One‐step Modification of Active Sites and Support in Ni/Al2O3 Catalyst for Hydrodeoxygenation of Lignin‐derived Diphenyl Ether,ChemistrySelect

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One‐step Modification of Active Sites and Support in Ni/Al2O3 Catalyst for Hydrodeoxygenation of Lignin‐derived Diphenyl Ether
ChemistrySelect ( IF 1.9 ) Pub Date : 2018-11-02 , DOI: 10.1002/slct.201802490
Kaixuan Yang ₁ , Xiao Chen ₁ , Gwendoline Lafaye ₂ , Catherine Especel ₂ , Florence Epron ₂ , Changhai Liang ₁

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A bifunctional Ni₂Si/SiO₂‐Al₂O₃ catalyst was prepared by one‐step chemical vapor deposition (CVD), and used for hydrode‐oxygenation (HDO) of diphenyl ether (DPE). During the one‐step CVD process, metallic Ni species as the HDO active sites were isolated by intermetallic modification of Si atoms and partial electron transferred from Ni to Si, as inferred by XRD, XPS, and theoretical calculation. Furthermore, the characterization results revealed that the acidity and structure of Al₂O₃ were tuned due to the formation of Al‐O−Si bonds. Consequently, compared with Ni/Al₂O₃ catalyst, the Ni₂Si/SiO₂‐Al₂O₃ catalyst showed a higher benzene selectivity (60% vs 47%), O‐free products selectivity at the similar conversion of DPE, and high stability for the HDO of DPE. This work provides insight for design of bifunctional catalysts with specific catalytic properties by one‐step CVD method.

中文翻译：

木质素衍生的二苯醚加氢脱氧的Ni / Al2O3催化剂中活性位和载体的一步改性

通过一步化学气相沉积（CVD）制备了双功能Ni ₂ Si / SiO ₂ -Al ₂ O ₃催化剂，并将其用于二苯醚（DPE）的加氢脱氧（HDO）。在一步法CVD过程中，通过X射线衍射，XPS和理论计算推断出，通过对Si原子进行金属间修饰以及部分电子从Ni转移到Si中，可以分离出作为HDO活性位点的金属Ni类。此外，表征结果表明，由于形成了Al-O-Si键，因此可以调节Al ₂ O ₃的酸度和结构。因此，与Ni / Al ₂ O ₃催化剂相比，Ni ₂ Si / SiO ₂‐Al ₂ O ₃催化剂显示出较高的苯选择性（60％比47％），在类似DPE转化率下无O的产品选择性以及对DPE HDO的高稳定性。这项工作为通过一步CVD方法设计具有特定催化性能的双功能催化剂提供了见识。

更新日期：2018-11-02

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