枝状纤维纳米二氧化硅负载的锌基吸附剂增强热煤气脱硫:结构设计和金属改性

IF 11.3 1区 环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL
Xinwei Duan , Jie Mi , Qiaochun Li , Jiancheng Wang , Junjie Liao , Mengmeng Wu
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引用次数: 0

摘要

设计适合热煤气脱硫的吸附剂载体仍然是一项具有挑战性的任务。本研究采用微乳液法制备了具有中心径向孔结构的树突状纤维纳米二氧化硅(DFNS)载体,并对其形成机理进行了探讨。通过调节DFNS合成过程中的乳液相行为,可以对DFNS的平均粒径和平均表面皱纹间距进行定向控制。然后在这些DFNS载体上构建了一系列介孔锌基脱硫剂。结果表明,所提出的孔隙斜率参数与脱硫剂的破硫容量有良好的正相关关系。该载体的活化能(20.5 kJ/mol)明显低于前人报道的脱硫剂的活化能。此外,通过金属(Sm/Mo/Ni)改性,dfns负载型吸附剂的脱硫性能可进一步提高1.27% ~ 34.6%。当Ni/Zn摩尔比为1/5时,吸附剂的突破硫容量最高,为15.85 g S/100 g。此外,优化后的吸附剂在多次硫化/再生循环中表现出良好的稳定性,突出了其在热煤气脱硫方面的应用潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Dendritic fibrous nanosilica supported Zn-based sorbents towards enhanced hot-coal-gas desulfurization: Structural design and metal modification

Dendritic fibrous nanosilica supported Zn-based sorbents towards enhanced hot-coal-gas desulfurization: Structural design and metal modification
Designing suitable carriers of sorbents for hot-coal-gas desulfurization is still a challenging task so far. In this study, dendritic fibrous nanosilica (DFNS) carriers with central radial pore structures were synthesized via microemulsion method, and the formation mechanism was proposed. The mean particle diameter (MPD) and mean surface wrinkle spacing (MSWS) of DFNS could be directionally controlled by regulating the emulsion phase behavior during DFNS synthesis. A series of mesoporous Zn-based desulfurizers were then constructed based on these DFNS carriers. The results indicate that the proposed parameter, pore slope, could be well positively correlated with the breakthrough sulfur capacity of desulfurizers. The activation energy (20.5 kJ/mol) of sorbent with the optimized carrier is significantly lower than that of previously reported desulfurizers. Additionally, the desulfurization performance of DFNS-supported sorbents could be further improved by 1.27 %-34.6 % by metal (Sm/Mo/Ni) modification. Sorbents with Ni/Zn molar ratio of 1/5 exhibit the highest breakthrough sulfur capacity of 15.85 g S/100 g sorbents. Moreover, the optimized sorbent demonstrated good stability over multiple sulfidation/regeneration cycles, highlighting its potential for hot-coal-gas desulfurization applications.
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来源期刊
Journal of Hazardous Materials
Journal of Hazardous Materials 工程技术-工程:环境
CiteScore
25.40
自引率
5.90%
发文量
3059
审稿时长
58 days
期刊介绍: The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.
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