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Pd@C3N4 nanocatalyst for highly efficient hydrogen storage system based on potassium bicarbonate/formate 下载免费PDF全文
Xianzhao Shao Jinming Xu Yanqiang Huang Xiong Su Hongmin Duan Xiaodong Wang Tao Zhang 《American Institute of Chemical Engineers》2016,62(7):2410-2418
Formate/bicarbonate system has several desirable properties such as noncorrosive and nonirritating nature, as well as facile handling, which make it an attractive candidate for a safe, reversible hydrogen storage material. Herein, Pd nanoparticles supported on mesoporous graphitic carbon nitride (mpg‐C3N4) for formate‐based reversible hydrogen storage is reported. The as‐developed Pd/mpg‐C3N4 material was shown to be a superior catalyst for the hydrogenation of high concentrations of bicarbonate to formate under mild conditions. The effects of reaction temperature, H2 pressure, and bicarbonate concentration on the hydrogenation of bicarbonate to formate were investigated. The catalytic performance remained steady with high activity up to six hydrogenation cycles. The interaction between mpg‐C3N4 and Pd nanoparticles and the concerted effects of the nitrogen species located at mpg‐C3N4 and bicarbonate played a synergetic role in the enhancement of the performance of the catalyst for hydrogenation. © 2016 American Institute of Chemical Engineers AIChE J, 62: 2410–2418, 2016 相似文献
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Sajid Ali Yue Jiang Zhirong Lai Peipei Zhang Songshou Ye Jiexiang Wang Jile Fu Nuowei Zhang Jinbao Zheng Binghui Chen 《中国稀土学报(英文版)》2023,41(8):1179-1188
CeO2 plays an important role in heterogeneous catalysis,and its performance is highly dependent on the oxygen vacancies and surface defects,which can be easily tuned by manipulating the particle dimensions and morphology.In this article,we report a facile strategy to synthesize a new type of CeO2 with modified surface property which can improve its ability to active oxygen.The obtained ball-type 3D selfassemble CeO2(M-CeO2) is composed of large amounts... 相似文献
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《International Journal of Hydrogen Energy》2019,44(39):21406-21412
Sub/supercritical water liquefication (SCWL) is a water-based thermochemical technology as well as an environmentally friendly treatment by converting wet feedstock into bioenergy. In the present study, a systematic investigation of SCWL of lignite was carried out covering a temperature range between 320 and 440 °C when residence time increased from 5 min to 40 min. The highest bio-oil oil yield of 34.3% with solid residue of 52.7% was obtained at 440 °C for 5 min. Phenol derivatives, carboxylic acids, long chain hydrocarbons, ketones, and naphthalene were the main bio-oil composition through FTIR and GC-MS analysis. Gas yields and their exact compositions were also determined and CO2 was the dominate gas product but the percentage of CH4 became significant at severe SCWL conditions. A conclusion was drawn that fast liquefaction (e.g. 5 min) at relative higher temperature (e.g. 400 °C) which avoid excessive gasification and repolymerization reactions was an optimization strategy for high yield bio-oil production from SCWL of lignite. 相似文献
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Bing Zhou Quanli Ke Meijun Wen Tianbiao Ying Guokai Cui Ying Zhou Zhenyu Gu Hanfeng Lu 《中国稀土学报(英文版)》2023,41(8):1171-1178
CeO2,La2O3,and CeO2-Y2O3 oxides were coated on the surface of spherical granular AI2O3(3-5 mm)through impregnation method,and proved as better supports of Pd and Pt catalysts.The influences of rare earth metal doping on the adsorption rates of Pd and Pt ions,as well as the catalytic performance,were investigated.Results show that the H2PtCl6·6H2O adsorption rates of the Al 相似文献
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《International Journal of Hydrogen Energy》2019,44(42):23589-23599
Novel composite photocatalysts consisting of a cadmium and zinc sulfide solid solution (Cd0.6Zn0.4S) and zinc sulfide (ZnS) nanoparticles were successfully prepared by a simple hydrothermal treatment of suspended Cd0.3Zn0.7S at 120 °C. The as-obtained materials were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, and UV-VIS diffuse reflection spectroscopy. The obtained photocatalysts were tested in the photocatalytic evolution of hydrogen from a Na2S/Na2SO3 aqueous solution under visible light irradiation (λ = 450 nm). It is shown that the hydrothermal treatment of Cd0.3Zn0.7S at 120 °C increases the activity by a factor of 7.5 due to the phase transformations of the solid solution with the formation of the multiphase Cd0.6Zn0.4S/ZnS sample. The deposition of gold on the surface of Cd0.6Zn0.4S/ZnS leads to a further increase in activity: the achieved photocatalytic activity and quantum efficiency (450 nm) for 1%Au/Cd0.6Zn0.4S/ZnS are 17.4 mmol g−1 h−1 and 42.6%, respectively. This excellent performance is found to be attributable to the transformation of Cd1-xZnxS from the cubic to the hexagonal phase during the hydrothermal treatment. Additionally, photoelectrodes based on Cd0.6Zn0.4S/ZnS and FTO were synthesized and tested in a two-electrode cell. A high value of the photocurrent equal to 0.5 mA/cm2 is achieved for the Cd0.6Zn0.4S/ZnS/FTO electrode. An investigation by means of impedance spectroscopy reveals the longer lifetime of photogenerated charge carriers in the Cd0.6Zn0.4S/ZnS/FTO photoelectrode if to compare with Cd0.3Zn0.7S/FTO system. 相似文献
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《International Journal of Hydrogen Energy》2020,45(16):9783-9794
Natural Egyptian bentonite clay intercalated with both La and Ni having different molar ratio (La: Ni = 2:1, 1:1 & 1:2) were prepared, saving 5mmole pillar/gm clay, using ultrasonic assistance method. The prepared catalysts were calcined at 450 and then reduced at 400 °C & 600 °C.Characterization of the prepared LaNi-PILC was achieved by X-ray diffraction (XRD), Furrier transform infrared spectroscopy (FTIR), N2 adsorption desorption isotherm (BET) and H2-temperature programmed reduction (H2-TPR). The data confirm the success of intercalation process for both La & Ni in the lamellar structure of bentonite clay. The La: Ni molar ratio affected the specific surface area, Ni crystal size, dispersion and reducibility of the prepared catalyst. The reduction temperature had a great effect on the reactivity and product selectivity during CO2/CH4 reforming at different reaction temperatures (600–800 °C). Where, reduction at 400 °C gives rise to CH4 oxidation reaction (MOR) with formaldehyde as a main product. While reduction at 600 °C enhances the activity and stability for CO2 reforming of methane (CRM) and syngas production (H2/CO ~ 1.19). The most active and stable LaNi1:2-PILC5 catalyst (CO2 and CH4 conversions reached 85% and 90% respectively) is superior with respect to the performance of PILC based catalysts reported in the literatures. 相似文献
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《Materials Letters》2005,59(24-25):3112-3114
One-dimensional microstructures of orthorhombic molybdenum trioxide (α-MoO3) have been synthesized via acidification of ammonium heptamolybdate tetrahydrate. A solution of precursor compound, ammonium heptamolybdate tetrahydrate, is acidified to pH 3.5 using diluted glacial acetic acid. Then the intermediate compound is sintered at 300 and 600 °C to give the final α-MoO3, and the SEM shows that it still keeps its micrometer fibers structure. 相似文献
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M.Monisha M.S.Murari Dalal Abdullah Aloraini Aljawhara H.Almuqrin M.I.Sayyed Karunakara Naregundi Sudha D.Kamath 《中国稀土学报(英文版)》2023,41(8):1144-1152
Sm3+ ions incorporated Sm2Si2O7 crystalline phase formed in the aluminoborosilicate glass matrix synthesized via melting quenching technique followed by heat-treatment process is reported herewith.The preliminary confirmation on the obtained glass ceramics was made through X-ray diffration(XRD) studies.Formation of non-bridging oxygens(NBOs) in the glass network and the modes of vibrations of network units we re analyzed through Fourier transform infra... 相似文献
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