Highly efficient alloyed NiCu/Nb2O5 catalyst for the hydrodeoxygenation of biofuel precursors into liquid alkanes,Catalysis Science & Technology

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Highly efficient alloyed NiCu/Nb2O5 catalyst for the hydrodeoxygenation of biofuel precursors into liquid alkanes
Catalysis Science & Technology ( IF 4.4 ) Pub Date : 2020-06-19 , DOI: 10.1039/d0cy00684j
Peiying Wang _{1,

2,

3,

4,

5} , Yaxuan Jing _{1,

2,

3,

4,

5} , Yong Guo _{1,

2,

3,

4,

5} , Yan Cui _{4,

6,

7,

8,

9} , Sheng Dai _{4,

6,

7,

8,

9} , Xiaohui Liu _{1,

2,

3,

4,

5} , Yanqin Wang _{1,

2,

3,

4,

5}

Affiliation

Hydrodeoxygenation (HDO) is a crucial process for the synthesis of biofuels from renewable biomass. Here, several bimetallic Ni–M/Nb₂O₅ catalysts (M = Fe, Co, Cu) were synthesized and evaluated in the HDO of biofuel precursors (aldol adduct of furfural with acetone) to liquid alkane and it was found that Ni–Cu/Nb₂O₅ has the best performance (86.5% yield of octane and 5.1% yield of heptane). Various characterization techniques show that Ni–Cu alloy is formed over the Ni–Cu/Nb₂O₅ catalyst, which may have the main active metal sites. Moreover, the Ni–Cu alloy has more sites for the adsorption–activation of H₂, leading to the high activity. During the HDO process, the ring-opening of the intermediate butyl-tetrahydrofuran (BTHF) and the conversion of octanol are two rate-determining steps. The kinetic study confirms that the ring-opening of BTHF over Ni–Cu/Nb₂O₅ is more favorable than that over Ni/Nb₂O₅. More importantly, the Ni–Cu alloy significantly restrained the undesirable decarbonylation due to the weak adsorption of carbonyl, which was key for the efficient production of C_n alkanes. This work provides an in-depth understanding of the role of Ni–Cu alloys and new insights into the design of non-noble metal catalysts for the HDO of biofuel precursors.

中文翻译：

高效合金化NiCu / Nb2O5催化剂，用于将生物燃料前体加氢脱氧成液态烷烃

加氢脱氧（HDO）是从可再生生物质合成生物燃料的关键过程。在此，合成了几种双金属Ni–M / Nb ₂ O ₅催化剂（M = Fe，Co，Cu），并在生物燃料前体（丙酮与糠醛的醛醇加成物）与液态烷烃的HDO中进行了评估，结果发现Ni–M / Nb ₂ O ₅催化剂Cu / Nb ₂ O ₅具有最佳性能（辛烷收率86.5％，庚烷收率5.1％）。各种表征技术表明，在Ni-Cu / Nb ₂ O ₅催化剂上形成了Ni-Cu合金，该催化剂可能具有主要的活性金属部位。此外，Ni-Cu合金具有更多的H ₂吸附活化位点，导致活动活跃。在HDO过程中，中间体丁基四氢呋喃（BTHF）的开环和辛醇的转化是两个决定速率的步骤。动力学研究证实，BTHF在Ni–Cu / Nb ₂ O ₅上的开环比在Ni / Nb ₂ O ₅上的开环更有利。更重要的是，由于羰基的弱吸附，Ni-Cu合金显着抑制了不良的脱羰作用，这对于有效生产C _n烷烃至关重要。这项工作深入了解了镍铜合金的作用，并为设计用于生物燃料前体的HDO的非贵金属催化剂设计提供了新见解。

更新日期：2020-07-06

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