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化学吸附方法表征V₂O₅在活性焦上的分散性

Distribution of V₂O₅ on activated cokes measured by chemical adsorption

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【Author】 XIAO Yong1,2,LIU Zhen-yu1,3,LIU Qing-ya3,XING Xin-yan1,2,WANG Jian-cheng1,2(1.State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan 030001,China;2.Graduate School of the Chinese Academy of Sciences,Beijing 100039,China;3.State Key Laboratory of Chemical Resource Engineering,Beijing University of Chemical Technology,Beijing 100029,China)

【机构】中国科学院山西煤炭化学研究所煤转化国家重点实验室；北京化工大学化工资源有效利用国家重点实验室；中国科学院山西煤炭化学研究所煤转化国家重点实验室山西太原030001；中国科学院研究生院；北京100039；山西太原030001；北京100029；

【摘要】 V2O5在活性焦上的分散性很难用XRD、EXAFS等仪器表征。采用化学吸附法表征了V2O5在活性焦表面的团聚程度,核心是根据V2O5/AC中能吸附、氧化SO2的V2O5晶格氧(有效晶格氧)的量,度量V2O5分子的团聚程度。结果表明,在所采用的条件范围内,随V2O5负载量的增加,V2O5在活性焦表面的团聚程度加大,但团聚体的个数变化不大;活性焦比表面积、灰分含量、O和N含量的差异对V2O5的团聚程度没有影响。更多还原

【Abstract】 Distribution of V2O5 on activated coke(AC) can not be characterized by common techniques such as X-ray diffraction(XRD) analysis and EXAFS,etc.In this article,chemical absorption of SO2 on V2O5/ACs is used to elucidate V2O5 distribution.The aggregation of V2O5 is calculated through the amount of lattice oxygen in V2O5 responsible for SO2 adsorption and oxidation.Results show that,under the conditions used,the aggregation degree of V2O5 increases with V2O5 loading,but the number of aggregates change a little.Differences in AC′s surface area,ash,O,and N contents show little influence on V2O5 distribution.更多还原