期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
燃煤飞灰氧化汞的机制研究 被引量:4
1
作者 赵永椿 张军营 +3 位作者 刘晶 Mercedes Diaz-Somoano M.Rosa Martinez-Tarazona 郑楚光 《科学通报》 EI CAS CSCD 北大核心 2009年第21期3395-3399,共5页
为深入揭示飞灰与汞的作用机制,采用固定床汞吸附脱附实验系统详细研究了飞灰对汞的吸附氧化作用,尤其是单一气氛下飞灰本身对汞的吸附氧化性能,评价了飞灰中汞的脱附和析出形态,结果表明:飞灰自身对汞有明显的氧化作用,依据飞灰吸附脱... 为深入揭示飞灰与汞的作用机制,采用固定床汞吸附脱附实验系统详细研究了飞灰对汞的吸附氧化作用,尤其是单一气氛下飞灰本身对汞的吸附氧化性能,评价了飞灰中汞的脱附和析出形态,结果表明:飞灰自身对汞有明显的氧化作用,依据飞灰吸附脱附汞形态差异,构建了飞灰与汞作用活性点的分类,提出了3种飞灰氧化汞的反应机制;酸性气体对促进汞氧化、提高飞灰与汞的作用产物的稳定性有重要意义;晶格氧是飞灰氧化汞的重要氧化剂. 展开更多
关键词 飞灰 氧化 吸附脱附 烟气
原文传递
Study on mechanism of mercury oxidation by fly ash from coal combustion 被引量:13
2
作者 ZHAO YongChun ZHANG JunYing +3 位作者 LIU Jing DIAZ-SOMOANO Mercedes MARTINEZ-TARAZONA M. Rosa ZHENG ChuGuang 《Chinese Science Bulletin》 SCIE EI CAS 2010年第2期163-167,共5页
To understand the interaction of fly ash and mercury, systematic experiments on mercury oxidation in single flue gas composition are conducted on a fixed bed reactor system, the desorption rate and speciation of mercu... To understand the interaction of fly ash and mercury, systematic experiments on mercury oxidation in single flue gas composition are conducted on a fixed bed reactor system, the desorption rate and speciation of mercury are valuated. The results indicate that fly ash itself can significantly promote elemental mercury oxidation. A classification of fly ash activated sites is developed according to the speciation of mercury during adsorption-desorption tests, the reaction mechanism of mercury oxidation by fly ash is proposed. Acid gas can promote mercury oxidation and improve the stability of oxidation product. Lattice oxygen is an important oxidant of mercury oxidation. 展开更多
关键词 氧化机制 粉煤灰 煤炭燃烧 反应器系统 氧化反应机理 相互作用 烟气成分
原文传递
Towards full repair of defects in reduced graphene oxide films by two-step graphitization 被引量:11
3
作者 Ruben Rozada Juan I, Paredes Silvia Villar-Rodil Amelia Marlinez-Alonso Juan M. D. Tascon 《Nano Research》 SCIE EI CAS CSCD 2013年第3期216-233,共18页
The complete restoration of a perfect carbon lattice has been a central issue in the research on graphene derived from graphite oxide since this preparation route was first proposed several years ago, but such a goal ... The complete restoration of a perfect carbon lattice has been a central issue in the research on graphene derived from graphite oxide since this preparation route was first proposed several years ago, but such a goal has so far remained elusive. Here, we demonstrate that the highly defective structure of reduced graphene oxide sheets assembled into free-standing, paper-like films can be fully repaired by means of high temperature annealing (graphitization). Characterization of the films by X-ray photoelectron and Raman spectroscopy, X-ray diffraction and scanning tunneling microscopy indicated that the main stages in the transformation of the films were (i) complete removal of oxygen functional groups and generation of atomic vacancies (up to 1,500 ~C), and (ii) vacancy annihilation and coalescence of adjacent overlapping sheets to yield continuous polycrystalline layers (1,800-2,700 ~C) similar to those of highly oriented graphites. The prevailing type of defect in the polycrystalline layers were the grain boundaries separating neighboring domains, which were typically a few hundred nanometers in lateral size, exhibited long-range graphitic order and were virtually free of even atomic-sized defects. The electrical conductivity of the annealed films was as high as 577,000 S-m-1, which is by far the largest value reported to date for any material derived from graphene oxide, and strategies for further improvement without the need to resort to higher annealing temperatures are suggested. Overall, this work opens the prospect of truly achieving a complete restoration of the carbon lattice in graphene oxide materials. 展开更多
关键词 graphene graphene oxide FILMS ANNEALING defect
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部