Determination of active sites during gasification of biomass char with CO_2 using temperature-programmed desorption. Part 2: Influence of ash components

Rincon Prat Sonia; Schneider Christoph; Kolb Thomas

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Determination of active sites during gasification of biomass char with CO_2 using temperature-programmed desorption. Part 2: Influence of ash components

机译：使用温度编程解吸在CO_2与CO_2气化过程中活性位点的测定。第2部分：灰分成分的影响

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The present work is the second part of a study conducted with the aim to determine the amount of active sites present on the surface of a biomass char participating in the gasification reaction with CO2 using the temperature programmed desorption (TPD) technique. In part 1, the methodology and experimental results during TPD of partially gasified samples of beech wood char (WC1600) using CO2 as gasification agent are presented. This work focusses on the influence of the main inorganic ash components of WC1600 on the CO2 and CO signals obtained during TPD of partially gasified char samples. Furthermore, an activated carbon with ash content lower than 1 wt-% is impregnated with Ca and K and partially gasified followed by a TPD analysis. CO2 and CO signals obtained during TPD result from decomposition of oxygenated surface complexes and decomposition reactions of ash components. During gasification, three different kinds of sites are present on the surface of the char: stable, reactive and catalytically active sites. The latter are a measure of the catalytic influence of inorganic matter during char gasification. From the analysis of the TPD spectra, it can be concluded that gasification of WC1600 is dominated by the catalytic influence exerted by Ca and K. Formation of oxygenated surface complexes on WC1600 is limited, possibly due to the high temperature at which the sample was pyrolyzed (1600 degrees C). However, a direct correlation between specific conversion rate and the amount of reactive and catalytically active sites is developed from the experimental results, corrected by the contribution of ash decomposition.

机译：目前的作品是研究的第二部分，其目的是使用温度编程的解吸（TPD）技术来确定参与与CO2的生物量焦化表面的活性位点的量。在第1部分中，介绍了使用CO2作为气化剂的山毛榉木炭（WC1600）部分气化样品的方法和实验结果。这项工作侧重于WC1600主要无机灰分成分对部分气化焦炭样品TPD在TPD中获得的CO2和CO信号的影响。此外，具有低于1wt-％的灰分含量的活性炭浸渍有Ca和K并部分气化，然后进行TPD分析。在TPD期间获得的CO 2和CO信号由含氧表面复合物的分解和灰分成分的分解反应产生。在气化过程中，焦炭表面存在三种不同类型的部位：稳定，反应性和催化活性位点。后者是炭气化期间无机物质催化作用的衡量标准。从TPD光谱的分析中，可以得出结论，WC1600的气化是由Ca和K的催化作用主导。WC1600上的含氧表面配合物的形成是有限的，可能是由于样品热解的高温，可能是由于样品热解的高温（1600℃）。然而，特定转化率与反应性和催化活性位点的量之间的直接相关性由实验结果产生，通过灰分分解的贡献来校正。

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来源
《Fuel》 |2020年第may1期|117179.1-117179.11|共11页
作者
Rincon Prat Sonia; Schneider Christoph; Kolb Thomas;
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作者单位

Univ Nacl Colombia Dept Ingn Mecan & Mecatron BIOT Grp Invest Biomasa & Optimizac Term Proc Carrera 30 45A-03 Bogota Colombia;

Karlsruhe Inst Technol Engler Bunte Inst EBI Ceb Fuel Technol Engler Bunte Ring 3 D-76131 Karlsruhe Germany;

Karlsruhe Inst Technol Engler Bunte Inst EBI Ceb Fuel Technol Engler Bunte Ring 3 D-76131 Karlsruhe Germany|Karlsruhe Inst Technol Inst Tech Chem ITC Vgt Hermann von Helmholtz Pl 1 D-76344 Eggenstein Leopoldshafen Germany;

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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
Biomass char; Gasification kinetics; Surface chemistry; Temperature-programmed desorption; Active sites; Inorganic ash components; Catalytically active sites;

机译：生物量炭;气化动力学;表面化学;温度编程的解吸;活性位点;无机灰分成分;催化活性位点;

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专利

1. Determination of active sites during gasification of biomass char with CO_2 using temperature-programmed desorption. Part 1: Methodology & desorption spectra [J] . Schneider Christoph, Prat Sonia Rincon, Kolb Thomas Fuel . 2020,第May1期

机译：使用温度编程解吸在CO_2与CO_2气化过程中活性位点的测定。第1部分：方法论和解吸光谱
2. A Quantitative Evaluation of Active Site Number for CO2 Gasification of Various Coal Chars by Temperature-Programmed Desorption Method [J] . Midori Yumiyama, Nobutsune Takezawa, Senji Honma, Journal of Chemical Engineering of Japan . 1990,第4期

机译：程序升温脱附法定量评价各种煤焦CO2气化活性位点
3. Ash of palm empty fruit bunch as a natural catalyst for promoting the CO_2 gasification reactivity of biomass char [J] . Lahijani P., Zainal Z.A., Mohamed A.R., Bioresource Technology: Biomass, Bioenergy, Biowastes, Conversion Technologies, Biotransformations, Production Technologies . 2013,第Null期

机译：棕榈空果束灰作为天然催化剂，可促进生物质炭的CO_2气化反应
4. Study on Kinetics of Char Gasification with CO_2 and Steam by the method of Shared Active Sites [C] . Wei Huo, Zhijie Zhou, Yifei Wang, Thirty-First annual International Pittsburgh Coal Conference . 2014

机译：活性位点共享法研究CO_2和蒸汽焦炭气化动力学
5. Studies on reactivity and porosity development in chars, and the carbon - carbon dioxide reaction via temperature-programmed desorption. [D] . Zhang, Linghong. 1996

机译：研究炭的反应性和孔隙率，以及通过程序升温脱附进行的碳-二氧化碳反应。
6. Valorization of Char From Biomass Gasification as Catalyst Support in Dry Reforming of Methane [O] . Vittoria Benedetti, Snehesh Shivananda Ail, Francesco Patuzzi, 1970

机译：生物质气化中焦炭的重整作为甲烷干重整中的催化剂载体
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。

Determination of active sites during gasification of biomass char with CO_2 using temperature-programmed desorption. Part 2: Influence of ash components

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