
作者机构：[Ren, Zhaoyong; Teng, Yunfei; Zhao, Leyu; Wang, Rui] Shandong Univ, Sch Environm Sci & Engn, 27 Shanda South Rd, Jinan 250199, Shandong, Peoples R Chi 更多
会议名称：2nd International Symposium on Catalytic Science and Technology in Sustainable Energy and Environment (EECAT)
会议日期：OCT 11-14, 2016
关键词：TPA; alpha-Fe2O3 nanorings; NH3-TPD; NH3-SCR; SO2-tolerance
摘要：With the aim of developing a new sort of highly effective and eco-friendly catalyst for NOx abatement, 40 wt.% 12-tungstophosphoric acid (TPA)-decorated Fe2O3 nanorings were synthesized via a microwave-assisted hydrothermal method followed by simple mechanical-chemistry grinding. Analyses of SEM, TEM and XRD demonstrated the successful synthesis of Fe2O3 nanorings. HRTEM image manifested that 3 layers of TPA polyanions were coated on the external surface of Fe2O3 nanorings. FTIR and NH3-TPD were also employed to characterize the loading of TPA on Fe2O3 and the distribution of acid sites of the composite material. The results indicated the existence of interaction between the terminal oxygen of TPA and Fe3+ of Fe2O3 nanorings. H-2-TPR and SCR experiment showed that TPA played a significant promotion role in the SCR reaction of NOx, while Fe2O3 served not only as the active ingredient but also as the support of TPA. TPA/Fe2O3 achieved a satisfactory SCR performance, with the NOx conversion higher than 92% maintained in a wide temperature range between 230 and 500 degrees C. Additionally, the catalyst exhibited an excellent SO2-resistance capacity.