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The molar volume of FeO–MgO–Fe2O3– Cr2O3–Al2O3–TiO2 spinels
FeO–MgO–Fe2O3– Cr2O3–Al2O3–TiO2 publicly available
2012/4/8
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X-ray Fluorescence Analysis of Cr6+ Component in Mixtures of Cr2O3 and K2CrO4
X-ray Fluorescence Analysis Cr6+ Component in Mixtures of Cr2O3 and K2CrO4
2010/1/1
X-ray fluorescence analysis using Cr Kα spectra was applied to the determination of the mixing ratio of Cr6+ to (Cr6+ + Cr3+) in several mixtures of K2CrO4 and Cr2O3. Because the powder of K2CrO4 cont...
分别采用柠檬酸络合法和直接分解法制备了Cr2O3催化剂, 采用XRD, BET, TPR, XPS, TEM和TGA表征了催化剂的物理化学性质, 在常压固定床石英管(内径5 mm)反应器中考察了Cr2O3催化剂对甲烷部分氧化反应的催化性能. 在500~750 ℃, V(CH4)∶V(O2)=2, 空速12×104 h-1的条件下, O2几乎完全转化, CH4转化率及H2和CO选择性随着温度的升高而...
以十六烷基三甲基溴化铵为表面活性剂(CTAB)，乙酰丙酮铬为铬源，于180℃下用水热法合成了αCr2O3纳米棒。用TGDSC及红外对中间体乙酰丙酮铬进行了表征。通过XRD衍射分析，表明产物Cr2O3为α相六方晶型结构。扫描电镜观察到纳米棒的直径约为70～80nm，长度约为0.5～1.2μm。DTA数据表明，Cr2O3纳米棒对RDX的热分解具有催化作用。经退火处理的Cr2O3纳米棒能有效促进RD...
采用共沉淀法制备了一系列Cr2O3-ZnO催化剂用于甲醇水汽重整制氢. 用XRD和BET表征考察了Cr含量及焙烧温度对Cr2O3-ZnO催化剂物相结构的影响, 并用不锈钢的微通道反应器考察了催化剂的反应性能. 结果表明, ZnO是催化剂主要的活性组分, Cr的加入明显提高了催化剂的活性和稳定性, 尽管催化剂的比表面积有所降低. CO选择性随Cr含量的增加而升高. 当焙烧温度在500 ℃左右, Cr...