Hydrogenolysis of lignin model compounds into aromatics with bimetallic Ru-Ni supported onto nitrogen-doped activated carbon catalyst

Hu, Yinghui; Jiang, Guangce; Xu, Guoqiang; Mu, Xindong

doi:10.1016/j.mcat.2017.12.009

Cited by 59 publications

(22 citation statements)

References 45 publications

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“…The diffractograms of the bimetallic catalysts do not allow ruling out the formation of Ni−Co alloys. 63,64 Some representative TEM images obtained for each catalyst are shown in Figure 2, and the estimated average particle size distribution is included in Table 1. The values indicate that Ni displays a smaller particle size compared to Co and that bimetallic catalysts seem to be more dispersed compared to monometallic.…”

Section: Methodsmentioning

confidence: 99%

Effect of the Support Functionalization of Mono- and Bimetallic Ni/Co Supported on Graphene in Hydrodeoxygenation of Guaiacol

Blanco

Carrales-Alvarado

Dongil

et al. 2021

Ind. Eng. Chem. Res.

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Mono- and bimetallic Ni/Co catalysts were prepared over reduced graphene oxide undoped and doped with N and evaluated in the hydrodeoxygenation of guaiacol in a batch reactor. Catalysts were characterized by N2 physisorption, CO chemisorption, XRD, TEM, TPR, and XPS. Results showed that catalytic activity was improved in all the cases by doping with N. Such enhancement was ascribed to electron transfer from the support to the metal particles. In the case of bimetallic catalysts, measured activity was improved, which can be ascribed to a synergistic effect between Ni and Co. Such an effect was stronger over the unmodified graphene than the one modified by N. The product distribution was unaffected by the support but differed from the respective monometallic catalysts suggesting the formation of new active sites.

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Section: Methodsmentioning

confidence: 99%

Effect of the Support Functionalization of Mono- and Bimetallic Ni/Co Supported on Graphene in Hydrodeoxygenation of Guaiacol

Blanco

Carrales-Alvarado

Dongil

et al. 2021

Ind. Eng. Chem. Res.

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“…Lignin, a main component of lignocellulosic biomass accounting for 15%-30% by weight and 40% by energy [1,2], is still not sufficiently used in biorefineries. Despite the significant advances in lignin depolymerisation via hydrogenolysis [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], oxidation [22][23][24][25][26][27], hydrolysis [28][29][30][31][32][33][34], thermal [35][36][37], photo- [38][39][40] and electro-chemical [41] transformations in the past decade, the depolymerized lignin is most often a complex mixture of phenolic compounds hampering direct use as high-value chemicals. This is first of all attributed to the non-uniform nature of lignin.…”

Section: Introductionmentioning

confidence: 99%

Single-step conversion of lignin monomers to phenol: Bridging the gap between lignin and high-value chemicals

Zhang

Lombardo

Gözaydın

et al. 2018

Chinese Journal of Catalysis

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Transformation of lignin into high-value chemicals is hampered by the complexity of monomers obtained from lignin depolymerization. Here we report a strategy, composed of hydro-demethoxylation and de-alkylation reactions, that is able to chemically converge various lignin-derived phenolic monomers into phenol in a single-step. Using 2-methoxy-4-propylphenol as a model compound, Pt/C exhibited the best performance in hydro-demethoxylation reaction affording >80% 4-propylphenol from 2-methoxy-4-propylphenol, while H-ZSM-5 was identified as the most suitable catalyst for de-alkylation, achieving 83% yield of phenol from 4-propylphenol. Since the two catalysts operate under compatible conditions, combining the two catalysts to simultaneously promote both hydro-demethoxylation and de-alkylation reactions was achieved. Configuration of how to organize the catalysts is a critical parameter, where the physical mixture of the two was most effective, providing over 60% phenol from 2-methoxy-4-propylphenol in a single-step.

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“…Based on Lanl2dz, the mechanism of methanol carbonylation of the catalyst was studied theoretically using density functional theory (DFT) and the B3LYP method. At the molecular level, the catalytic reaction mechanism was studied and the structure and energy of intermediates and transition states were obtained [ 25 ]. All energies were corrected at zero, while the reaction energy was compared with the catalytic performance of the Monsanto iodine catalyst.…”

Section: Methodsmentioning

confidence: 99%

Study on Rh(I)/Ru(III) Bimetallic Catalyst Catalyzed Carbonylation of Methanol to Acetic Acid

Zhang

Feng

et al. 2020

Materials

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In this study, a Rh(I)/Ru(III) catalyst with a bimetallic space structure was designed and synthesized. The interaction between the metals of the bimetallic catalyst and the structure of the bridged dimer can effectively reduce the steric hindrance effect and help speed up the reaction rate while ensuring the stability of the catalyst. X-ray photoelectron spectroscopy (XPS) results show that rhodium accepts electrons from chlorine, thereby increasing the electron-rich nature of rhodium and improving the catalytic activity. This promotes the nucleophilic reaction of the catalyst with methyl iodide and reduces the reaction energy barrier. The methanol carbonylation performance of the Rh/Ru catalyst was evaluated, and the results show that the conversion rate of methyl acetate and the yield of acetic acid are 96.0% under certain conditions. Furthermore, during the catalysis, no precipitate is formed and the amount of water is greatly reduced. It can be seen that the catalyst has good stability and activity.

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Hydrogenolysis of lignin model compounds into aromatics with bimetallic Ru-Ni supported onto nitrogen-doped activated carbon catalyst

Cited by 59 publications

References 45 publications

Effect of the Support Functionalization of Mono- and Bimetallic Ni/Co Supported on Graphene in Hydrodeoxygenation of Guaiacol

Effect of the Support Functionalization of Mono- and Bimetallic Ni/Co Supported on Graphene in Hydrodeoxygenation of Guaiacol

Single-step conversion of lignin monomers to phenol: Bridging the gap between lignin and high-value chemicals

Study on Rh(I)/Ru(III) Bimetallic Catalyst Catalyzed Carbonylation of Methanol to Acetic Acid

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