State Key Laboratory of Coal Science and Technology, Co-founded by Shanxi Province and the Ministry of Science and Technology, Institute for Chemical Engineering of Coal, Taiyuan University of Technology, West Yingze Street Number 79, Taiyuan 030024, People's Republic of China.
Environ Sci Technol. 2013 May 7;47(9):4859-65. doi: 10.1021/es304791b. Epub 2013 Apr 11.
A series of iron oxide sorbents with novel structures of three-dimensionally ordered macropores (3DOM), ranging in size from 60 to 550 nm, were fabricated and creatively used as sorbents for the removal of H2S at medium temperatures of 300-350 °C. Evaluation tests using thermogravimetric analysis (TGA) and a fixed-bed reactor showed that, in comparison to the iron oxide sorbent prepared by a conventional mixing method, the fabricated iron oxide sorbent with a 3DOM structure exhibited much higher reactivity and efficiency, as well as high sorbent utilization with low regeneration temperature. The excellent performance of 3DOM iron oxide as a sulfur sorbent is attributed to its special texture, i.e., the open and interconnected macroporous, large surface area, and nanoparticles of iron oxide, which are revealed by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), and nitrogen adsorption techniques. The investigation results of the pore effect on the performance of the sorbent show that sorbents with pores size around 150 nm in diameter revealed the best performance. The reason is that pores of this size are large enough to allow gas to pass through even if the channel is partially blocked during the reaction process while remaining a large surface area that can provide more active sites for the reaction.
一系列具有三维有序大孔（3DOM）新颖结构的氧化铁吸附剂被制备出来，并被创造性地用作中温（300-350°C）下去除 H2S 的吸附剂。使用热重分析（TGA）和固定床反应器进行的评估测试表明，与通过常规混合方法制备的氧化铁吸附剂相比，具有 3DOM 结构的氧化铁吸附剂具有更高的反应性和效率，以及更低的再生温度下的高吸附剂利用率。3DOM 氧化铁作为硫吸附剂的优异性能归因于其特殊的结构，即开放且相互连接的大孔、大表面积和氧化铁纳米颗粒，这通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线衍射（XRD）和氮气吸附技术得以揭示。对孔效应对吸附剂性能影响的研究结果表明，直径约为 150nm 的孔的吸附剂表现出最佳性能。原因是这种尺寸的孔足够大，即使在反应过程中通道部分堵塞，气体也可以通过，同时保持较大的表面积，为反应提供更多的活性位点。
