Non-noble Metallic Fe Catalyst Systems for the Reductive Carbonylation of Nitrobenzene

Zhang, Jun; Li, Yunping; Zhao, Bang‐Tun

doi:10.6023/a1105163

Cited by 2 publications

(1 citation statement)

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“…The much lower H 2 consumption by Co/CNT-C (2,500 μmol/g) than Co/CNT-I (3815 μmol/g) during H 2 -TPR (Figure 5E) further confirmed the accumulation of oxidative Co species in the Co/CNT-I. The combination results of XRD and XPS suggested a higher dispersion of Co particles with more Co 0 sites exposed on the surface, which may correlated with the faster reaction rate via Co/CNT-C samples as reported by many carbonylation research works using supported metal catalysts (Xu et al, 2011;Zhang, 2012;Ibrahim and Denmark, 2018;Wang et al, 2021). The Co/CNT-C was further tested as a recycle catalyst for the EO carbonylation.…”

Section: Eosupporting

confidence: 78%

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: 78%