Catalytic HDC/HDN of 4-chloronitrobenzene in water under ambient-like conditions with Pd supported on pillared clay

Pizarro, A.H.; Molina, C.B.; Casas, José A.; Rodrı́guez, Juan J.

doi:10.1016/j.apcatb.2014.04.011

Cited by 38 publications

(7 citation statements)

References 34 publications

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“…Among them, Pd is the metal least affected by the catalyst poisoning properties of the chloride ions released [20,21] and is commonly identified as the most suitable active phase for liquid-phase HDC [20,22]. The catalytic support plays also an important role in both catalytic activity and stability and has been investigated on carbon [6,[23][24][25], alumina [14,16,26], zirconia [27,28] and pillared clays [29,30], among other, with alumina and activated carbon being the most reported systems in the literature [15,31,32]. It is generally accepted that alumina presents a high mechanical resistance and a strong interaction with supported metals leading to enhanced metal dispersion but it is also quite sensitive to the HCl formed upon the reaction [20,33].…”

Section: Introductionmentioning

confidence: 99%

Deducing kinetic constants for the hydrodechlorination of 4-chlorophenol using high adsorption capacity catalysts

Muñoz

Kaspereit

Etzold

2016

Chemical Engineering Journal

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Employing high surface area supports for catalytic hydrodechlorination can result in pronounced adsorption of reactants, intermediates and products. The influence of these sorption processes on the activity and selectivity upon 4-chlorophenol (4-CP) hydrodechlorination in aqueous solution has been studied using four commercial Pd/Al2O3 and Pd/AC catalysts at ambient pressure within the temperature range of 20-40°C ([4-CP]0=0.78-2.90mmolL-1, [catalyst]=1gL-1, 50NmLH2min-1). The adsorption capacity of the catalysts was independently evaluated. The Al2O3-based catalyst did not show any significant adsorption of those species whereas the activated carbon materials presented in all cases high uptakes (e.g. up to 2.4mmol4-CPgcat -1). In order to deduce true kinetic constants also for these catalysts, a kinetic model was developed, which accounts for the consecutive reaction and sorption processes in parallel. This expanded model resulted in a reasonable fit, can thus be used for comparison of different catalysts regardless their sorption capacity and allows predicting successfully the selectivity to the reaction productsThe authors gratefully acknowledge the funding of the German Research Council (DFG), which within the framework of its “Excellence Initiative” supports the Cluster of Excellence “Engineering of Advanced Materials” (www.eam.fau.de) at the University of Erlangen-Nurember

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Section: Introductionmentioning

confidence: 99%

Deducing kinetic constants for the hydrodechlorination of 4-chlorophenol using high adsorption capacity catalysts

Muñoz

Kaspereit

Etzold

2016

Chemical Engineering Journal

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“…Similarly, P. fluorescens may accept electrons from the electrode in BES‐P and accelerate the transformation from p‐CNB to p‐CAN, thus its p‐CNB degradation rate was higher than that of anaerobic degradation conditions (AES‐P). However, the reaction activation energy of removing chlorine is higher than that of nitro reduction, thus the hydrodechlorination of p‐CNB needed hydrogen evolution providing reducing power. According to the CV analysis, BES‐I illustrated higher hydrogen evolution capability than BES‐P (Fig.…”

Section: Resultsmentioning

confidence: 99%

Bioaugmentation of p‐chloronitrobenzene in bioelectrochemical systems with Pseudomonas fluorescens

Song

Zhou

Wang

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: p-Chloronitrobenzene (p-CNB) is easily accumulated in the environment and subsequently is a threat to humans and the ecosystem. The anaerobic process as an important pathway for p-CNB degradation has a relatively low degradation rate. This study illustrated that the strain Pseudomonas fluorescens was evaluated as the biocatalyst for bioaugmentation to enhance the p-CNB removal in bioelectrochemical system (BES). RESULTS:When the initial p-CNB concentration was 100 mg L −1 , the p-CNB removal efficiency reached 100% at 12 h in BES with P. fluorescens. All the p-CNB removal efficiencies in BES were higher than that in anaerobic degradation and electrocatalysis. Meantime, the highest total organic carbon (TOC) removal efficiency was obtained at 89.8% after augmentation with P. fluorescens. During the bioaugmentation, microbial community analysis showed that the main abundance changes were in Pseudomonas, Romboutsia and Macellibacteroides. The cyclic voltammetry (CV) showed BES with bioaugmentation had the highest activity in reducing p-CNB and hydrogen evolution. Combined with intermediates analysis, bioaugmentation possibly stimulated nitro reduction and hydrodechlorination rate in p-CNB reduction.CONCLUSION: These results demonstrate that BES with P. fluorescens bioaugmentation could serve as a potential treatment process for p-CNB removal. Microbial communitySamples were collected from biofilm on the cathode in BES-I, BES-IP and AEC-I at the end of the experiment using bacterial 16S rDNA sequence analysis on an Illumina platform. The PowerSoil ® J Chem Technol Biotechnol 2020; 95: 274-280

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“…In route A, hydrogen abstraction on amino group occurred, resulting in the formation of anilinyl radical ,, that was rapidly evolved into 4,4′-dichloroazobenzene via dimerization . The subsequent attack of HO· to its diazo group led to the generation of 4-chloronitrobenzene followed by the transformation to PCA through reduction reactions (e.g., e cb – ) , or to 4-chlorophenol due to further oxidation (Figure ). Routes B and C described the cleavage of Cl–C bond, , leading to the production of aniline and 4-aminophenol, respectively, with the concomitant release of Cl – .…”

Section: Resultsmentioning

confidence: 99%

Development of an Electrochemical Ceramic Membrane Filtration System for Efficient Contaminant Removal from Waters

Zheng

Wang

et al. 2018

Environ. Sci. Technol.

129

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Inability to remove low-molecular-weight anthropogenic contaminants is a critical issue in low-pressure membrane filtration processes for water treatment. In this work, a novel electrochemical ceramic membrane filtration (ECMF) system using TiO@SnO-Sb anode was developed for removing persistent p-chloroaniline (PCA). Results showed that the ECMF system achieved efficient removal of PCA from contaminated waters. At a charging voltage of 3 V, the PCA removal rate of TiO@SnO-Sb ECMF system under flow-through mode was 2.4 times that of flow-by mode. The energy consumption for 50% of PCA removal for TiO@SnO-Sb ECMF at 3 V under flow-through mode was 0.38 Wh/L, much lower than that of flow-by operation (1.5 Wh/L), which was attributed to the improved utilization of the surface adsorbed HO· and dissociated HO· driven by the enhanced mass transfer of PCA toward the anode surface. Benefiting from the increased production of reactive oxygen species such as O, HO, and HO· arising from excitation of anatase TiO, TiO@SnO-Sb ECMF exhibited a superior electrocatalytic activity to the SnO-Sb ECMF system. The degradation pathways of PCA initiated by OH· attack were further proposed, with the biodegradable short-chain carboxylic acids (mainly formic, acetic, and oxalic acids) identified as the dominant oxidized products. These results highlight the potential of the ECMF system for cost-effective water purification.

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Catalytic HDC/HDN of 4-chloronitrobenzene in water under ambient-like conditions with Pd supported on pillared clay

Cited by 38 publications

References 34 publications

Deducing kinetic constants for the hydrodechlorination of 4-chlorophenol using high adsorption capacity catalysts

Deducing kinetic constants for the hydrodechlorination of 4-chlorophenol using high adsorption capacity catalysts

Bioaugmentation of p‐chloronitrobenzene in bioelectrochemical systems with Pseudomonas fluorescens

Development of an Electrochemical Ceramic Membrane Filtration System for Efficient Contaminant Removal from Waters

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