Conversion of ferrous compounds in a flameless combustion wave of hexogen-based systems filled with iron formate and other additives
作者:Yu. M. Mikhailov、V. V. Aleshin、A. M. Kolesnikova、L. V. Zhemchugova、Yu. V. Maksimov
DOI:10.1007/s11172-017-1841-5
日期:2017.6
and chemical reactions occurring at elevated temperatures in a flameless combustion wave of systems based on hexogen (filled with iron(II) formate and polyisocyanurate binding agent) afford a mixture of ironoxides and iron nitride as nanosized particles. The purposeful change in the ratio of the indicated basis components can provide individual Fe2O3, Fe3O4, or FeO in the conversion products. Additives
Green Approach to Synthesize Multi-Walled Carbon Nanotubes by Using Metal Formate as Catalyst Precursors
作者:Ravindra Rajarao、Badekai Ramachandra Bhat
DOI:10.1166/jnn.2013.7090
日期:2013.3.1
The multi-walled nanotubes (MWNTs) have been synthesized in large scale by using metal formate as catalyst precursors. The calcium carbonate is used as catalyst support, it is chosen because of its non toxic and easily soluble nature. The synthesis was carried out by chemical vapor deposition method for 15 min under optimized conditions. The products were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Raman spectroscopy and X-ray diffraction (XRD) method. The purity of the as grown products and purified products were determined by thermal analysis. The obtained yield of MWNTs was about 8300 wt% relative to the nickel catalyst. This synthesis route avoids the lengthy process of calcination and reduction for the preparation of catalysts hence this method is more economical. This economical and environmental friendly synthesis route can be used for synthesizing MWNTs in large scale.
Investigations into phase formation of LiFe5o8 from decomposed freeze-dried Li-Fe-formates
作者:G. Bonsdorf、H. Langbein、K. Knese
DOI:10.1016/0025-5408(94)00119-7
日期:1995.2
Lithium ferrite (LiFe5O8) was prepared by decomposition of a freeze-driedLi-Fe-formate precursor at unusually low temperatures of 250 °C–700 °C. The phaseformation processes are studied by means of X-ray powder diffraction, IR-spectroscopy, Mo¨ssbauer spectroscopy and magnetic measurements. The decomposition of the Li-Fe-formate at 250 °C produces a spinel phase similar to γ-Fe2O3. Insertion of Li+
铁氧体锂 (LiFe5O8) 是通过冷冻干燥的甲酸锂铁前体在 250°C-700°C 的异常低温下分解制备的。通过 X 射线粉末衍射、红外光谱、穆斯堡尔光谱和磁测量研究了相形成过程。Li-Fe-甲酸盐在 250 °C 下分解产生类似于 γ-Fe2O3 的尖晶石相。Li+ 离子插入 γ-Fe2O3 晶格和阳离子排序过程在 300°C–700°C 的温度范围内进行热处理,中间没有形成 α-Fe2O3。在 700 °C 下获得具有预期磁性能的纯结晶铁氧体锂。
Effects of MN4-Type Coordination Structure in Metallophthalocyanine for Bio-Inspired Oxidative Desulfurization Performance
dibenzothiophene (DBT) in model oil containing n-octane. The results reveal that the conjugate structures and the centermetal ions of metallophthalocyanines played key roles in oxidative desulfurization performance. The inductive effect of different R substituents strongly affected the electron cloud distribution of the conjugate structures and the catalytic performance. Moreover, the catalytic activity of
氧化脱硫(ODS)是一种很有前景的燃料油超深度脱硫新方法。金属-N4-螯合物金属酞菁(MPcs)的氧化脱硫性能与共轭结构和中心金属离子的化学性质有关。在此,由金属酞菁组成的仿生催化系统(MPcR4,M = Mn(II),Fe(II),Co(II),Ni(II),Cu(II),Zn(II); R = -H,-采用COOH、-NO2、-NH2)和分子O2研究金属酞菁中MN4型配位结构对降解含正辛烷模型油中二苯并噻吩(DBT)的影响。结果表明,金属酞菁的共轭结构和中心金属离子在氧化脱硫性能中起关键作用。不同R取代基的诱导效应强烈影响共轭结构的电子云分布和催化性能。此外,与 d 电子构型和配体场效应有关的 MPcs 的催化活性不会随着中心金属离子 d 电子数的增加而依次增加。
Synthesis of porous coordination polymers using carbon dioxide as a direct source