The two-step hydrodeoxygenation of pine sawdust pyrolysis oil, or bio-oil, is performed using pairs of first-step hydrotreating and second-step hydrodeoxygenating catalysts. The reaction results demonstrate that the combination of hydrotreating carbon-supported 5 wt% Pd (5 wt% Pd/C) and hydrodeoxygenating tungstate-zirconia-supported 3 wt% Ru (3 wt% Ru/WZr) catalysts produced the highest yield of oil products and the lowest yield of cokes and tars. The hydrodeoxygenated liquid products are further analyzed using FT-IR, which indicates the removal of carbonyls and hydroxyls along with an increase of methyls. The roles of hydrotreating Pd/C are further studied using GC/MS results of the hydrotreated liquid products; these results indicate that the hydrogenation of carbonyls to alcohols and the saturation of furans occur during the first step of the hydrotreating process. The removal of carbonyls and unsaturated furans can suppress their strong adsorption to noble metal surfaces and then their carbonization to cokes.

松木屑热解油或生物油的两步加氢脱氧是使用一对第一步加氢处理和第二步加氢脱氧催化剂进行的。反应结果表明，加氢处理碳负载的5 wt％Pd（5 wt％Pd / C）和加氢脱氧钨酸锆负载的3 wt％Ru（3 wt％Ru / WZr）催化剂的组合可产生最高的油收率。产品和最低的焦炭和焦油收率。使用FT-IR进一步分析了加氢脱氧的液体产物，这表明羰基和羟基的去除以及甲基的增加。使用加氢处理的液体产品的GC / MS结果进一步研究了加氢处理Pd / C的作用。这些结果表明在加氢处理过程的第一步中发生了羰基加氢成醇和呋喃饱和的现象。羰基和不饱和呋喃的去除可以抑制它们对贵金属表面的强烈吸附，然后抑制其碳化成焦炭。