Influence of reaction conditions on one-step hydrotreatment of lipids in the production of iso-alkanes over Pt/SAPO-11

A one-step hydrotreatment of soybean oil to produce iso-alkanes has been carried out over a Pt/SAPO-11 catalyst in a fixed-bed reactor. The influence of reaction conditions such as temperature, pressure, hydrogen/oil ratio, and space velocity on the catalytic performance has been investigated. From the levels of intermediate products, gas products (CO, CO2) and the target product (alkane), it was found that the hydrogenolysis of esters, fatty acids and fatty aldehydes and the formation of fatty alcohols were prohibited, which led to high selectivity for hydrodecarboxylation and hydrodecarbonylation at high temperature, low pressure or low hydrogen/oil ratio. The selectivity of the isomerization increased when temperature increased or space velocity decreased, while pressure and hydrogen/oil ratio were found to have no influence. A plausible reaction pathway has been proposed based on these results.

摘要在固定床反应器中, 以大豆油为模型原料, 研究了反应温度/压力/氢油比和空速等条件对Pt/SAPO-11催化油脂一步加氢制异构烷烃反应的影响, 并分析了反应中间产物/气体产物(CO, CO2)及烷烃终产物的变化趋势. 结果表明, 高温/低压或低氢油比可抑制酯/羧酸和醛的氢解以及醇的生成, 促进油脂脱氧选择性地向脱羧和脱羰方向进行; 异构烷烃收率随温度升高或空速减小而先增加后下降, 但反应压力和氢油比的影响不大. 另外, 对油脂一步加氢过程可能的反应历程进行了讨论.

Graphical AbstractThe influence of reaction conditions on the pathway of lipid deoxygenation and alkane isomerization over a Pt/SAPO-11 catalyst have been investigated. A plausible reaction route is discussed based on the results.Figure optionsDownload as PowerPoint slide