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采用浸渍法制备出3种MgO负载型过渡金属催化剂Fe/MgO、Co/MgO和Ni/MgO,系统研究了甲醇在3种催化剂上于600℃下的裂解产物。结果表明,3种催化剂均能催化甲醇裂解产生富氢气体,同时产生碳纳米管。其中,Ni/MgO具有最佳的催化效果。 相似文献
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在90℃下,采用空气氧化法于弱碱性介质中氧化Mn2+制备Mn3O4。X-射线衍射和扫描电镜表明,产物为四方结构的Mn3O4,纯度高、结晶良好,具有近似球形形貌。电化学测试结果表明,在50 mA/g的电流密度下,Mn3O4作为阳极材料的初始放电容量为198 mA.h/g。在不同电流密度下循环50次后,放电容量基本可以回到初始值。 相似文献
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N,N'-二四唑胺和邻菲啰啉与碱土金属钙、锶混配配合物的合成与表征 总被引:1,自引:1,他引:1
以N,N’-二四唑胺(C2H3N9)和邻菲哕啉(C12H8N2)为配体合成碱土金属Ca,Sr的含能配合物,并对配合物进行了基础的物化表征。化学分析和元素分析确定配合物的组成为Ca(C2HN9)(C12H8N2):(H2O)。(1)和Sr(C2HN9)(C12H8N2)2(H2O)2(2)。溶解性实验表明,常温下配合物难溶于水加热时溶解,且不溶于甲醇、乙腈等有机溶剂。红外光谱分析表明,配体邻菲啰啉以双齿螯合形式与中心离子配位,配体N,N’-二四唑胺中N原子参与了配位。TG—DTG热分析显示配合物在氮气气氛、研究温度范围内有三个热分解过程,最终分解产物可能分别为以CaO与SrO为主的混合物。 相似文献
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室温下合成了6种未见报道的固态含能配合物M(BTA)(bpy)m.nH2O(M=Mn,m=1,n=1;M=Co,m=2,n=5;M=Ni,m=2,n=6;M=Cu,m=2,n=0;M=Zn,m=2,n=1;M=Pb,m=1,n=0;BTA=N,N’-二四唑胺离子,bpy=2,2’-联吡啶),对它们进行了组成、红外光谱、密度等表征。测定了298.15 K下各配合物的液相生成反应焓变△rHmθ,改变液相反应温度,在实验和计算基础上,得到了液相生成反应的热力学参数(活化焓△Hθ≠、活化熵△S≠θ和活化自由能△Gθ≠)、速率常数k和动力学参数(表现活化能E、频率因子ln[A/s]和反应级数n)。 相似文献
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Thermochemistry of Ternary Complex Dy(Et_2dtc)_3(phen) 总被引:1,自引:0,他引:1
The ternary solid complex was synthesized with sodium diethyldithiocarbamate (NaEt2dtc), 1,10-phenanthroline (phen) and low hydrated dysprosium chloride in absolute ethanol by improved method of reference. The title complex was identified as the general formula of Dy(Et2dtc)3(phen) by chemical and elemental analyses. IR spectrum of the complex shows that the Dy3 coordinated with six sulfur atoms of three NaEt2dtc and two nitrogen atoms of phen. It is assumed that the coordination number of Dy3 is eight.The enthalpy change of liquid-phase reaction of formation, ΔrHθm(l), is determined as (-19.091±0.015) kJ·mol-1 at 298.15 K by a microcalorimeter, and the enthalpy change of the solid-phase reaction of formation, ΔrHθm(s), is calculated as (139.641±0.482) kJ·mol-1 on the basis of a thermochemical cycle. The thermodynamic of reaction of formation was studied by changing the temperature of liquid-phase reaction. The constant-volume combustion energy of the complex, ΔcU, is determined as (-16730.21±9.25) kJ·mol-1 by a precise rotating-bomb calorimeter at 298.15 K. Its standard enthalpies of combustion, ΔcHθm, and standard enthalpies of formation, ΔfHθm, are calculated as (-16749.42±9.25) kJ·mol-1 and (-2019.68±10.19) kJ·mol-1, respectively. 相似文献
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Thermochemistry on Coordination Behavior of Neodymium Chloride Hydrate with Diethylammonium Diethyldithiocarbamate 总被引:1,自引:0,他引:1
The complex of neodymium chloride lower hydrate with diethylammonium diethyldithiocarbamate (D-DDC) was synthesized conveniently in absolute alcohol and dry N2 atmosphere. The title complex was identified as Et2NH2 [ Nd(S2CNEt2)4] by chemical and elemental analyses and the bonding characteristics of which was characterized by IR. The enthalpies of solution of neodymium chloride hydrate and D-DDC in absolute alcohol at 298.15 K and the enthalpies change of liquid-phase reaction of formation for Et2NH2[ Nd (S2CNEt2)4] at different temperatures were determined by microealorimetry. On the basis of experimental and calculated results, three thermodynamic parameters (the activation enthalpy, the activation entropy and the activation free energy), the rate constant and three kinetic parameters (the apparent activation energy, the pre-exponential constant and the reaction order) of liquid-phase reaction of formation were obtained.The enthalpy change of the solid-phase title reaction at 298.15 K was calculated by a thermochemical cycle. 相似文献
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二氧化锰的制备及其对高氯酸铵和黑索金的催化性能 总被引:1,自引:0,他引:1
以KMn O4为锰源、CO(NH2)2为还原剂,在90℃水热条件下通过氧化还原反应制备Mn O2。采用X-射线衍射、扫描电镜和红外光谱等技术对所得产物进行表征。利用差示扫描量热技术研究了Mn O2对高氯酸铵(AP)和黑索金(RDX)热分解行为的影响,进行了热分解动力学分析,并探讨了二元体系的相容性。结果表明,Mn O2的添加使AP的分解过程提前,但对RDX的分解峰温影响很小。 相似文献