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Kinetics and Mechanism of oxidation Induced Contraction of mgal2o4 spinel Carbon Composites Reinforced by Al4C3 in situ Reaction

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Journal of Wuhan University of Technology(Materials Science) 2020年第4期35卷 778-785页

作者： YANG Mengyao XIAo Guoqing YANG Ding'ao YUAN Shouqian ZAo Jizeng ZHAo Wei GAo Song ollege of Materials Science and Engineering Xi'an University of Architecture and TechnologyXi'an 710055China Beijing LierHigh-Temperature Materials Co. Ltd.Beijing 102211China Luoyang Lier Refractories Co. Ltd.Luoyang 471023China

Kinetics and mechanism of oxidation induced contraction of mgal2o4 spinel carbon composites reinforced by Al4C3 in situ reaction were researched in air using vertical high temperature thermal dilatometer from 25℃to 1400℃.It is shown that oxidation induced contraction of mgal2o4 spinel carbon composites reinforced Al4C3 in situ reaction is the common logarithm of oxidation time t and the oxygen partial pressure P inside mgal2o4 spinel carbon composites reinforced by Al4C3 in situ reaction in air at 1400℃is as follows:P=F(-2.75×10^-4A+2.13×10^-3)*** nonsteady diffusion kinetic equation of o2 at 1400℃inside the composites is as follows:J=De *** of the total diffusional?flux of oxygen inside the composites at 1400℃is in inverse proportion to the oxidation *** nonsteady state effective diffusion coefficient De of o2(g)inside the composites decreases in direct proportional to the increase of the amount of metallic *** method of preventing the oxidation induced contraction of mgal2o4 spinel carbon composites reinforced by Al4C3 in situ reaction is to increase the amount of *** slag erosion index of Mgo-Al2o3 spinel carbon composite reinforced by Al4C3 in situ reaction is 0.47 times that of Mgo-Cao brick used in the lining above slag line area of a VoD stainless steel-making *** of Mgo-Al2o3 spinel carbon composite reinforced by Al4C3 in situ reaction is 26.7 MPa,HMoR of the composite is 3.6 times the same as that of Mgo-Cao brick used in the lining above slag line area of a VoD *** service life is two times as many as that of Mgo-Cao brick.

关键词： kinetics mechanism oxidation contraction mgal2o4 spinel carbon Al4C3 in situ reaction

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Effect of the degree of dispersion of Pt over mgal_2o_4 on the catalytic hydrogenation of benzaldehyde

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Chinese Journal of Catalysis 2017年第9期38卷 1613-1620页

作者： Feng Yan Caixian Zhao Lanhua Yi Jingcai Zhang Binghui Ge Tao Zhang Weizhen Li Key Laboratory of Environmentally Friendly Chemistry and Applications of Ministry of Education School of Chemistry Xiangtan University Xiangtan 411105 Hunan China State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 Liaoning China Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China

one of the central tasks in the field of heterogeneous catalysis is to establish structure‐function relationships for these catalysts,especially for precious metals dispersed on the sub‐nanometer ***,we report the preparation of mgal2o4‐supported Pt nanoparticles,amorphous aggregates and single atoms,and evaluate their ability to catalyze the hydrogenation of *** Pt species were characterized by N2adsorption,X‐ray diffraction(XRD),aberration‐corrected transmission electron microscopy(ACTEM),Co chemisorption and in situ Fourier transform infrared spectroscopy of the chemisorbed Co,as well as by inductively coupled plasma atomic emission *** existed as isolated or neighboring single atoms on the mgal2o4support,and formed amorphous Pt aggregates and then nanocrystallites with increased Pt *** the mgal2o4support,single Pt atoms were highly active in the selective catalytic hydrogenation of benzaldehyde to benzyl *** terrace atoms of the Pt particles were more active but less selective;this was presumably due to their ability to form bridged carbonyl *** mgal2o4‐supported single‐atom Pt catalyst is a novel catalyst with a high precious atom efficiency and excellent catalytic hydrogenation ability and selectivity.

关键词： Platinum mgal2o4 spinel Single‐atom catalyst Selective hydrogenation Benzaldehyde Benzyl alcohol

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