1
|
Yigit K, Wang J, Si Q, Du X, Sun Q, Zhang Y, Li Z, Wang S. Investigation on activation characterization, secondary electron yield, and surface resistance of novel quinary alloy Ti-Zr-V-Hf-Cu non-evaporable getters. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2024; 95:063908. [PMID: 38940644 DOI: 10.1063/5.0198398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Accepted: 06/07/2024] [Indexed: 06/29/2024]
Abstract
The performance of next-generation particle accelerators has been adversely affected by the occurrence of electron multipacting and vacuum instabilities. Particularly, minimization of secondary electron emission (SEE) and reduction of surface resistance are two critical issues to prevent some of the phenomena such as beam instability, reduction of beam lifetime, and residual gas ionization, all of which occur as a result of these adverse effects in next-generation particle accelerators. For the first time, novel quinary alloy Ti-Zr-V-Hf-Cu non-evaporable getter (NEG) films were prepared on stainless steel substrates by using the direct current magnetron sputtering technique to reduce surface resistance and SEE yield with an efficient pumping performance. Based on the experimental findings, the surface resistance of the quinary Ti-Zr-V-Hf-Cu NEG films was established to be 6.6 × 10-7 Ω m for sample no. 1, 6.4 × 10-7 Ω m for sample no. 2, and 6.2 × 10-7 Ω m for sample no. 3. The δmax measurements recorded for Ti-Zr-V-Hf-Cu NEG films are 1.33 for sample no. 1, 1.34 for sample no. 2, and 1.35 for sample no. 3. Upon heating the Ti-Zr-V-Hf-Cu NEG film to 150 °C, the XPS spectra results indicated that there are significant changes in the chemical states of its constituent metals, Ti, Zr, V, Hf, and Cu, and these chemical state changes continued with heating at 180 °C. This implies that upon heating at 150 °C, the Ti-Zr-V-Hf-Cu NEG film becomes activated, showing that novel quinary NEG films can be effectively employed as getter pumps for generating ultra-high vacuum conditions.
Collapse
Affiliation(s)
- Kaan Yigit
- Shaanxi Engineering Research Center of Advanced Nuclear Energy & Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology & School of Nuclear Science and Technology & School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Jie Wang
- Shaanxi Engineering Research Center of Advanced Nuclear Energy & Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology & School of Nuclear Science and Technology & School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China
- XJTU-Huzhou Neutron Science Laboratory, Science Valley Medium-sized Building No. 1, Huzhou 313000, Zhejiang, China
| | - Qingyu Si
- Shaanxi Engineering Research Center of Advanced Nuclear Energy & Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology & School of Nuclear Science and Technology & School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Xin Du
- Shaanxi Engineering Research Center of Advanced Nuclear Energy & Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology & School of Nuclear Science and Technology & School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Qiuyu Sun
- Shaanxi Engineering Research Center of Advanced Nuclear Energy & Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology & School of Nuclear Science and Technology & School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Yinqiao Zhang
- Shaanxi Engineering Research Center of Advanced Nuclear Energy & Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology & School of Nuclear Science and Technology & School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Zhifeng Li
- Shaanxi Engineering Research Center of Advanced Nuclear Energy & Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology & School of Nuclear Science and Technology & School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China
- XJTU-Huzhou Neutron Science Laboratory, Science Valley Medium-sized Building No. 1, Huzhou 313000, Zhejiang, China
| | - Sheng Wang
- Shaanxi Engineering Research Center of Advanced Nuclear Energy & Shaanxi Key Laboratory of Advanced Nuclear Energy and Technology & School of Nuclear Science and Technology & School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an, Shaanxi, China
- XJTU-Huzhou Neutron Science Laboratory, Science Valley Medium-sized Building No. 1, Huzhou 313000, Zhejiang, China
| |
Collapse
|
4
|
He D, Hao H, Chen D, Liu J, Yu J, Lu J, Liu F, Wan G, He S, Luo Y. Synthesis and application of rare-earth elements (Gd, Sm, and Nd) doped ceria-based solid solutions for methyl mercaptan catalytic decomposition. Catal Today 2017. [DOI: 10.1016/j.cattod.2016.06.022] [Citation(s) in RCA: 77] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
5
|
Mukherjee D, Venkataswamy P, Devaiah D, Rangaswamy A, Reddy BM. Crucial role of titanium dioxide support in soot oxidation catalysis of manganese doped ceria. Catal Sci Technol 2017. [DOI: 10.1039/c7cy01029j] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The influence of an anatase-TiO2support on the diesel soot oxidation catalytic activity of manganese doped ceria is investigated.
Collapse
Affiliation(s)
- Deboshree Mukherjee
- Inorganic and Physical Chemistry Division
- CSIR–Indian Institute of Chemical Technology
- Hyderabad – 500 007
- India
- Academy of Scientific and Innovative Research
| | | | - Damma Devaiah
- Inorganic and Physical Chemistry Division
- CSIR–Indian Institute of Chemical Technology
- Hyderabad – 500 007
- India
- Chemical Engineering Program
| | - Agolu Rangaswamy
- Inorganic and Physical Chemistry Division
- CSIR–Indian Institute of Chemical Technology
- Hyderabad – 500 007
- India
- Academy of Scientific and Innovative Research
| | - Benjaram M. Reddy
- Inorganic and Physical Chemistry Division
- CSIR–Indian Institute of Chemical Technology
- Hyderabad – 500 007
- India
- Academy of Scientific and Innovative Research
| |
Collapse
|
7
|
Mari M, Müller B, Landfester K, Muñoz-Espí R. Ceria/POLYMER hybrid nanoparticles as efficient catalysts for the hydration of nitriles to amides. ACS APPLIED MATERIALS & INTERFACES 2015; 7:10727-10733. [PMID: 25946747 DOI: 10.1021/acsami.5b01847] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We report the synthesis of ceria/polymer hybrid nanoparticles and their use as effective supported catalysts for the hydration of nitriles to amide, exemplified with the conversion of 2-cyanopiridine to 2-picolinamide. The polymeric cores, made of either polystyrene (PS) or poly(methyl methacrylate) (PMMA), are prepared by miniemulsion copolymerization in the presence of different functional comonomers that provide carboxylic or phosphate groups: acrylic acid, maleic acid, and ethylene glycol methacrylate phosphate. The functional groups of the comonomers generate a corona around the main polymer particle and serve as nucleating agents for the in situ crystallization of cerium(IV) oxide. The obtained hybrid nanoparticles can be easily redispersed in water or ethanol. The conversion of amides to nitriles was quantitative for most of the catalytic samples, with yields close to 100%. According to our experimental observations by high-performance liquid chromatography (HPLC), no work up is needed to separate the product from unreacted substrate. The substrate remains absorbed on the catalyst surface, whereas the product can be easily separated. The catalysts are shown to be recyclable and can be reused for a large number of cycles without loss in efficiency.
Collapse
Affiliation(s)
- Margherita Mari
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Beate Müller
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Katharina Landfester
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| | - Rafael Muñoz-Espí
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany
| |
Collapse
|
9
|
Sudarsanam P, Mallesham B, Durgasri DN, Reddy BM. Physicochemical and catalytic properties of nanosized Au/CeO2 catalysts for eco-friendly oxidation of benzyl alcohol. J IND ENG CHEM 2014. [DOI: 10.1016/j.jiec.2013.11.053] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
11
|
Hou YH, Lin YL, Li Q, Weng WZ, Xia WS, Wan HL. Effects of Polyvinylpyrrolidone on the Preparation of Supported La2O3Catalysts by a Modified Impregnation Method for the Oxidative Coupling of Methane. ChemCatChem 2013. [DOI: 10.1002/cctc.201300667] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|