Selective formation of aromatic amines by selenium-catalyzed reduction of aromatic nitro compounds with CO/H2O under atmospheric pressure

Liu, Xiaozhi; Lü, Shiwei

doi:10.1016/j.molcata.2003.12.004

Cited by 55 publications

(16 citation statements)

References 18 publications

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“…S2) to stable hexagonal using heat treatment . This suggested a solid–liquid–solid phase transformation of catalyst Se . Specifically, Se solid initially dissolved in bisulfite solution.…”

Section: Resultsmentioning

confidence: 99%

Se‐catalyzed process of sodium bisulfite disproportionation

Chai

Yang

Liu

et al. 2015

J of Chemical Tech & Biotech

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BACKGROUND: SO 2 is an important gaseous pollutant that seriously affects the environment and human health. The most common method for SO 2 removal is absorption by NaOH solution and then forming HSO 3 − . Since generation of high-value products and reduction of alkali consumption are important for the economy and practical application, selenium-catalyzed HSO 3 − disproportionation was developed in this study.RESULTS: Selenium decreased the reaction temperature of HSO 3 − disproportionation from >433 K to 343 K. The effects of HSO 3 − concentration, temperature, selenium dosage, and stirring intensity were investigated. Selenium could be used at least five times with stable catalytic performance, indicating satisfactory reusability. More importantly, a catalytic mechanism was proposed using dynamic light scattering, differential scanning calorimetry and UV-visible transmittance spectrophotometry. Results showed that selenium-catalyzed HSO 3 − disproportionation experienced a solid-liquid-solid phase transformation process. During this process, SeSO 3 2− and HSe − were identified as the intermediates. Furthermore, products, i.e. sulfur and sodium bisulfate, were characterized to demonstrate their structure and composition. CONCLUSION: Selenium was an efficient catalyst for HSO 3− disproportionation. This catalytic process offered the advantages of less consumption of alkali and production of high-valuable products, and thus was a potential alternative to other technology for SO 2 removal in practical applications. /jctb As shown in the inset graph, standard HSO 3 − had an obvious characteristic absorption peak at 230-350 nm. However, the peak at 235 nm decreased when reaction time was increased from 10 to

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Section: Resultsmentioning

confidence: 99%

Se‐catalyzed process of sodium bisulfite disproportionation

Chai

Yang

Liu

et al. 2015

J of Chemical Tech & Biotech

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“…have been reported (Liu et al 2004;Hwang et al 2008;Kuroda et al 2008) but application of Pt nanoparticles as catalyst for reduction of nitro compounds has not been reported. Catalytic activity of the prepared colloidal platinum nanoparticles was studied in the reduction reactions of 4-NP and 4-NB-15-C (Figures 5a and 5b) using UV-vis spectrum at different time interval.…”

Section: Reduction Of 4-np and 4-nitrobenzo-15-crown Using Colloidal mentioning

confidence: 99%

“…Many methods have been used for the production of aromatic amino compounds, but they suffer from one or the other disadvantages, for example, catalyst recovery, environmentally harmful, safety, handling problems, etc. (Basu et al 2000;Kumar et al 2001;Liu and Lu 2004). Many researchers used metal nanoparticles as catalysts for the reduction nitro compounds to amino compounds Hwang et al 2008;Chou and Hsieh 2011;Koga and Kitaoka 2011).…”

Section: Introductionmentioning

confidence: 99%

Reduction of 4-Nitrophenol and 4-Nitrobenzo 15 Crown with Colloidal Platinum Nanoparticles Synthesized by Microemulsion Technique

Barad¹,

Chakraborty

2014

Particulate Science and Technology

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Platinum nanoparticles were synthesized by mixing of two micro emulsions. Synthesized platinum nanoparticles were characterized by dynamic light scattering (DLS) and transmission electron microscope (TEM). Nanoparticles stability was analyzed using transmission and backscattering profiles of colloidal platinum solution. Catalytic activity of synthesized colloidal platinum nanoparticles was checked for the reduction of 4-nitrophenol and 4-nitrobenzo 15-crown compound and monitored by ultraviolet-visible absorption spectroscopy. Effects of amount of catalyst and amount of reducing agent were also studied. The reaction was found to follow pseudo-first-order kinetics with respect to nitro compound.

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“…During the reaction process, selenium reacts with sodium borohydride to form H2Se or its anions, which can dissolve in the solvent to form a homogeneous catalytic system. In the system, H2Se or its anions reduces nitrobenzene to aniline and is oxidized to selenium, so the catalytic activities of the recovered selenium are practically the same as those of the fresh catalysts [16].…”

Section: Reusabilitymentioning

confidence: 99%

Reduction of Nitroarenes to Aromatic Amines with Sodium Borohydride in the Presence of Selenium and Actived Carbon

Cai

Zhou

2015

Bull. Chem. React. Eng. Catal.

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A selenium and actived carbon (AC) catalyst has been applied for the selective reduction of nitroarenes to their corresponding amines respectively using sodium borohydride (NaBH4) as a reducing source under mild conditions. Under the optimized conditions, efficient and selective reduction of nitroarenes into the corresponding aromatic amines occurred over a recyclable selenium catalyst. The catalyst can be easily recovered after catalytic reaction and readily reused for 4 cycles with consistent activity hence reduces the cost of the catalyst.

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Selective formation of aromatic amines by selenium-catalyzed reduction of aromatic nitro compounds with CO/H2O under atmospheric pressure

Cited by 55 publications

References 18 publications

Se‐catalyzed process of sodium bisulfite disproportionation

Se‐catalyzed process of sodium bisulfite disproportionation

Reduction of 4-Nitrophenol and 4-Nitrobenzo 15 Crown with Colloidal Platinum Nanoparticles Synthesized by Microemulsion Technique

Reduction of Nitroarenes to Aromatic Amines with Sodium Borohydride in the Presence of Selenium and Actived Carbon

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