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采用不同硅铝比的HZSM-5催化剂,在不同条件下(超临界、亚超临界、非超临界乙醇)催化提质生物油中的高沸点组分(HBF),应用磷核磁共振(31P-NMR)定量检测了提质前后生物油中醇、酚和羧酸类羟基的质量比(羟基质量/生物油质量)变化,研究和评价了催化剂和超临界条件对生物油催化提质的效果.研究表明,超临界条件有利于生物油中脂肪族羟基的转化,但是不利于非缩合羟基的转化;使用不同酸强度的HZSM-5都能使生物油中的羧基完全转化,增加催化剂的酸强度可以促进脂肪族羟基的转化,而只有酸性较弱的催化剂才能顺利转化非缩合酚羟基.
HZSM-5 catalyst with different Si / Al ratio was used to improve the high boiling point component (HBF) of bio-oil under different conditions (supercritical, supercritical and non-supercritical ethanol) NMR) were used to quantitatively detect the mass ratio of hydroxyl groups (hydroxyl group / bio-oil) of alcohols, phenols and carboxylic acids in the bio-oil before and after the upgrading. The catalytic and supercritical conditions on the bio-oil catalytic quality were studied and evaluated. The results show that the supercritical conditions are conducive to the conversion of aliphatic hydroxyl groups in the bio-oil, but not conducive to the conversion of non-condensed hydroxyl groups; the use of HZSM-5 with different acid strength can completely convert the carboxyl groups in the bio-oil and increase the acid strength of the catalyst Can promote the conversion of aliphatic hydroxyl, and only the less acidic catalyst can successfully convert non-condensed phenolic hydroxyl.