JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2024
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IF 9.4
Lijun Yue,Wanjun Zhao,Jinfang Li,Ruifang Wu,Yongzhao Wang,Hongxi Zhang,Yongxiang Zhao
The impact of Indium (In) doping upon the catalytic performance of Pd-Cu/Al 2 O 3 for carbon monoxide preferential oxidation (CO-PROX) in hydrogen (H 2 ) rich atmosphere at low temperature has been studied. A series of catalysts with extremely low palladium (Pd) loading (0.06 wt%) are synthesized by the facile co-impregnation method. When the In/copper (Cu) atomic ratio equals 0.25, Pd-Cu-In 0.25 /Al 2 O 3 can keep 40% CO conversion and 100% carbon dioxide (CO 2 ) selectivity at least 120 min at 30 °C, which is significantly superior to the catalytic performance of Pd-Cu/Al 2 O 3 . The elaborate characterization findings reveal that the added In species to Pd-Cu/Al 2 O 3 causes Indium oxide (In 2 O 3 ) to generate, which produces the interaction of In 2 O 3 with Pd-Cu/Al 2 O 3 , further promoting the dispersion of copper chloride hydroxide (Cu 2 Cl(OH) 3 ). Moreover, the modification of In facilitates the re-oxidation of Pd 0 to Pd + through reducing the formation of palladium hydride (PdH x ) during the CO-PROX reaction. Meanwhile, the addition of In leads to the decrease of Cu + electron cloud density, making it easier to be oxidized to Cu 2+ . Collectively, the easy re-oxidation of Pd 0 and Cu + is favorable to fulfill the Wacker cycle between Pd and Cu species, thus improving the catalytic performance for CO-PROX.
研究领域:
催化化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
POWDER TECHNOLOGY
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2020
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IF 4.142
Zhaowang Dong,Yang Xia,Xueyi Guo,Jinlong Zhao,Linfeng Jiang,Qinghua Tian,Yong Liu
Upgraded titania slag (UGS) is a titanium-rich material with over 90 wt% titanium dioxide and some minor elements such as Fe, Al, Cr, and Si, which is mainly used for preparing TiO 2 and TiCl 4 . In this study, UGS was directly reduced with magnesium powder in a hydrogen atmosphere. Titanium alloy hydride powder with the oxygen content of 0.032 wt% was obtained. The minor elements of Fe, Si, Al, and Cr from the UGS were kept in the final powder with the main phase of TiH 1.924 (δ), and minor intermetallic phases of HFe 2 Ti, Ti 5 Si 3 H 0.9 and Cr 1.8 TiH 5.3 . EDS elemental mapping results indicated that HFe 2 Ti and Ti 5 Si 3 H 0.9 intermetallics formed bright phase islands in the matrix. The reduction mechanism and the reaction sequence were discussed based on the thermodynamic modelling with the assistance of HSC chemistry software. The possibility of hydrogen reduction of titanium oxides was discussed as well.
研究领域:
材料科学
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冶金工程
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
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2025
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IF 2
Lifang Yuan,Haoyi Wu,Yahong Jin
Broadband near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) have garnered considerable attention across various fields. Nevertheless, the development of long-wavelength NIR phosphors with high efficiency is still hindered. Herein, chromium-doped olivine-type phosphor LiScSiO 4 via a high-temperature solid-state reaction method is successfully synthesized. Under excitation by 470 nm, the as-obtained phosphor exhibits an ultrabroadband shortwave infrared (SWIR) emission centered at 1190 nm with a full-width at half maximum (FWHM) of 325 nm. The SWIR emission intensity is enhanced by controlling the hydrogen atmosphere, which suppresses the formation of Cr 4+ and promotes the transformation of Cr 4+ into Cr 3+ . The internal quantum efficiency (IQE) and absorption efficiency (AE) of LiScSiO 4 :Cr 3+ reach 73.46% and 46.5%, respectively. The Huang–Rhys factor of 11.4 indicates a strong electron-phonon coupling (EPC) effect, contributing to the large FWHM. Finally, encapsulating the as-obtained SWIR phosphors into a prototype pc–LED yields an SWIR output power of 20.07 mW at a driving current of 950 mA, rendering applications for night vision and online detection of water content in alcohol. Graphical Chromium-doped olivine-type phosphors have been prepared, showing ultrabroadband shortwave infrared (SWIR) emission at 1190 nm with a full-width at half maximum of 325 nm. Hydrogen atmosphere optimization enhances SWIR intensity by promoting Cr 4+ reduction to Cr 3+ . The internal quantum efficiency and absorption efficiency reach 73.46% and 46.5%, respectively, with the thermal stability of 60.9% at 100 °C.
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2017
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IF 5.951
Mei Xiang,Jingna Liu,Wenqian Fu,Tiandi Tang,Dongfang Wu
A hierarchically porous ETS-10-supported highly dispersed Ni catalyst was designed to selectively catalyze the conversion of cellulose to levulinic acid under mild reaction conditions. Full conversion of cellulose and remarkably high yield (91.0%) of levulinic acid are achieved due to the synergistic effect of the unique porous structures and Lewis acid sites in the presence of a hydrogen atmosphere. Moderate Lewis acidic centers of the heterogeneous catalyst are revealed to play a positive role in activating the reaction substrates and intermediates, resulting in prominently catalytic activity. Meanwhile, hierarchical pores centered at 16 nm in ETS-10 benefit the mass transfer and therefore further enhance its catalytic performance. Also, during the process of levulinic acid formation, introduction of hydrogen is responsible for converting cellulose thoroughly and keeping the metal Ni from oxidization by the oxy-compounds, which is distinctive from the widely reported pathway dominated only by cellulose hydrolysis.
研究领域:
催化
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化学工程
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材料科学
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绿色化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）