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Formic acid as the in-situ hydrogen source for catalytic reduction of nitrate in water by PdAg alloy nanoparticles supported on amine-functionalized SiO2
Ding, Yajun; Sun, Wuzhu; Yang, Weiyi; Li, Qi; Li, Q (reprint author), 72 Wenhua Rd, Shenyang 110016, Liaoning Provin, Peoples R China.
2017-04-01
发表期刊APPLIED CATALYSIS B-ENVIRONMENTAL
ISSN0926-3373
卷号203页码:372-380
摘要Nitrate pollution in water is becoming a severe problem all over the world, and the catalytic reduction of nitrate by reducing agents had been considered as one of the most promising methods because it could convert nitrate to harmless nitrogen gas with a high efficiency. In this work, the PdAg/SiO2-NH2 catalyst was developed by firstly loading Pd onto ---NH2 surface-modified SiO2 catalyst support, followed by a controlled surface reaction to load Ag and create PdAg alloy nanoparticles on SiO2-NH2 catalyst support. For the first time, the PdAg/SiO2-NH2 catalyst was found to be able to effectively reduce nitrate with HCOOH as the reducing agent precursor. Its enhanced nitrate reduction performance could be attributed to the combination effects from the surface -NH2 modification and the better electron transfer from Ag to Pd than from other metals due to their larger difference of work function, both of which were beneficial for the catalytic HCOOH decomposition to provide the in situ sources of the reducing agent of H-2 and buffer of CO2 for the catalytic nitrate reduction process. To optimize the nitrate reduction performance of the PdAg/SiO2-NH2 catalyst, Ag content was carefully modulated and the Pd:Ag molar ratio of 1:0.5 was found to have the most efficient nitrate reduction capability. (C) 2016 Elsevier B.V. All rights reserved.; Nitrate pollution in water is becoming a severe problem all over the world, and the catalytic reduction of nitrate by reducing agents had been considered as one of the most promising methods because it could convert nitrate to harmless nitrogen gas with a high efficiency. In this work, the PdAg/SiO2-NH2 catalyst was developed by firstly loading Pd onto ---NH2 surface-modified SiO2 catalyst support, followed by a controlled surface reaction to load Ag and create PdAg alloy nanoparticles on SiO2-NH2 catalyst support. For the first time, the PdAg/SiO2-NH2 catalyst was found to be able to effectively reduce nitrate with HCOOH as the reducing agent precursor. Its enhanced nitrate reduction performance could be attributed to the combination effects from the surface -NH2 modification and the better electron transfer from Ag to Pd than from other metals due to their larger difference of work function, both of which were beneficial for the catalytic HCOOH decomposition to provide the in situ sources of the reducing agent of H-2 and buffer of CO2 for the catalytic nitrate reduction process. To optimize the nitrate reduction performance of the PdAg/SiO2-NH2 catalyst, Ag content was carefully modulated and the Pd:Ag molar ratio of 1:0.5 was found to have the most efficient nitrate reduction capability. (C) 2016 Elsevier B.V. All rights reserved.
部门归属[ding, yajun ; sun, wuzhu ; yang, weiyi ; li, qi] chinese acad sci, inst met res, shenyang natl lab mat sci, environm funct mat div, shenyang 110016, peoples r china ; [ding, yajun] univ sci & technol china, sch mat sci & engn, hefei 230026, peoples r china ; [sun, wuzhu] shandong univ technol, sch mat sci & engn, zibo 255000, peoples r china
关键词Catalytic Nitrate Reduction Formic Acid Pdag/sio2-nh2 Catalyst -nh2 Surface Modification Electron Transfer
学科领域Chemistry, Physical ; Engineering, Environmental ; Engineering, Chemical
资助者Basic Science Innovation Program of Shenyang National Laboratory for Materials Science [Y4N56R1161, Y4N56F2161]; National Natural Science Foundation of China [51502305]
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/78217
专题中国科学院金属研究所
通讯作者Li, Q (reprint author), 72 Wenhua Rd, Shenyang 110016, Liaoning Provin, Peoples R China.
推荐引用方式
GB/T 7714
Ding, Yajun,Sun, Wuzhu,Yang, Weiyi,et al. Formic acid as the in-situ hydrogen source for catalytic reduction of nitrate in water by PdAg alloy nanoparticles supported on amine-functionalized SiO2[J]. APPLIED CATALYSIS B-ENVIRONMENTAL,2017,203:372-380.
APA Ding, Yajun,Sun, Wuzhu,Yang, Weiyi,Li, Qi,&Li, Q .(2017).Formic acid as the in-situ hydrogen source for catalytic reduction of nitrate in water by PdAg alloy nanoparticles supported on amine-functionalized SiO2.APPLIED CATALYSIS B-ENVIRONMENTAL,203,372-380.
MLA Ding, Yajun,et al."Formic acid as the in-situ hydrogen source for catalytic reduction of nitrate in water by PdAg alloy nanoparticles supported on amine-functionalized SiO2".APPLIED CATALYSIS B-ENVIRONMENTAL 203(2017):372-380.
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