Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming 650093, PR China.
J Hazard Mater. 2012 Aug 30;229-230:128-36. doi: 10.1016/j.jhazmat.2012.05.084. Epub 2012 Jun 2.
Activated carbon modified with different impregnants has been studied for COS removal efficiency under micro-oxygen conditions. Activated carbon modified with Cu(NO(3))(2)-CoPcS-KOH (denoted as Cu-Co-KW) is found to have markedly enhanced adsorption purification ability. In the adsorption purification process, the reaction temperature, oxygen concentration, and relative humidity of the gas are determined to be three crucial factors. A breakthrough of 43.34 mg COS/g adsorbent at 60°С and 30% relative humidity with 1.0% oxygen is shown in Cu-Co-KW for removing COS. The structures of the activated carbon samples are characterized using nitrogen adsorption, and their surface chemical structures are analyzed with X-ray photoelectron spectroscopy (XPS). Modification of Cu(NO(3))(2)-CoPcS-KOH appears to improve the COS removal capacity significantly, during which, SO(4)(2-) is presumably formed, strongly adsorbed, and present in the micropores ranging from 0.7 to 1.5 nm. TPD is used to identify the products containing sulfur species on the carbon surface, where SO(2) and COS are detected in the effluent gas generated from exhausted Cu-Co-KW (denoted Cu-Co-KWE). According to the current study results, the activated carbon impregnated with Cu(NO(3))(2)-CoPcS-KOH promises a good candidate for COS adsorbent, with the purified gas meeting requirements for desirable chemical feed stocks.
研究了不同浸渍剂改性的活性炭在微氧条件下对 COS 去除效率的影响。研究发现，用 Cu(NO3)2-CoPcS-KOH 改性的活性炭（记为 Cu-Co-KW）具有显著增强的吸附净化能力。在吸附净化过程中，反应温度、氧气浓度和气体的相对湿度被确定为三个关键因素。在 60°C 和 30%相对湿度下，Cu-Co-KW 对 COS 的穿透量为 43.34mg COS/g 吸附剂，氧气浓度为 1.0%。采用氮气吸附对活性炭样品的结构进行了表征，并采用 X 射线光电子能谱（XPS）对其表面化学结构进行了分析。用 Cu(NO3)2-CoPcS-KOH 改性似乎显著提高了 COS 的去除能力，在此过程中，可能形成了 SO4(2-)，并被强烈吸附在 0.7 到 1.5nm 的微孔中。采用 TPD 来鉴定碳表面上含硫物种的产物，在耗尽的 Cu-Co-KW（记为 Cu-Co-KWE）产生的废气中检测到 SO2 和 COS。根据目前的研究结果，用 Cu(NO3)2-CoPcS-KOH 浸渍的活性炭有望成为一种良好的 COS 吸附剂，净化后的气体符合理想化学原料的要求。
