93-51-6Relevant articles and documents
Mild-temperature hydrodeoxygenation of vanillin over porous nitrogen-doped carbon black supported nickel nanoparticles
Nie, Renfeng,Yang, Huanhuan,Zhang, Haifu,Yu, Xiaolong,Lu, Xinhuan,Zhou, Dan,Xia, Qinghua
, p. 3126 - 3134 (2017)
Porous nitrogen-doped carbon black (NCB) was synthesized by facile carbonization of carbon black (CB) coated with polypyrrole (CB@polypyrrole) and used as a support for Ni nanoparticles (NPs). The microstructure, reducibility and crystallinity of the as-synthesized materials were investigated by transmission electron microscopy (TEM), H2-TPR/TPD, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD). It was found that surface nitrogen species on NCB significantly promote the decomposition of the nickel precursor and the reduction of nickel oxide, and improve the stability of metallic Ni in ambient atmosphere. In the selective hydrodeoxygenation (HDO) of vanillin in the aqueous phase at low hydrogen pressure (0.5 MPa) and mild temperature (150 °C), Ni/NCB shows much higher activity than N-free catalysts. This is ascribed to the higher reducibility, the lower oxidation state of Ni NPs and the enhanced hydrogen spillover of Ni to the support. Moreover, the Ni/NCB catalyst is relatively cheap and easy to scale-up the production of, thus achieving a low-cost transformation of biomass to bio-oils.
Silica/titania composite-supported NiCo catalysts with combined catalytic effects for phenol hydrogenation under fast and mild conditions
Li, Yucheng,Liu, Jing,He, Jing,Wang, Luying,Lei, Jiandu
, (2020)
The effect of titanium as a promoter for the nickel-cobalt/silica-titania (NiCo/Si-Ti) catalyst in the hydrogenation of phenol was comparatively studied. In the phenol hydrogenation under mild reaction conditions (1 MPa H2 pressure and 100 °C), the Ti-promoter induces the formation of the Coδ??OV?Ti3+ active sites and enhances the hydrogenation activity of the NiCo/Si catalyst to convert phenol to cyclohexanol. The catalytic hydrogenation with the optimal composition of the NiCo/Si-1.0Ti (Si:Ti ratio of 8.5:1) catalyst was completed within 1 h (conversion 98.2 % and selectivity >99 %), which was more efficiently than that with other Ti-doped catalysts and NiCo/Si as baseline, indicating a strong positive synergistic effect between the metal (Ni-Co) and support (Ti-Si) components of the catalyst in this reaction. Additionally, the kinetics, pathway and catalytic mechanism of the hydrogenation of phenol are also examined. Furthermore, the NiCo/Si-1.0Ti catalysts also showed a good performance at reducing the unstable oxygenated compounds in the bio-oil.
SELECTIVE HYDRODEOXYGENATION OF AROMATIC COMPOUNDS
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Paragraph 0228-0231; 0238; 0245-0246; 0249; 0255, (2021/07/02)
Disclosed are methods of selective hydrodeoxygenation of aromatic compounds by using catalyst systems comprising N-heterocyclic carbene (NHC) and 4-pyridinol-derived pincer ligands and metal complexes containing these ligands.
Resin-supported iridium complex for low-temperature vanillin hydrogenation using formic acid in water
Smith, Christene A.,Brandi, Francesco,Al-Naji, Majd,Guterman, Ryan
, p. 15835 - 15840 (2021/05/19)
Biorefinery seeks to utilize biomass waste streams as a source of chemical precursors with which to feed the chemical industry. This goal seeks to replace petroleum as the main feedstock, however this task requires the development of efficient catalysts capable of transforming substances derived from biomass into useful chemical products. In this study, we demonstrate that a highly-active iridium complex can be solid-supported and used as a low-temperature catalyst for both the decomposition of formic acid (FA) to produce hydrogen, and as a hydrogenation catalyst to produce vanillyl alcohol (VA) and 2-methoxy-4-methylphenol (MMP) from vanillin (V); a lignin-derived feedstock. These hydrogenation products are promising precursors for epoxy resins and thus demonstrate an approach for their production without the need for petroleum. In contrast to other catalysts that require temperatures exceeding 100 °C, here we accomplish this at a temperature of 50 °C in water under autogenous pressure. This approach provides an avenue towards biorefinery with lower energy demands, which is central to the decentralization and broad implementation. We found that the high activity of the iridium complex transfers to the solid-support and is capable of accelerating the rate determining step; the decomposition of FA into hydrogen and carbon dioxide. The yield of both VA and MMP can be independently tuned depending on the temperature. The simplicity of this approach expands the utility of molecular metal complexes and provides new catalyst opportunities in biorefinery.
Method for catalyzing hydrodeoxygenation of vanillin by using MOF-based nano composite material
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Paragraph 0024; 0031-0033; 0040-0042; 0049-0050, (2021/07/31)
The invention discloses a method for catalyzing hydrodeoxygenation of vanillin by using an MOF-based nano composite material, which is characterized in that a UiO-series MOFs material with relatively good hydrothermal stability is used as a carrier and is combined with metal nanoparticles to catalyze hydrodeoxygenation of vanillin. The method solves some problems of a traditional catalyst carrier in the hydrodeoxygenation reaction of vanillin, such as self-sintering, carbon deposition, leaching of active components, and great influence on activity in the reaction process. According to the invention, the active component can be well anchored, the performance of the active component can be promoted, the high yield of the target deoxidation product can be achieved, and the excellent catalysis effect can be achieved.