Comparison of Kinetics and Activity of Ni‐Based Catalysts for Benzyl Phenyl Ether Catalytic Hydrogenolysis

Zhu, Chen; Cao, Jing‐Pei; Xie, Tao; Zhao, Xiao-Yan; Cui, Xin; Guo, Zhenxing; Shen, Wenzhong; Bai, Jin; Wei, Xian‐Yong

doi:10.1002/ente.201800694

Cited by 10 publications

(4 citation statements)

References 44 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The result revealed that the hydrogen source was mainly provided by H 2 . The literature reported Ni/AC selectively cleaved BPE under a H 2 atmosphere with a conversion of 22% but no conversion under an Ar atmosphere at 120 °C and 40 min, which was well consistent with the experiment result.…”

Section: Resultssupporting

confidence: 91%

“…The hydrogen donor from H 2 and isopropanol was used for catalytic hydrogenolysis of DPE over Ni/AC-3. The hydrogen donor provided H•, and abundant H• adsorbed and activated on the Ni surface to form Ni–H to promote the hydrogenolysis of DPE. , Meanwhile, water produced by the dehydration of isopropanol over Ni/AC-3 led to the hydrolysis of a small amount of DPE. Isopropanol played a significant role in this catalytic reaction.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Selective Cleavage of the Diphenyl Ether C–O Bond over a Ni Catalyst Supported on AC with Different Pore Structures and Hydrophilicities

et al. 2021

Self Cite

View full text Add to dashboard Cite

Selective cleavage of C−O bonds in diphenyl ether (DPE), a lignin-derived 4-O-5 linkage, is a challenging topic and of great significance to produce value-added aromatic products for sustainable future. Activated carbon (AC) with different pore structures has different catalytic effects on the reaction. Herein, Ni catalysts supported on AC-1, AC-2, and AC-3 with specific surface area (SSA) values of 829, 1731, and 2399 m 2 /g, respectively, were investigated in the hydrogenolysis and hydrolysis of DPE. The proper pore structure of AC facilitates the entry of reactants and promotes the reaction. AC with a larger SSA and stronger hydrophilicity was more conducive to metal dispersion and water adsorption to promote the hydrogenolysis/hydrolysis of DPE. The apparent activation energy (E a ) and the turnover frequency further demonstrated that Ni/AC-3 possessed the highest catalytic activity compared to Ni/AC-2 and Ni/AC-1. Catalytic hydrogenolysis/hydrolysis of DPE can be therefore achieved over Ni/AC-3 under mild conditions (180 °C and 1 MPa H 2 ), which is highly selective to afford cyclohexane and cyclohexanol as the major products with the selectivities of 35.5 and 63.9%, respectively. The application of a hydrophilic Ni/AC catalyst with a high SSA may provide a promising approach for the valorization of lignin-derived fragments.

show abstract

Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Selective Cleavage of the Diphenyl Ether C–O Bond over a Ni Catalyst Supported on AC with Different Pore Structures and Hydrophilicities

et al. 2021

Self Cite

View full text Add to dashboard Cite

show abstract

“…The crystal structure of Al 2 O 3 is not affected by the loading of Ni. Peaks at 2θ of 37.60° and 66.76° are the characteristic diffraction peak of γ‐Al 2 O 3 and the peaks at 2θ of 44.51°, 51.85° and 76.37° are attributed to the metallic nickel phase . The peaks of Ni are not detected on 1Ni/Al 2 O 3 due to the small crystallinity or highly dispersed of Ni.…”

Section: Resultsmentioning

confidence: 99%

In‐Situ Upgrading of Coal Pyrolysis Tar with Steam Catalytic Cracking over Ni/Al₂O₃ Catalysts

Cao

Wang

et al. 2020

ChemistrySelect

View full text Add to dashboard Cite

In-situ upgrading of coal pyrolysis tar with steam catalytic cracking (SCC) is a promising technique to improve tar quality. In this study, Ni/Al 2 O 3 catalysts with different Ni contents were used for in-situ SCC of coal pyrolysis tar at 650°C. The results showed that Ni/Al 2 O 3 catalysts can enhance the water conversion and light tar yield. Both SCC and tar catalytic cracking can occur simultaneously over Ni/Al 2 O 3 , and the free radicals produced by tar catalytic cracking can be stabilized by active species generated from SCC to avoid excessive cracking of tar and improve light tar yield. 4Ni/Al 2 O 3 (4 wt. % Ni) exhibits the best performance, contributing to the highest water conversion of 4.74 wt. % and light tar yield of 11.90 wt. %, respectively.Correspondingly, the content of light fraction (boiling point less than 360°C) in tar sample increases from 48.0 wt. % to 67.0 wt. %, and the average molecular weight decreases from 353 amu to 253 amu over 4Ni/Al 2 O 3 . This is consistent with the increase of benzenes, phenols and naphthalenes and the decrease of long-chain aliphatic hydrocarbons, 3-and 4-ring aromatics in upgraded tar. In addition, the higher ratio of uncondensed aromatic protons to condensed aromatic protons in upgraded tar reveals the fact that 4Ni/Al 2 O 3 can promote ring-opening reaction of PAHs, which can well interpret the tar upgrading process.

show abstract

“…Among them, Ni is the most used due to its relatively low cost and considerable catalytic activity. Work in this area aims at optimizing the hydrogenolysis of the CÀ O bonds connecting the aromatic rings, [20][21][22][23][24][25][26][27][28][29] keeping the hydrogenation of phenol as low as possible.…”

Section: Introductionmentioning

confidence: 99%

Controlling C−OAryl Hydrogenolysis vs Aryl Hydrogenation in Lignin Model Depolymerization Using Ni‐, Rh‐ or Ni/Rh‐based Silica Catalysts

Raachini,

Romdhane,

Sassoye

et al. 2023

ChemCatChem

View full text Add to dashboard Cite

This paper focuses on the hydrogenolysis of 2‐phenoxy‐1‐phenylethanone, modelling a pre‐oxidized form of lignin using five catalysts of similar metal content, prepared by impregnation of Ni(II), Rh(III) and both metals onto Aerosil‐380 in the presence of NH3, followed by a reduction step. The materials were characterized in the dried as‐synthesized state and after consecutive reductive and oxidative treatments, showing the great dispersion of the metal (oxide nanoparticles with sizes<2 nm). Working with 1 mol % of the reduced metal (500 °C) per substrate at 180 °C with isopropanol as H‐donor, the most active catalyst, but also the least selective towards phenol, was initially found to be the Ni‐based one. Under similar conditions, the lower capacity of the Rh‐based catalyst to induce H transfer from isopropanol favoured phenol formation but resulted in much slower C−OAr cleavage. Despite a very high dispersion of the two metals in the bimetallic catalysts, no synergy was found, suggesting that Ni would be segregated at the surface. Finally, the best phenol productivity could be reached by reducing the Ni‐based catalyst at 650 °C, which led to a more efficient cleavage of C−OAr bonds. In this way, it was possible to produce 8 times more phenol per hour.

show abstract

Comparison of Kinetics and Activity of Ni‐Based Catalysts for Benzyl Phenyl Ether Catalytic Hydrogenolysis

Cited by 10 publications

References 44 publications

Selective Cleavage of the Diphenyl Ether C–O Bond over a Ni Catalyst Supported on AC with Different Pore Structures and Hydrophilicities

Selective Cleavage of the Diphenyl Ether C–O Bond over a Ni Catalyst Supported on AC with Different Pore Structures and Hydrophilicities

In‐Situ Upgrading of Coal Pyrolysis Tar with Steam Catalytic Cracking over Ni/Al₂O₃ Catalysts

Controlling C−OAryl Hydrogenolysis vs Aryl Hydrogenation in Lignin Model Depolymerization Using Ni‐, Rh‐ or Ni/Rh‐based Silica Catalysts

Contact Info

Product

Resources

About

Comparison of Kinetics and Activity of Ni‐Based Catalysts for Benzyl Phenyl Ether Catalytic Hydrogenolysis

Cited by 10 publications

References 44 publications

Selective Cleavage of the Diphenyl Ether C–O Bond over a Ni Catalyst Supported on AC with Different Pore Structures and Hydrophilicities

Selective Cleavage of the Diphenyl Ether C–O Bond over a Ni Catalyst Supported on AC with Different Pore Structures and Hydrophilicities

In‐Situ Upgrading of Coal Pyrolysis Tar with Steam Catalytic Cracking over Ni/Al2O3 Catalysts

Controlling C−OAryl Hydrogenolysis vs Aryl Hydrogenation in Lignin Model Depolymerization Using Ni‐, Rh‐ or Ni/Rh‐based Silica Catalysts

Contact Info

Product

Resources

About

In‐Situ Upgrading of Coal Pyrolysis Tar with Steam Catalytic Cracking over Ni/Al₂O₃ Catalysts