ZnCl2-activated S/N-doped biochar for low-temperature NH3-SCR of NOx: Performance and pathway analysis
Carbon-based catalysts for low-temperature denitrification were prepared from wheat straw via ZnCl2 activation and thiourea doping. The catalysts were systematically characterized using BET surface area analysis, NH3-TPD, XPS, and transient response experiments. The ZnCl2-activated catalyst exhibite...
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Elsevier
2025-06-01
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| Series: | Green Energy and Resources |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2949720525000207 |
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| author | Shuangshuang Yan Dongmei Bi Chengxizi Zhang Zhisen He Yu Ni Kang Yue Shanjian Liu |
| author_facet | Shuangshuang Yan Dongmei Bi Chengxizi Zhang Zhisen He Yu Ni Kang Yue Shanjian Liu |
| author_sort | Shuangshuang Yan |
| collection | DOAJ |
| description | Carbon-based catalysts for low-temperature denitrification were prepared from wheat straw via ZnCl2 activation and thiourea doping. The catalysts were systematically characterized using BET surface area analysis, NH3-TPD, XPS, and transient response experiments. The ZnCl2-activated catalyst exhibited a NOx reduction efficiency of 45.1%. To further enhance the denitrification performance, the Z1.2 biochar was co-doped with sulfur and nitrogen. Experimental results demonstrated that the SN2.5Z1.2/AC biochar catalyst achieved a maximum NO conversion of 88% within the temperature range of 50–260°C and exhibited stable activity in long-term durability tests. Sulfur and nitrogen co-doping markedly increased the number of strong acid sites and surface chemisorbed oxygen (Oα), thereby facilitating the formation of N-6 functional groups. The presence of C-SO3-H species may be a critical factor contributing to the enhanced NOx conversion. The denitrification process over sulfur- and nitrogen-doped biochar follows both the Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) mechanisms, wherein •NH2 radicals play a pivotal role in the reduction of NO to its gaseous and adsorbed forms. |
| format | Article |
| id | doaj-art-cc31bc75ad7a4a46ad3a8dccc387eacc |
| institution | DOAJ |
| issn | 2949-7205 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Green Energy and Resources |
| spelling | doaj-art-cc31bc75ad7a4a46ad3a8dccc387eacc2025-08-20T03:09:05ZengElsevierGreen Energy and Resources2949-72052025-06-013210013310.1016/j.gerr.2025.100133ZnCl2-activated S/N-doped biochar for low-temperature NH3-SCR of NOx: Performance and pathway analysisShuangshuang Yan0Dongmei Bi1Chengxizi Zhang2Zhisen He3Yu Ni4Kang Yue5Shanjian Liu6School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255000, China; Branch of State Key Laboratory of Woody Oil Resources Utilization at Shandong University of Technology, Zibo, 255000, ChinaSchool of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255000, China; Branch of State Key Laboratory of Woody Oil Resources Utilization at Shandong University of Technology, Zibo, 255000, China; Corresponding author.School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255000, China; Branch of State Key Laboratory of Woody Oil Resources Utilization at Shandong University of Technology, Zibo, 255000, ChinaSchool of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255000, China; Branch of State Key Laboratory of Woody Oil Resources Utilization at Shandong University of Technology, Zibo, 255000, China; School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, United KingdomSchool of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255000, China; Branch of State Key Laboratory of Woody Oil Resources Utilization at Shandong University of Technology, Zibo, 255000, ChinaSchool of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255000, China; Branch of State Key Laboratory of Woody Oil Resources Utilization at Shandong University of Technology, Zibo, 255000, ChinaSchool of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, 255000, China; Branch of State Key Laboratory of Woody Oil Resources Utilization at Shandong University of Technology, Zibo, 255000, China; School of Engineering and Physical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, United KingdomCarbon-based catalysts for low-temperature denitrification were prepared from wheat straw via ZnCl2 activation and thiourea doping. The catalysts were systematically characterized using BET surface area analysis, NH3-TPD, XPS, and transient response experiments. The ZnCl2-activated catalyst exhibited a NOx reduction efficiency of 45.1%. To further enhance the denitrification performance, the Z1.2 biochar was co-doped with sulfur and nitrogen. Experimental results demonstrated that the SN2.5Z1.2/AC biochar catalyst achieved a maximum NO conversion of 88% within the temperature range of 50–260°C and exhibited stable activity in long-term durability tests. Sulfur and nitrogen co-doping markedly increased the number of strong acid sites and surface chemisorbed oxygen (Oα), thereby facilitating the formation of N-6 functional groups. The presence of C-SO3-H species may be a critical factor contributing to the enhanced NOx conversion. The denitrification process over sulfur- and nitrogen-doped biochar follows both the Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) mechanisms, wherein •NH2 radicals play a pivotal role in the reduction of NO to its gaseous and adsorbed forms.http://www.sciencedirect.com/science/article/pii/S2949720525000207NOxNH3-SCRBiocharN2 selectivityReaction mechanism |
| spellingShingle | Shuangshuang Yan Dongmei Bi Chengxizi Zhang Zhisen He Yu Ni Kang Yue Shanjian Liu ZnCl2-activated S/N-doped biochar for low-temperature NH3-SCR of NOx: Performance and pathway analysis Green Energy and Resources NOx NH3-SCR Biochar N2 selectivity Reaction mechanism |
| title | ZnCl2-activated S/N-doped biochar for low-temperature NH3-SCR of NOx: Performance and pathway analysis |
| title_full | ZnCl2-activated S/N-doped biochar for low-temperature NH3-SCR of NOx: Performance and pathway analysis |
| title_fullStr | ZnCl2-activated S/N-doped biochar for low-temperature NH3-SCR of NOx: Performance and pathway analysis |
| title_full_unstemmed | ZnCl2-activated S/N-doped biochar for low-temperature NH3-SCR of NOx: Performance and pathway analysis |
| title_short | ZnCl2-activated S/N-doped biochar for low-temperature NH3-SCR of NOx: Performance and pathway analysis |
| title_sort | zncl2 activated s n doped biochar for low temperature nh3 scr of nox performance and pathway analysis |
| topic | NOx NH3-SCR Biochar N2 selectivity Reaction mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S2949720525000207 |
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