Continuous hydrogenation of halogenated nitroaromatic compounds in a micropacked bed reactor

Duan, Xiaonan; Yin, Jianjun; Feng, Aoxing; Huang, Miaoliang; Fu, Weisong; Xu, Wei; Huang, Zhenfu; Zhang, Jisong

doi:10.1007/s41981-021-00200-2

Cited by 16 publications

(15 citation statements)

References 41 publications

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“…The liquid flow rate affects the hydrodynamics and gas–liquid–solid interaction, and thus the hydrogenation performance of the reactor. 41 The effect of the liquid flow rate on the hydrogenation performance of FUR is summarized in Fig. 6.…”

Section: Resultsmentioning

confidence: 99%

Efficient and continuous furfural hydrogenation to furfuryl alcohol in a micropacked bed reactor

et al. 2023

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Section: Resultsmentioning

confidence: 99%

Efficient and continuous furfural hydrogenation to furfuryl alcohol in a micropacked bed reactor

et al. 2023

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“…For Pd/C catalysts, the side reaction of hydrodechlorination still cannot be avoided completely, according to some published research [22] . Duan [9b] also observed severe dehalogenation at continuous system when adopting Pd/C catalysts. Therefore, Other active metal catalysts(such as Ru based catalyst) or dehalogenated inhibitors(such as NaOAc, pyridine, quinoline) can be employed to address the issue of the catalytic hydrodechlorination of halogenated dinitro compounds [9b,21–23] …”

Section: Resultsmentioning

confidence: 99%

Micropacked‐bed Reactor for Continuous Hydrogenation of Aromatic Dinitro Compounds

Yang¹,

Liu²,

Ming³

et al. 2022

ChemistrySelect

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Due to the intricacy aromatic dinitro compound hydrogenation processes, it is difficult to attain high conversion and selectivity using merely modified catalysts in batch reactors. The micropacked-bed reactor (μPBR) offers efficient heat and mass transfer, a precise and controllable reaction process, and a high level of safety. In this work, the hydrogenation of 2,4dinitroanisole was selected as the model reaction, and a variety of catalysts were utilized in the continuous flow system based on μPBR for hydrogenation of 2,4-dinitroanisole. During 960 minutes of operation, the synthesis of 2,4-diaminoanisole was carried out using a Pd (OH) 2 /C catalyst and the optimal process condition, yielding 100 % conversion, 99.5 % selectivity, and the favorable durability. For the hydrogenation of relevant aromatic dinitro compounds, the continuous flow system demonstrates exceptional performance.

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“…We noted that although many different solid catalysts have been reported for the selective hydrogenation of different functionalized nitrobenzenes in the literature [1,2,5,11], there are no widely recognized benchmark systems. In particular, studies on the continuous-flow hydrogenation of DCNB were scarce, though there exists a very recent paper by Duan and co-workers [33]. For these reasons, pristine Ni/ZrO 2 was used as the reference to assess the effectiveness of the carbon deposits.…”

Section: Catalytic Performance In 12-dichloro-4-nitrobenzene Hydrogen...mentioning

confidence: 99%

Pre-Coking Strategy Strengthening Stability Performance of Supported Nickel Catalysts in Chloronitrobenzene Hydrogenation

Wang

Lin

et al. 2021

Catalysts

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Supported nickel catalysts represent a class of important catalytic materials in selective hydrogenations, but applications are frequently limited by metal agglomeration or active-site blocking induced by the presence of hydrogen halides. Herein, we report a novel pre-coking strategy, exposing the nickel nanoparticles under methane dry reforming conditions to manipulate performance in the continuous-flow hydrogenation of 1,2-dichloro-4-nitrobenzene. Compared with the pristine nickel catalyst, the nanotube-like coke-modified nickel catalyst showed weakened hydrogenating ability, but much improved stability and slightly better selectivity to the target product, 3,4-dichloroaniline. Characterization results revealed that the strengthened stability performance can be mainly linked to the reduced propensity to retain chlorine species, which seems to block the access of the substrate molecules to the active sites, and thus is a major cause of catalyst deactivation on the pristine nickel catalyst. Coke deposition can occur on the pre-coked nickel catalyst but not on the pristine analog; however, the impact on the stability performance is much milder compared with that on chlorine uptake. In addition, the presence of coke is also beneficial in restraining the growth of the nickel nanoparticles. Generally, the developed method might provide an alternative perspective on the design of novel transition-metal-based catalytic materials for other hydrogenation applications under harsh conditions.

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Continuous hydrogenation of halogenated nitroaromatic compounds in a micropacked bed reactor

Cited by 16 publications

References 41 publications

Efficient and continuous furfural hydrogenation to furfuryl alcohol in a micropacked bed reactor

Efficient and continuous furfural hydrogenation to furfuryl alcohol in a micropacked bed reactor

Micropacked‐bed Reactor for Continuous Hydrogenation of Aromatic Dinitro Compounds

Pre-Coking Strategy Strengthening Stability Performance of Supported Nickel Catalysts in Chloronitrobenzene Hydrogenation

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