Synthesis of Highly Dispersed Palladium Nanoparticles Supported on Silica for Catalytic Combustion of Methane
文献类型：期刊论文
| 作者 | Cao, Peng; Yan, Bo; Chu, Yuting; Wang, Shiwei; Yu, Hongbo; Li, Tong; Xiong, Chunrong; Yin, Hongfeng |
| 刊名 | INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
 |
| 出版日期 | 2021 |
| 卷号 | 60期号:20页码:7545-7557 |
| 关键词 | ENHANCED DRY IMPREGNATION YOLK-SHELL NANOCATALYSTS PARTICLE-SIZE SURFACE-AREA BASE METALS OXIDATION ADSORPTION NOBLE REACTIVITY CLUSTERS |
| 英文摘要 | Palladium nanoparticles supported on silica catalysts (Pd/SiO2) were prepared by wet impregnation (WI), dry impregnation (DI), strong electrostatic adsorption (SEA), and charge-enhanced dry impregnation (CEDI) methods. The Pd/SiO2 samples with highly dispersed and tight size-distributed palladium nanoparticles are obtained via SEA and CEDI methods based on strong electrostatic interactions between the dissolved metal precursor ([Pd(NH3)(4)](2+)) and positively charged SiO2 support in an alkali-impregnating solution (initial pH = 12). The Pd/SiO2-SEA samples prepared by the SEA method usually showed higher palladium dispersions (>50%) than those prepared by CEDI (Pd dispersion = 32-45%). The surface loading (support surface area per liter of preparation solution), pH regulator (NaOH or NH4OH), Pd loading, and reduction temperature were shown to be key factors affecting the dispersion of palladium in the Pd/SiO2-SEA samples, as well as the leaching/dissolution of SiO2 and palladium in the alkali solution. The Pd/SiO2-SEA samples prepared with proper SLs of 30,000-100,000 m(2) L-1 using NH4OH as the pH regulator exhibited not only very high Pd dispersions (64-97%) but also negligible losses of SiO2 and Pd in the impregnating solution. The Pd/SiO2-SEA samples also exhibited better catalytic performance in methane combustion based on both the T-10 and T-50 temperatures and the intrinsic activities (mass-specific activity and/or turnover frequency (TOFs)). The TOFs generally decreased from 130 h(-1)to 6.2 h(-1) as Pd dispersion increased from 32% to 97% for the Pd/SiO2-SEA(NH4OH) catalysts. Moreover, the reaction activity of Pd/SiO2-SEA catalysts was significantly improved by increasing the fraction of Pd-0 in the range of 70-85%, indicating that this size-sensitive catalysis would be related to the redox properties of the supported Pd nanoparticles. |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/21893]  |
| 专题 | 中国科学院宁波材料技术与工程研究所 2021专题_期刊论文 |
| 作者单位 | 1.Xiong, CR (corresponding author), Hainan Univ, Hainan Prov Fine Chem Engn Res Ctr, State Key Lab Marine Resource Utilizat South Chin, Special Glass Key Lab Hainan Prov, Haikou 570228, Hainan, Peoples R China. 2.Yan, B 3.Yin, HF (corresponding author), Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, Ningbo 315201, Zhejiang, Peoples R China. |
| 推荐引用方式 GB/T 7714 | Cao, Peng,Yan, Bo,Chu, Yuting,et al. Synthesis of Highly Dispersed Palladium Nanoparticles Supported on Silica for Catalytic Combustion of Methane[J]. INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,2021,60(20):7545-7557. |
| APA | Cao, Peng.,Yan, Bo.,Chu, Yuting.,Wang, Shiwei.,Yu, Hongbo.,...&Yin, Hongfeng.(2021).Synthesis of Highly Dispersed Palladium Nanoparticles Supported on Silica for Catalytic Combustion of Methane.INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH,60(20),7545-7557. |
| MLA | Cao, Peng,et al."Synthesis of Highly Dispersed Palladium Nanoparticles Supported on Silica for Catalytic Combustion of Methane".INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH 60.20(2021):7545-7557. |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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