A preliminary Raman spectroscopic perspective for the roles of catalysts during char gasification

Hui-Ling Tay; Shiro Kajitani; Shuai Wang; Chun-Zhu Li

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A preliminary Raman spectroscopic perspective for the roles of catalysts during char gasification

机译：拉曼光谱学初步观点，探讨了焦炭气化过程中催化剂的作用

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How a catalyst would speed up gasification is fundamentally important for the development of efficient gasification technologies. It is particularly crucial for the efficient use of catalytic species inherently present in low-rank coal and biomass. This study aims to gain insights about the catalytic gasification reaction mechanisms through tracing the changes in char structure during gasification with FT-Raman spectros-copy. A Victorian brown coal was acid-washed to remove its inherent alkali and alkaline earth metallic species. The raw coal and the acid-washed coal were independently subjected to gasification at 800 ℃ under different gasifying conditions (with oxidising and/or reducing atmosphere). Our FT-Raman results revealed that, regardless of the coal type, oxygenation that occurred during char gasification could increase the gasification rate. In addition, catalyst was shown to enhance the gasification rate by participating in the reaction between the char matrix and the radicals derived from the gasifying agents. The presence of a catalyst has made the gasification process to be less selective, due to both reduced selective consumption of char and reduced chance/time for ring condensation.

机译：催化剂如何加速气化对于开发高效气化技术至关重要。对于有效利用低阶煤和生物质中固有的催化物质，这尤其重要。这项研究旨在通过利用FT-拉曼光谱技术追踪气化过程中炭结构的变化来获得有关催化气化反应机理的见识。酸洗维多利亚女王时代的褐煤以去除其固有的碱金属和碱土金属物种。原煤和酸洗后的煤分别在800℃，不同的气化条件下（在氧化和/或还原气氛下）进行气化。我们的FT-拉曼光谱结果表明，无论煤种如何，在焦炭气化过程中发生的氧化作用都可以提高气化率。另外，显示出催化剂通过参与炭基质与衍生自气化剂的自由基之间的反应来提高气化速率。由于减少了焦炭的选择性消耗和减少了环缩合的机会/时间，催化剂的存在使气化过程的选择性降低。

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来源
《Fuel》 |2014年第4期|165-172|共8页
作者
Hui-Ling Tay; Shiro Kajitani; Shuai Wang; Chun-Zhu Li;
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作者单位

Fuels and Energy Technology Institute, Curtin University of Technology, CPO Box U1987, Perth, WA 6845, Australia;

Fuels and Energy Technology Institute, Curtin University of Technology, CPO Box U1987, Perth, WA 6845, Australia;

Fuels and Energy Technology Institute, Curtin University of Technology, CPO Box U1987, Perth, WA 6845, Australia;

Fuels and Energy Technology Institute, Curtin University of Technology, CPO Box U1987, Perth, WA 6845, Australia;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Coal; Gasification; Catalyst; Char structure; FT-Raman spectroscopy;

机译：煤;气化;催化剂;字符结构;FT-拉曼光谱;

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1. Volatilisation and catalytic effects of alkali and alkaline earth metallic species during the pyrolysis and gasification of Victorian brown coal. Part VII, Raman spectroscopic study on the changes in char structure during the catalytic gasification i [J] . X. Li, J.-i. Hayashi, C.-Z. Li Fuel . 2006,第10a11期

机译：维多利亚褐煤热解和气化过程中碱金属和碱土金属物质的挥发和催化作用。第七部分，拉曼光谱研究催化气化过程中炭结构的变化
2. An X-ray photoelectron spectroscopic perspective for the evolution of O-containing structures in char during gasification [J] . Wang Shuai, Wu Liping, Hu Xun, Fuel Processing Technology . 2018,第期

机译：一种X射线光电子能谱，用于气化过程中含有O型结构的演化
3. Effect of catalyst on coal char structure and its role in catalytic coal gasification [J] . Zhang Jiali, Zhang Rong, Bi Jicheng Catalysis Communications . 2016,第Null期

机译：催化剂对煤焦结构的影响及其在催化煤气化中的作用
4. PRELIMINARY STUDY ON PYROLYSIS CHAR GASIFICATION USING A BUBBLING FLUIDIZED BED GASIFIER [C] . R. Moreira, A. Portugal, N. Gil-Lalaguna, European biomass conference and exhibition;ETA-Florence Renewable Energies . 2015

机译：鼓泡流化床气化炉热解焦炭的初步研究
5. TRUE IN SITU OIL SHALE RETORT: THE ROLE OF INTRASHALE TRANSPORT AND CHAR GASIFICATION [D] . LOUVAR, JOSEPH FRANCIS 1983

机译：原位油页岩蒸煮的真实情况：页岩内运输和焦炭气化作用
6. Mesoporous Acidic Catalysts Synthesis from Dual-Stage and Rising Co-Current Gasification Char: Application for FAME Production from Waste Cooking Oil [O] . Junaid Ahmad, Umer Rashid, Francesco Patuzzi, 2020

机译：双级和并流气化焦炭合成中孔酸性催化剂：在废食用油生产FAME中的应用
7. This article presents a new numerical model describing the behaviour of a thermally thick wood sample exposed to high solar heat flux (above 1 MW/m2). A preliminary study based on dimensionless numbers is used to classify the problem and support model building assumptions. Then, a model based on mass, momentum and energy balance equations is proposed. These equations are coupled with liquid-vapour drying model and pseudo species biomass degradation model. By comparing to a former experimental study, preliminary results have shown that these equations are not enough to accurately predict biomass behaviour under high solar heat flux. Indeed, a char layer acting as radiative shield forms on the sample exposed surface. In addition to this classical set of equations, it is mandatory to take into account radiation penetration into the medium. Furthermore, as biomass contains water, medium deformation consecutively to char steam gasification must also be implemented. Finally, with the addition of these two strategies, the model is able to properly capture the degradation of biomass when exposed to high radiative heat flux over a range of sample initial moisture content. Additional insights of biomass behaviour under high solar heat flux were also derived. Drying, pyrolysis and gasification fronts are present at the same time inside of the sample. The coexistence of these three thermochemical fronts leads to char gasification by the steam produced from drying of the sample, which it is the main phenomenon behind medium ablation. [O] . Pozzobon, Victor, Salvador, Sylvain, Bézian, Jean Jacques 2018

机译：本文提供了一个新的数值模型，该模型描述了暴露于高太阳热通量（高于1 / MW / m2）的热厚木材样品的行为。基于无量纲数的初步研究用于对问题进行分类并支持模型构建假设。然后，提出了一种基于质量，动量和能量平衡方程的模型。这些方程式与液体蒸汽干燥模型和假物种生物质降解模型耦合。通过与以前的实验研究进行比较，初步结果表明，这些方程不足以准确预测高太阳热通量下的生物量行为。的确，在样品暴露的表面上形成了充当辐射屏蔽层的炭层。除了这套经典的方程式之外，还必须考虑到辐射向介质的渗透。此外，由于生物质中含有水，因此还必须在炭蒸气汽化后进行连续的介质变形。最后，通过添加这两种策略，该模型能够在一定范围的样品初始水分含量下暴露于高辐射热通量的情况下，正确捕获生物质的降解。还得出了在高太阳热通量下生物量行为的其他见解。样品内部同时存在干燥，热解和气化前沿。这三个热化学前沿的共存会导致样品干燥产生的蒸汽产生焦炭气化，这是介质烧蚀的主要现象。
8. Coal Char Gasification Using Alkali Metal Catalysts. [R] . veraa, m. j. bell, a. t. 1977

机译：碱金属催化剂煤焦气化。

A preliminary Raman spectroscopic perspective for the roles of catalysts during char gasification

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