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131.
Round C. I. Williams C. D. Duke C. V. A. 《Journal of Thermal Analysis and Calorimetry》1998,54(3):901-911
Pure silica zeolite ZSM-5 has been synthesised in a slightly acidic aqueous fluoride medium which produces the protonated
form of the zeolite ZSM-5 [1]. Tetrahalometallate [2] species of cobalt and manganese have been synthesised and increasing
mole fractions incorporated into the zeolite synthesis gel. The products have been analysed and characterised using simultaneous
thermogravimetric-derivative thermogravimetric analysis (TG-DTG). The thermal decomposition, under nitrogen of the associated
tetraethylammonium (TEA+) and tetrapropylammonium (TPA+) cations occluded within the zeolite channels is indicative and characteristic of the incorporation of the heteroatoms into
the zeolitic framework. Analysis by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray fluorescence (XRF),
and Fourier transform infrared spectroscopy (FTIR) has confirmed the reliability of thermogravimetric (TG) and derived thermogravimetric
analysis (DTG) as a diagnostic tool.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
132.
A one-dimensional double-chain coordination polymer [Mn(phen)(tsgluo)] was synthesized in a mixed solution and its crystal structure was determined by X-ray diffraction method. It crystallizes in orthorhombic system with space group P212121. The crystal data are: a=0.530 78(17) nm, b=1.723 9(5) nm, c=2.456 9(8) nm, Z=4, μ=0.729 mm-1, Dc=1.579 g·cm-3, V=2.248 1(12) nm3, R1=0.033 1, ωR2=0.078 9. In the title complex, each Mn(Ⅱ) ion presents a octahedral geometry with the coordination of two nitrogen atoms from 1,10-phenanthroline and four oxygen atoms from three different tsgluo2- ligands. The γ-carboxyl coordinates to Mn(Ⅱ) in the mode of bidentate chelate, while the α-carboxyl coordinates in a bidentate bridging mode. CCDC: 253910. 相似文献
133.
锂离子电池负极合金CoSn和Cu-Sn的制备与表征 总被引:9,自引:0,他引:9
CoSn alloy and Cu-Sn samples were synthesized by H2-reduction following solid-state reaction between Co(Ⅱ), Cu(Ⅱ), Sn(Ⅳ) and NaOH at ambient temperature. The samples were characterized by XRD, SEM. The results showed that CoSn alloy (80~200nm) is globe-shaped, ultrafine hexagonal material, and Cu-Sn alloy powder consists of two phases, i.e. Cu6Sn5 and Cu3Sn. Cu-Sn powder has spherical morphology and the particle size is estimated to be 60~70nm. The electrochemical performances of CoSn alloy and Cu-Sn powder were studied using lithium-ions model cell Li/LiPF6 (EC+DMC)/CoSn (or Cu-Sn). It was demonstrated the reversible discharge capacities for 10 cycles keep above 280mAh·g-1 for nanophase Cu-Sn, and 60mAh·g-1 for CoSn alloy. Differ-ential capacity plots showed that the reaction mechanisms of Cu-Sn with lithium were reversible. 相似文献
134.
Fe-Mn, Co-Mn and Ni-Mn composite oxide catalysts based on high specific surface area MnO2 precursor were prepared and applied to catalytic combustion of CH4. Results were compared with that of unmodified MnOx and 1wt.% Pd/-Al2O3. Below 450°C, manganese oxide catalysts show higher activity than Pd/-Al2O3, while the modified manganese oxide catalysts exhibit higher activity than the unmodified one below 420°C. All catalysts were characterized by means of N2-BET, XRD, TG-DTA and H2-TPR. Due to the interaction between Fe, Co or Ni oxides and manganese oxide, the activity of the oxygen species of the modified catalysts is improved, which leads to the increase of their CH4 combustion activity. 相似文献
135.
LIN Jun-Fan YAN Ya-XieDepartment of ChemistryInstitute of Chemistry Chemical EngineeringNanjing UniversityNanjing Jiangsu 《天然气化学杂志》1995,(2)
A series of perovskite type oxides La_(1-x)A_(x)MnO_3(x=0.1 for A=Li,Na,K;x=0.1~0.5 for A=Li)have been prepared by impregnation.Experimental results showed that the substitution of La~(3 ) by Li~ inLaMnO_(3 ?) greatly increased the selectivity to ethane and ethylene for theoxidative coupling of methane.Temperature-programmed desorption of oxygenproved the presence of oxygen vacancies in the oxide lattice.The higher Mn~(4 )/Mn_t ratio in oxide made the formation of oxygen vacancies easier on the oxidesurface.The general formula of the oxides is La_(1-x)Li_(x)Mn'V'_(y)O_(3-y),V=vacancy. 相似文献
136.
137.
N,N-二甲基甲酰胺中电沉积制备镁镍储氢合金 总被引:1,自引:0,他引:1
采用恒电位沉积法, 选用适宜的添加剂和络合剂, 成功地从N,N-二甲基甲酰胺(DMF)中沉积出致密的黑色Mg-Ni储氢合金膜. 并初步探讨了其共沉积机理. XRD显示沉积层中含有非晶态Mg-Ni相和微晶态Mg相. SEM图及相应能谱图分析表明合金颗粒以团聚状态存在, 合金成分不是很均匀. AAS分析表明沉积合金中Mg的原子摩尔分数达27.3%. LAND电池测试系统测得所镀合金膜的放电比容量最高为172.4 mAh/g. 相似文献
138.
2A12-T6铝合金表面双-(γ-三乙氧基硅丙基)四硫化物薄膜的特性 总被引:2,自引:0,他引:2
采用傅立叶变换红外光谱分析了2A12-T6铝合金表面自组装双-(!-三乙氧基硅丙基)四硫化物硅烷偶联剂(SCA)薄膜结构特征,并采用电化学极化曲线评价了薄膜的耐蚀性能.结果表明,铝材表面自然晾干,SCA薄膜分子之间主要通过氢键连接,腐蚀电流密度减小1个数量级以上.120℃的加热处理促进铝板表面通过SiOSi链接而形成SCA网状薄膜结构,并通过在界面上形成SiOAl界面相结构而与铝板表面牢固连接,腐蚀电流密度降低2个数量级以上.SCA乙醇溶液浸泡处理10min比浸泡2s~1min的铝板表面SCA薄膜内氢键缔合羟基要多. 相似文献
139.
140.
粉末化学镀法制备的NiB/TiO2非晶态合金催化剂对环丁烯砜加氢反应的催化性能 总被引:7,自引:0,他引:7
采用诱导沉积法及粉末化学镀法分别制备了纯态NiB及负载型NiB/TiO2非晶态合金催化剂.用XRD,ICP,SEM,TEM和DSC等手段对催化剂的物性及TiO2载体与NiB非晶态合金之间的相互作用进行了表征,考察了非晶态合金的结构、组成、形貌和热稳定性,并将其用于环丁烯砜加氢反应中.结果表明,相对于NiB而言,NiB/TiO2催化剂具有优良的热稳定性和催化活性,这缘于NiB和TiO2载体之间的相互作用及载体的分散作用. 相似文献