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      2. Ni-Mg/RHA催化劑水蒸氣重整焦油模型化合物研究
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        華中農業大學工學院

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        公益性行業(農業)科研專項經費項目:秸稈熱裂解高值炭氣聯產技術與裝備研究,項目編號:201503135-11


        Study on Ni-Mg/RHA catalyst steam reforming tar model compound
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          摘要:

          以生物質燃燒產物稻殼灰為載體,采用共浸漬法制備Ni-Mg/RHA催化劑。以甲苯為生物質焦油模型化合物,研究了Ni-Mg/RHA催化劑對甲苯水蒸氣催化重整的性能。在固定床反應裝置中考察了Ni和Mg的負載量、反應溫度和水/碳比對甲苯轉化率和氣體產物組分的影響,采用XRD、BET、SEM等方法對反應前后催化劑進行表征分析。結果表明,RHA作為單金屬Ni基催化劑的載體具有一定的催化活性;負載MgO后,與NiO相互結合形成NiMgO固溶體活性中心,顯著提升了Ni/RHA催化劑的催化活性和抗積炭能力,Mg負載量為6 wt%時性能最佳,甲苯轉化率高達98.6%;3Ni-6Mg/RHA的催化劑的最佳反應溫度為700℃,S/C為3,具有良好催化穩定性。本文證明了在MgO存在的情況下稻殼灰作為鎳基催化劑載體的可行性。

          Abstract:

          Biomass combustion product rice husk ash was selected as the carrier, and Ni-Mg/RHA catalyst was prepared by co-impregnation method. The catalytic performance of Ni-Mg/RHA for steam reforming of toluene was studied using toluene as a model compound of biomass tar. The effects of Ni and Mg loadings, reaction temperature and S/C ratio on toluene conversion and gas product composition were investigated in a fixed-bed reactor. The catalysts before and after reaction were characterized by XRD, BET and SEM.The experimental results show that RHA as a support of single metal Ni-based catalyst has a certain catalytic activity;The activity and resistance to carbon deposition of Ni/RHA catalyst were significantly improve by that formation of NiMgO solid solution active center after the loading of MgO, and the catalytic activity and the resistance to carbon deposition of Ni/RHA catalyst were optimal when the Mg loading amount was 6wt%, and the toluene conversion was as high as 98.6%;The optimum reaction temperature of 3Ni-6Mg/RHA is 700 ℃, S/C is 3, and the catalyst has good catalytic stability. The feasibility of using rice husk ash as the support of nickel-based catalyst in the presence of MgO was proved.

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        • 收稿日期:2020-04-28
        • 最后修改日期:2020-05-23
        • 錄用日期:2020-05-25
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