Co-blending modification of activated coke using pyrolusite and titanium ore for low-temperature NOx removal

• Published in: Scientific reports 2020-11, Vol.10 (1), p.19455-19455, Article 19455
• Main Authors: Yang, Lin, Yao, Lu, Lai, Yuguo, Jiang, Xia, Jiang, Wenju
• Format: Article
• Language: English
• Subjects: 639/166/898; 704/172/169/896; Acidity; Ammonia; Catalysts; Coke; Electron transfer; Humanities and Social Sciences; Low temperature; Mass transfer; multidisciplinary; Science; Science (multidisciplinary); Synergistic effect; Titanium
• ISSN: 2045-2322; 2045-2322
• DOI: 10.1038/s41598-020-76592-3

Activated coke (AC) has great potential in the field of low-temperature NO removal (DeNO x ), especially the branch prepared by blending modification. In this study, the AC-based pyrolusite and/or titanium ore blended catalysts were prepared and applied for DeNO x . The results show blending pyrolusite and titanium ore promoted the catalytic performance of AC (Px@AC, Tix@AC) clearly, and the co-blending of two of them showed a synergistic effect. The (P/Ti-1/2)15@AC performed the highest NO conversion of 66.4%, improved 16.9% and 16.0% respectively compared with P15@AC and Ti15@AC. For the (P/Ti-1/2)15@AC DeNO x , its relative better porous structure (S BET  = 364 m 2 /g, V mic  = 0.156 cm 3 /g) makes better mass transfer and more active sites exposure, stronger surface acidity (C–O, 19.43%; C=O, 4.16%) is more favorable to the NH 3 adsorption, and Ti, Mn and Fe formed bridge structure fasted the lactic oxygen recovery and electron transfer. The DeNO x of (P/Ti-1/2)15@AC followed both the E–R and L–H mechanism, both the gaseous and adsorbed NO reacted with the activated NH 3 due to the active sites provided by both the carbon and titanium.