Upgrading of liquid fuel from the vacuum pyrolysis of biomass over the Mo–Ni/γ-Al2O3 catalysts
Upgrading of liquid fuel from the vacuum pyrolysis of biomass over the Mo–Ni/γ-Al2O3 catalysts
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DOI：
10.1016/j.biombioe.2009.03.002
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发表时间：
2009-08
影响因子：
6
通讯作者：
Ying Xu;Tiejun Wang;Longlong Ma;Qi Zhang;Lu Wang
中科院分区：
文献类型：
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作者：
Ying Xu;Tiejun Wang;Longlong Ma;Qi Zhang;Lu Wang
生物油中大量的酸性化合物不仅具有腐蚀性和高酸性等有害特性，而且也为其广泛应用设置了诸多障碍。在温和条件下对生物油进行加氢处理，部分羧酸类化合物可转化为醇类化合物，与生物油中未转化的酸类发生酯化反应生成酯类化合物。该方法可改善生物油的性能。以松木木屑为原料，采用真空热解法制备生物油。研究了最佳生产条件。制备了一系列镍基催化剂。通过对模型化合物（冰醋酸）的改造，评价了它们的催化活性。结果表明，还原后的Mo-10Ni /γ- al2o3催化剂活性最高，乙酸转化率为33.2%。研究了还原性Mo-10Ni /γ- al2o3催化剂对生物油的提质作用。经过升级处理后，生物油的pH值由2.16提高到2.84。水分含量从46.2wt增加。%至58.99%。生物油中H元素含量从6.61wt增加。%至6.93 %。动态粘度略有下降。气相色谱-质谱分析结果表明，升级后的生物油中酯类化合物含量增加了3倍。对生物油中的羧基化合物进行加氢和酯化处理，可以改善生物油的性能。
High amounts of acid compounds in bio-oil not only lead to the deleterious properties such as corrosiveness and high acidity, but also set up many obstacles to its wide applications. By hydrotreating the bio-oil under mild conditions, some carboxylic acid compounds could be converted to alcohols which would esterify with the unconverted acids in the bio-oil to produce esters. The properties of the bio-oil could be improved by this method. In the paper, the raw bio-oil was produced by vacuum pyrolysis of pine sawdust. The optimal production conditions were investigated. A series of nickel-based catalysts were prepared. Their catalytic activities were evaluated by upgrading of model compound (glacial acetic acid). Results showed that the reduced Mo–10Ni/γ-Al2O3catalyst had the highest activity with the acetic acid conversion of 33.2%. Upgrading of the raw bio-oil was investigated over reduced Mo–10Ni/γ-Al2O3catalyst. After the upgrading process, the pH value of the bio-oil increased from 2.16 to 2.84. The water content increased from 46.2wt.% to 58.99wt.%. The H element content in the bio-oil increased from 6.61wt.% to 6.93wt.%. The dynamic viscosity decreased a little. The results of GC–MS spectrometry analysis showed that the ester compounds in the upgraded bio-oil increased by 3 times. It is possible to improve the properties of bio-oil by hydrotreating and esterifying carboxyl group compounds in the bio-oil.