Tan Yewen, Sun Zhenkun, Cabello Arturo, Lu Dennis Y, Hughes Robin W
Natural Resources Canada, CanmetENERGY-Ottawa, 1 Haanel Drive, Ottawa, Ontario K1A 1M1, Canada.
ACS Omega. 2020 Apr 23;5(17):9674-9683. doi: 10.1021/acsomega.9b03853. eCollection 2020 May 5.
The reactivity of ilmenite as an oxygen carrier (OC) in the presence of HS was studied. A simulated syngas (66% CO, 34% H) was used as the fuel. HS concentrations were set to 4700 and 6580 ppm. The effect of the presence of CO was also investigated. The experiments were carried out using a thermogravimetric analyzer (TGA) at atmospheric pressure, with temperatures varying from 1073 to 1223 K. The results showed that the presence of HS had no effect on the reduction kinetics of ilmenite. With the presence of only CO in the syngas, deposition on ilmenite samples was not observed. In the presence of HS, deposition was observed regardless of the presence of CO. Higher HS concentration led to more pronounced deposition. It was shown that deposition only occurred after the ilmenite sample was sufficiently reduced. For ilmenite oxidation, the mass change curves display a distinct peak followed by a valley when the sample was previously reduced in the presence of HS, indicating reactions between the sulfur deposit and air. The amount of the sulfur deposit could be calculated using the oxidation curves. Scanning electron microscope-energy dispersive X-ray (SEM-EDX) and X-ray diffraction (XRD) analyses were conducted to examine the surface of the reduced samples and the results from these analyses confirmed the presence of the sulfur deposit on the surface of the samples that were reduced in HS-containing atmospheres.
研究了钛铁矿在存在HS的情况下作为氧载体（OC）的反应活性。使用模拟合成气（66%CO，34%H）作为燃料。HS浓度设定为4700和6580ppm。还研究了CO存在的影响。实验在常压下使用热重分析仪（TGA）进行，温度范围为1073至1223K。结果表明，HS的存在对钛铁矿的还原动力学没有影响。当合成气中仅存在CO时，未观察到在钛铁矿样品上有沉积。在存在HS的情况下，无论是否存在CO，均观察到有沉积。较高的HS浓度导致更明显的沉积。结果表明，沉积仅在钛铁矿样品充分还原后发生。对于钛铁矿氧化，当样品先前在HS存在下被还原时，质量变化曲线显示出一个明显的峰值，随后是一个谷值，表明硫沉积物与空气之间发生了反应。硫沉积物的量可以使用氧化曲线来计算。进行了扫描电子显微镜-能量色散X射线（SEM-EDX）和X射线衍射（XRD）分析，以检查还原样品的表面，这些分析结果证实了在含HS气氛中还原的样品表面存在硫沉积物。
