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首页> 外文期刊>Journal of industrial and engineering chemistry >Fe/olivine as primary catalyst in the biomass steam gasification in a fountain confined spouted bed reactor
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Fe/olivine as primary catalyst in the biomass steam gasification in a fountain confined spouted bed reactor

机译：Fe / olivine作为初级催化剂在灌注器中的生物质蒸汽气化中狭窄的喷射床反应器

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The performance of Fe/olivine catalysts was tested in the continuous steam gasification of sawdust in a bench scale plant provided with a fountain confined conical spouted bed reactor at 850 degrees C. Olivine was used as catalyst support and loaded with 5 wt%Fe. The activity and stability of the catalyst was monitored by nitrogen adsorption-desorption, X-ray fluorescence spectroscopy, temperature programmed reduction, X-ray diffraction and X-ray photoelectron spectroscopy techniques, which were conducted before and after the runs. The fountain confined conical spouted bed performs well in the biomass steam gasification with primary catalysts. In fact, this reactor allows enhancing the gas-solid contact, and therefore the catalytic activity by avoiding the elutriation of fine catalyst particles. The uncatalysed efficiency of the gasification process, assessed based on the gas production and composition, H-2 production, tar concentration and composition, and carbon conversion efficiency, was consideraby improved on the Fe/olivine catalyst, with tar reduction being especially remarkable (to 10.4 g Nm(-3)). After 140 min on stream, catalyst deactivation was particularly evident, as tar concentration increased to 19.9 g Nm(-3) (90% of that without catalyst). However, Fe/olivine catalyst was still active for WGS and CH4 steam reforming reactions, with gas and H-2 productions being 1.35 Nm(3) kg(-1) and 5.44 wt%, respectively. Metal iron oxidation to Fe3O4 caused catalyst deactivation, as the reaction environment shifted from oxidizing to reducing conditions due to operational limitations. (C) 2021 The Author(s). Published by Elsevier B.V. on behalf of The Korean Society of Industrial and Engineering Chemistry.
机译：在配备喷泉约束锥形喷动床反应器的实验室规模装置中，在850°C温度下，对锯木屑连续水蒸气气化中的Fe/橄榄石催化剂的性能进行了测试。橄榄石用作催化剂载体，负载了5 wt%的Fe。在运行前后，通过氮气吸附-脱附、X射线荧光光谱、程序升温还原、X射线衍射和X射线光电子能谱技术监测催化剂的活性和稳定性。喷泉约束锥形喷动床在一级催化剂的生物质水蒸气气化中表现良好。事实上，该反应器可以通过避免催化剂细颗粒的淘析来增强气固接触，从而提高催化活性。通过改进铁/橄榄石催化剂，可根据气体产量和组成、H-2产量、焦油浓度和组成以及碳转化效率评估气化过程的非催化效率，其中焦油减少尤其显著（至10.4 g Nm（-3））。运行140分钟后，催化剂失活尤其明显，因为焦油浓度增加到19.9 g Nm（-3）（90%不含催化剂）。然而，对于WGS和CH4蒸汽重整反应，Fe/橄榄石催化剂仍具有活性，气体和H-2产物分别为1.35 Nm（3）kg（-1）和5.44 wt%。由于操作限制，金属铁氧化为Fe3O4导致催化剂失活，因为反应环境从氧化转变为还原条件。（c）2021作者。由爱思唯尔B.V.代表韩国工业和工程化学学会出版。

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