| 1 | Glycerol steam reforming over hydrothermal synthetic Ni-Ca/attapulgite for green hydrogen generation显示文摘Glycerol steam reforming(GSR)is one of the promising technologies that can realize renewable hydrogen production and efficient utilization of crude glycerol.To illuminate the functions of Ca content(3%,6%,9%,and 12%,by mass)and preparation method for Ni/ATP catalyst structure and its catalytic behaviors,the Ni-xCa/ATP(x=3%,6%,9%,and 12%,by mass)catalysts are prepared by co-impregnation(ci)and hydrothermal synthesis(hs)method and then tested in GSR.Characterization results of XRD,N_(2) adsorption–desorption,H_(2)-TPR,HRTEM,XPS,and NH_(3)/CO_(2)-TPD demonstrate that the combined effect between appropriate Ca additive(6%,by mass)and hs enhance catalyst reducibility,uniform distribution of Ca additive and nickel species over ATP,and adsorption for CO_(2).This attributes to hs method protects the ATP framework through suppressing the interaction of Ca with ATP and promotes the formation of NiCaOx interface sites.Therefore,Ni-6Ca/ATP-hs exhibits the highest conversion(86.77%)of glycerol to gas product and H_(2) yield(76.17%)and selectivity(58.56%)during GSR.Furthermore,XRD,HRTEM,TGDTG and Raman analyses confirm that Ni-6Ca/ATP-hs also reveals outstanding anti-sintering and coke resistance.In addition,the structural evolution process of Ni/ATP catalyst with Ca introduction and hs method is presented.Considering the high performance,simple preparation process and low cost,the as-prepared catalyst providing new opportunities for utilization of glycerol derived from biodiesel industry. | Yishuang Wang Na Li Mingqiang Chen Defang Liang Chang Li Quan Liu Zhonglian Yang Jun Wang | 2022 | Chinese Journal of Chemical Engineering2022，35，8： | 0 |
| 2 | Reduced Annealing Time and Enhanced Magnetocaloric Effect of La(Fe,Al)13 Alloy by La-nonstoichiometry and Si-doping显示文摘LaFe13-x Mx(M=Si,Al)alloys are promising for use in magnetic refrigeration.However,they require long annealing time(30 days)in order to optimize the magnetocaloric properties.Research has shown that the addition of extra La in off-stoichiometric alloys can greatly shorten the annealing time.Therefore,the purpose of this study is to investigate the influence of the extra addition of La on the annealing properties of a new off-stoichiometric La1.7Fe11.6Al1.4-xSix(x=0,0.1,0.4)alloys.It was demonstrated that after a 36 h annealing time,a large volume fraction of 1:13 magnetocaloric phase was obtained for all alloys.Further microstructural analysis of the off-stoichiometric La1.7Fe11.6Al1.4-xSix alloys revealed a facet-like grain morphology.The La1.7Fe11.6Al1.4 and La1.7Fe11.6Al1Si0.4 alloys were shown to contain large 1:13 phase precipitates separated in a La-rich matrix,while the La1.7Fe11.6Al1.3Si0.1 alloy had a continuous 1:13 phase matrix with a fine dispersion of La-rich precipitates throughout.When the magnetic field varied between 0 and 2 T,the corresponding magnetic entropy change and relative cooling capacity for the La1.7Fe11.6Al1.3Si0.1 specimen were determined as 4.58 J/kg K and 173.6 J/kg,respectively.More importantly,the La1.7Fe11.6Al1.3Si0.1 alloy displayed only a slight volume change when the meta-magnetic phase transition occurred,which is promising for cyclic use. | Liang Yang Jun Li Defang Tu Joel C.J.Strickland Qiaodan Hu Hongbiao Dong Jianguo Li | 2020 | Acta Metallurgica Sinica(English Letters)2020，33，11： | 0 |
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