Abstract

A study is made of the effect of the composition of the active component of copper-doped nickel catalysts on their activity and selectivity in the hydrodeoxygenation (HDO) of model compounds of vegetable oils (esters) to remove oxygen atoms from them with the formation of alkanes. It is shown that the Ni/Al₂O₃ and Ni–Cu/Al₂O₃ catalysts are active in this process. With them, the hydrodeoxygenation of methyl ester of hexadecanoic acid mixed with ethyl ester of decanoic acid results in the formation of С₆−С₁₆ alkanes and oxygen-containing products, while methane and ethane can be found in the gas phase. When the Ni : Cu ratio in the catalysts is lowered, the conversion of esters and the capability of these catalysts for C–C bond hydrogenolysis are reduced. This means the introduction of copper can promote retention of the carbon skeleton of alkanes obtained as a result of hydrodeoxygenation, along with the amount of methane. According to X-ray diffraction data, introducing copper into the Ni/Al₂O₃ catalyst results in the formation of Ni_1 – xCu_x solid solutions. According to X-ray photoelectron spectroscopy data, lowering the content of copper in the Ni–Cu/Al₂O₃ catalyst raises the Ni : Cu ratio on a sample’s surface.

中文翻译：

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研究铜助催化酯加氢处理过程中Ni / Al 2 O 3催化剂活性的影响

摘要

研究了掺杂铜的镍催化剂的活性成分的组成对其在植物油（酯）模型化合物加氢脱氧（HDO）中从中除去氧原子并形成四氢呋喃的活性和选择性的影响。烷烃。结果表明，Ni / Al ₂ O ₃和Ni-Cu / Al ₂ O ₃催化剂在此过程中具有活性。有了它们，十六烷酸在С的形成用的癸酸结果酸乙酯混合的甲基酯的加氢脱氧₆ -С ₁₆烷烃和含氧产物，而甲烷和乙烷则存在于气相中。当降低催化剂中Ni：Cu的比例时，酯的转化率和这些催化剂进行C-C键氢解的能力就会降低。这意味着引入铜可以促进由于加氢脱氧而获得的烷烃的碳骨架以及甲烷的量。根据X射线衍射数据，将铜引入Ni / Al ₂ O ₃催化剂可形成Ni _{1 –  x} Cu _x固溶体。根据X射线光电子能谱数据，降低了Ni-Cu / Al ₂ O _3中的铜含量 催化剂提高了样品表面的Ni：Cu比。