Ru–Ni/Al2O3 bimetallic catalysts with high catalytic activity for N-propylcarbazole hydrogenation

2020 ◽  
Vol 10 (7) ◽  
pp. 2268-2276 ◽  
Author(s):  
Chenguang Li ◽  
Ming Yang ◽  
Zhenjie Liu ◽  
Zhenlin Zhang ◽  
Ting Zhu ◽  
...  
Keyword(s):  
Activation Energy ◽  
Catalytic Activity ◽  
Catalytic Hydrogenation ◽  
Bimetallic Catalysts ◽  
High Catalytic Activity ◽  
Hydrogenation Activity

The as-prepared 5 wt% Ru2.5Ni2.5/Al2O3 catalyst shows the best catalytic hydrogenation activity for NPCZ and the lowest hydrogenation activation energy.

scholarly journals Bimetallic nickel-lutetium complexes: tuning the properties and catalytic hydrogenation activity of the Ni site by varying the Lu coordination environment

2019 ◽  
Vol 10 (11) ◽  
pp. 3375-3384 ◽  
Author(s):  
Bianca L. Ramirez ◽  
Prachi Sharma ◽  
Reed J. Eisenhart ◽  
Laura Gagliardi ◽  
Connie C. Lu
Keyword(s):  
Catalytic Activity ◽  
Catalytic Hydrogenation ◽  
Coordination Environment ◽  
Hydrogenation Activity ◽  
Styrene Hydrogenation

Varying the Lu coordination environment tunes the Ni–Lu interaction and the catalytic activity of the Ni site in styrene hydrogenation.

The Effect of AlCl3 and Ti on Hydrogen Storage Performance of 4MgH2-Li3AlH6 System

2016 ◽  
Vol 852 ◽  
pp. 876-882
Author(s):  
Fang Yu ◽  
Fen Xu ◽  
Li Xian Sun ◽  
Xiang Fei Zhang ◽  
Lin Wang ◽  
...  
Keyword(s):  
Activation Energy ◽  
Catalytic Activity ◽  
Hydrogen Storage ◽  
Onset Temperature ◽  
High Catalytic Activity ◽  
Storage Performance ◽  
Preparation Conditions ◽  
Solid Ball ◽  
Hydrogen Storage Performance ◽  
Co Doped

The AlCl3/Ti co-doped 4MgH2-Li3AlH6 has been successfully synthesized using solid ball-milled method. The effect of AlCl3/Ti and different preparation conditions on reversible hydrogen storage of 4MgH2-Li3AlH6 were investigated. It was found that the formed Al3Ti and Al can improve the de/rehydriding performance. The onset temperature of the system dehydrogenation decreased to 58 °C, and it can release hydrogen of 7.2 wt.% at 400 °C. The hydriding of the system was found that the adsorption rate greatly increased from 0.02 to 0.35 wt.% min-1. The activation energy (Ea) of MgH2 dehydrogenation decreased from 147 to 113.7 kJ mol-1 by adding additive AlCl3 and Ti. The AlCl3/Ti improved the thermodynamic and kinetic performance of the 4MgH2-Li3AlH6 composite, which was attributed to the high catalytic activity of Al3Ti and Al.

Towards rational design of core–shell catalytic nanoreactor with high performance catalytic hydrogenation of levulinic acid

2016 ◽  
Vol 6 (13) ◽  
pp. 5102-5115 ◽  
Author(s):  
Biplab Banerjee ◽  
Ramana Singuru ◽  
Sudipta K. Kundu ◽  
Karnekanti Dhanalaxmi ◽  
Linyi Bai ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Catalytic Hydrogenation ◽  
Levulinic Acid ◽  
High Performance ◽  
Rational Design ◽  
Core Shell ◽  
High Catalytic Activity

Core–shell catalytic nanoreactor was designed, exhibiting high catalytic activity for levulinic acid hydrogenation.

Relation between reduction and sulphidation process during the activation of a Co-Mo/Al2O3 hydrodesulphurization catalyst

1985 ◽  
Vol 50 (7) ◽  
pp. 1573-1581 ◽  
Author(s):  
Hana Zahradníková ◽  
Václav Kárník ◽  
Ludvík Beránek
Keyword(s):  
Activation Energy ◽  
Catalytic Activity ◽  
Apparent Activation Energy ◽  
Ethylene Hydrogenation ◽  
Hydrogenation Activity ◽  
Oxygen Chemisorption ◽  
Predominant Process ◽  
Chemisorption Capacity

The course of activation at 673 and 773 K of an industrial hydrodesulphurization catalyst CHEROX 36-01 was followed gravimetrically. Reduction with hydrogen, reductive sulphidation with a H2S/H2 mixture, non-reductive sulphidation with a H2S/He mixture and sulphidation of prereduced catalysts were compared. All sulphidation procedures are much faster than the reduction alone, the latter has, however, a higher apparent activation energy. In the reductive sulphidation with H2S/H2, reduction and sulphidation take place simultaneously, sulphidation being a predominant process at the beginning of the activation, especially at 673 K. It has been shown how the two processes can be decoupled or superposed. The catalytic activity in ethylene hydrogenation develops much more slowly when the catalyst is activated only by reduction than when it is activated by reductive sulphidation, in accordance with the relative velocities of these two activation procedures. The hydrogenation activity of catalysts reduced to a different extent correlates with their oxygen chemisorption capacity at 195 K.

Pd nanoparticles stabilized with phosphine-functionalized porous ionic polymer for efficient catalytic hydrogenation of nitroarenes in water

2020 ◽  
Vol 44 (9) ◽  
pp. 3681-3689 ◽  
Author(s):  
Yizhu Lei ◽  
Zaifei Chen ◽  
Guosong Lan ◽  
Renshu Wang ◽  
Xiao-Yu Zhou
Keyword(s):  
Catalytic Activity ◽  
Catalytic Hydrogenation ◽  
Palladium Nanoparticles ◽  
Pd Nanoparticles ◽  
Catalytic Performance ◽  
High Catalytic Activity ◽  
Ionic Polymer ◽  
Electron Donation ◽  
Nano Size ◽  
Excellent Catalytic Performance

Small palladium nanoparticles stabilized with phosphine-functionalized PIP displayed high catalytic activity for nitroarenes hydrogenation. Nano-size Pd particles, electron-donation effect of phosphine ligand, and surface wettability account for its excellent catalytic performance.

Effects of Promoters on Properties of Cu-Zn-Al Catalyst for Selective Hydrogenation of Cinnamaldehyde to Cinnamyl Alcohol

2011 ◽  
Vol 393-395 ◽  
pp. 1185-1188
Author(s):  
Chang You Li ◽  
Xiao Yan Li ◽  
Yi Fei Guo
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Catalytic Hydrogenation ◽  
Selective Hydrogenation ◽  
Reaction Rate ◽  
Steric Effect ◽  
Cinnamyl Alcohol ◽  
Active Centers ◽  
Hydrogenation Activity

Cu-Zn-Al catalyst was modified by the additives such as Ni and Mn, and the prepared catalyst was employed in the selective catalytic hydrogenation of cinnamaldehyde. The results showed that the addition of Ni could improve catalytic activity significantly, moreover, the improving effect was highest when Zn was replaced by Ni, simultaneously leading to excessive hydrogenation. The Cu-(5%)Mn-Zn-Al catalyst exhibited a higher selectivity of 93.6% for C = O bond to cinnamyl alcohol and hydrogenation activity of 33.0% conversion at 130°C under 1.0 MPa of H2 pressure with the reaction time of 1 h. TPR and XRD characterization showed that Mn promoter was favorable for the growth of Cu0 fine grains on the surface of catalyst, which not only led to steric effect which improved the selectivity for cinnamyl alcohol, but also reduced the numbers of active centers, consequently decreased the reaction rate.

scholarly journals Renewable Cyclopentanol From Catalytic Hydrogenation-Rearrangement of Biomass Furfural Over Ruthenium-Molybdenum Bimetallic Catalysts

2020 ◽  
Vol 8 ◽  
Author(s):  
Shihang Meng ◽  
Yujing Weng ◽  
Xiaolong Wang ◽  
Hongxing Yin ◽  
Zhenfei Wang ◽  
...  
Keyword(s):  
Catalytic Hydrogenation ◽  
Selective Hydrogenation ◽  
Bimetallic Catalysts ◽  
Bimetallic Catalyst ◽  
Catalytic Performance ◽  
Fine Chemicals ◽  
Product Selectivity ◽  
Rearrangement Product ◽  
Hydrogenation Activity ◽  
Rearrangement Reaction

Biomass furfural-like compounds are chemicals that cannot be extracted from fossil materials, through which a large number of fine chemicals and fuel additives can be opened up, but one big efficiency problem during the transformation is the accumulation of oligomers. Here, we propose a novel and efficient Ru-Mo bimetallic catalyst for selective hydrogenation-rearrangement of furfural-like compounds. The result showed that an unprecedented rearrangement product selectivity of 89.1% to cyclopentanol was achieved under an optimized reaction condition over a 1%Ru−2.5%Mo/CNT catalyst reduced at 600°C. Subsequent characterization suggested that the catalyst presented with weak acidity and strong hydrogenation activity for the reaction, which not only ensures the smooth hydrogenation-rearrangement reaction but also inhibits the accumulation of furan polymers. These findings provide a convenient strategy to tune the catalytic performance of Mo-based catalysts by controlling the reduction and carburization conditions, which appear to be versatile for the rearrangement of furans and similar compounds.

A highly efficient heterogeneous catalyst of cobalt-based coordination polymers for aerobic epoxidation of cyclohexene

CrystEngComm ◽  
2018 ◽  
Vol 20 (34) ◽  
pp. 5074-5078 ◽  
Author(s):  
Fan Yu
Keyword(s):  
Activation Energy ◽  
Catalytic Activity ◽  
Heterogeneous Catalyst ◽  
Coordination Polymers ◽  
Reaction Pathway ◽  
High Catalytic Activity ◽  
Highly Efficient ◽  
Epoxidation Of Cyclohexene ◽  
Efficient Heterogeneous Catalyst

A novel heterogeneous catalyst of cobalt-based coordination polymers using a tyrosine-based derivative has been successfully constructed, and it exhibits high catalytic activity in changing the reaction pathway and lowering the activation energy to 25.5 kJ mol−1.

Novel synthesis of silver/reduced graphene oxide nanocomposite and its high catalytic activity towards hydrogenation of 4-nitrophenol

RSC Advances ◽  
2015 ◽  
Vol 5 (87) ◽  
pp. 70968-70971 ◽  
Author(s):  
Nannan Meng ◽  
Shujie Zhang ◽  
Yifeng Zhou ◽  
Wangyan Nie ◽  
Pengpeng Chen
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
High Activity ◽  
Reduced Graphene Oxide ◽  
Catalytic Hydrogenation ◽  
High Catalytic Activity ◽  
Impregnation Process ◽  
Novel Synthesis ◽  
Reduced Graphene

Ag/RGO nanocomposites were prepared via reducing AgNO3 in a macroscopic RGO aerogel directly through a convenient impregnation process, which exhibited high activity in the catalytic hydrogenation of 4-nitrophenol.

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