Re/AC catalysts for selective hydrogenation of dimethyl 1, 4-cyclohexanedicarboxylate to 1, 4-cyclohexanedimethanol: Essential roles of metal dispersion and chemical environment

Luo, Jingjie; Qu, Enhui; Zhou, Yixue; Dong, Yazhou; Liang, Changhai

doi:10.1016/j.apcata.2020.117669

Cited by 15 publications

(14 citation statements)

References 44 publications

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“…The deposition of Co particles caused the obvious decreased ratio of the later adsorption peak, suggesting the decreasing number of oxygenated groups during metal loading. Our previous research confirmed the possible consumption of surface oxygenated groups during tight metal loading (Luo et al, 2017;Luo et al, 2020). After the two-step thermal treatment, the adsorption peaks in the reduced Co/CNT-C were further exhausted.…”

Section: Eosupporting

confidence: 56%

Chemical kinetics and promoted Co-immobilization for efficient catalytic carbonylation of ethylene oxide into methyl 3-hydroxypropionate

et al. 2022

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The carbonylative transformation of ethylene oxide (EO) into methyl 3-hydroxypropionate (3-HPM) is a key process for the production of 1,3-propanediol (1,3-PDO), which is currently viewed as one of the most promising monomers and intermediates in polyester and pharmaceuticals industry. In this work, a homogeneous reaction system using commercial Co2(CO)8 was first studied for the carbonylation of EO to 3-HPM. The catalytic behavior was related to the electronic environment of N on aromatic rings of ligands, where N with rich electron density induced a stronger coordination with Co center and higher EO transformation. A reaction order of 2.1 with respect to EO and 0.3 with respect to CO was unraveled based on the kinetics study. The 3-HPM yield reached 91.2% at only 40°C by Co2(CO)8 coordinated with 3-hydroxypyridine. However, Co-containing colloid was formed during the reaction, causing the tough separation and impossible recycling of samples. Concerning the sustainable utilization, Co particles immobilized on pre-treated carbon nanotubes (Co/CNT-C) were designed via an in situ reduced colloid method. It is remarkable that unlike conventional Co/CNT, Co/CNT-C was highly selective toward the transformation of EO to 3-HPM with a specific rate of 52.2 mmol·gCo-1·h-1, displaying a similar atomic efficiency to that of coordinated Co2(CO)8. After reaction, the supported Co/CNT-C catalyst could be easily separated from the liquid reaction mixture, leading to a convenient cyclic utilization.

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Section: Eosupporting

confidence: 56%

Chemical kinetics and promoted Co-immobilization for efficient catalytic carbonylation of ethylene oxide into methyl 3-hydroxypropionate

et al. 2022

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“…3) are the most promising properties compared to other active/inert materials. They have been used for a long time as valuable supports for precious metals such as Pt, Pd, and Ru [44][45][46][47][48].…”

Section: Carbon and Goldmentioning

confidence: 99%

Development of gold catalysts supported by unreducible materials: Design and promotions

Luo

Dong

Petit

et al. 2021

Chinese Journal of Catalysis

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Gold catalysis had been considered a highly efficient candidate for heterogeneous catalysis. It is well established that reducible-material-supported Au NPs are more reactive than the unreducible materials, unless specific modifications are carried out. However, unreducible materials such as carbon materials, silica, and alumina have particular advantages, including the easily controlled surface property, adjustable microscopic structure, earth-abundant reserves, and facile industrial manufacture. New strategies, influences, and mechanisms of modification to enhance the catalytic performance and thermal stability of unreducible-material-supported gold catalysts are among the most attractive research topics in gold catalysis. However, to the best of our knowledge, reports and reviews focused on unreducible-material-supported gold catalysts are lacking. Herein, the above concept will be thoroughly discussed regarding several typical unreducible supports, including the commonly used silica, alumina, carbon materials, and hydroxyapatite. The currently prevailing modification strategies will be summarized in detail from the aspects of theoretical conceptualization and practical methodology, including the ingenious synthesis method for catalyst with a specific structure, the currently prosperous electrostatic adsorption, colloid immobilization, and the applicative thermal gaseous treatment. The influences of physical and chemical modifications on the surface chemistry, electronic structure, interaction/synergy between Au-support/promoter, catalyst morphology and water precipitation will be also summarized. It is assumed that the review will shed light on significant studies on unreducible support in gold catalysis with the purpose of catalytic promotion and the promotion of the potential industrial demands in advance. Furthermore, the review will provide new insights into unreducible supports that can be potentially applied in gold catalysis.

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“…In fact, compared with the freshly dried samples at 60 C, the series of Au/CNT samples lost about 5-8% weight mass aer calcination, mostly attributed to the surface adsorbed moisture. The surface evolution and generation of defects simultaneously occurred during the thermal treatment, 25,26 with the CNT structure being well-maintained, as shown by the TEM images.…”

Section: Chemical and Surface Information Of Au/cntmentioning

confidence: 83%

“…The puried CNT displays a small asymmetric reduction peak centered at about 600 C, which should be attributed to carbon methanation in the presence of H 2 . 26 The deposition of Au NPs facilitates the methanation of CNT as the reduction peak area further increases in Au/CNT-A. The reduction of the gold species should be located at a lower position (50-150 C), which is absent in the detected sample, suggesting that most of the Au species on the surface have been reduced.…”

Section: Catalytic Evaluation Of the Au/cnt Catalystmentioning

confidence: 95%

Boosting the catalytic behavior and stability of a gold catalyst with structure regulated by ceria

et al. 2022

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Re/AC catalysts for selective hydrogenation of dimethyl 1, 4-cyclohexanedicarboxylate to 1, 4-cyclohexanedimethanol: Essential roles of metal dispersion and chemical environment

Cited by 15 publications

References 44 publications

Chemical kinetics and promoted Co-immobilization for efficient catalytic carbonylation of ethylene oxide into methyl 3-hydroxypropionate

Chemical kinetics and promoted Co-immobilization for efficient catalytic carbonylation of ethylene oxide into methyl 3-hydroxypropionate

Development of gold catalysts supported by unreducible materials: Design and promotions

Boosting the catalytic behavior and stability of a gold catalyst with structure regulated by ceria

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