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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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棕榈壳焦co2气化过程中反应性及结构特性研究
, PP. 947-954
Keywords: 棕榈壳,气化焦,co2气化,反应活性
Abstract:
？850℃下,利用管式炉制备了不同转化率的棕榈壳co2气化焦,通过热重分析仪研究了气化焦的co2气化反应性,采用比表面积分析、拉曼光谱、x射线荧光光谱和扫描电镜-能谱等分析手段,考察了气化焦孔隙结构、碳组成、矿物元素含量与分布随转化率的变化。结果表明,在co2气化过程中,随着转化率的提高,棕榈壳气化焦固定碳的含量逐渐降低,有序化碳的相对含量为0.30~0.33,对气化过程起到一定的抑制作用;灰分含量逐渐增加,但气化反应指数rs呈现先降低后升高的过程。转化率小于23%时,rs与气化焦比表面积的变化趋势一致;23%<转化率<31%时,rs基本不变;31%<转化率<68%时,比表面积随转化率线性增加,rs取决于孔隙比表面积、矿物元素催化2个因素的协同作用,当转化率>56%时,该催化作用变得明显,同时碳的有序化程度开始降低;转化率>68%时,rs主要受矿物元素的催化作用控制。
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