Novel porous ceramic sheet supported metal reactors for continuous-flow catalysis

Jin, Qijie; Lu, Bingxu; Pan, Youchun; Tao, Xingjun; Himmelhaver, Cindy; Shen, Yuesong; Gu, Sasa; Zeng, Yanwei; Li, Xiujun

doi:10.1016/j.cattod.2019.12.006

Cited by 18 publications

(3 citation statements)

References 60 publications

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“…However, the borohydride hydrolysis reaction (BHR, or hydrogen evolution) in neutral and alkaline solutions is relatively slow and requires catalysts, often M 0 -nanoparticles (M 0 -NPs) [ 4 , 6 , 7 , 8 , 9 , 10 , 11 ]. The same M 0 -NPs are also used as efficient catalysts for many reductions via BH 4 − [ 12 , 13 , 14 , 15 , 16 , 17 , 18 ], including environmentally essential processes [ 9 , 14 , 15 , 16 , 19 , 20 , 21 ]. Thus, catalytic reductions via BH 4 − always compete with catalytic hydrolysis, and a significant excess of BH 4 − is commonly required for efficient reductions [ 16 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

The Competition between 4-Nitrophenol Reduction and BH4− Hydrolysis on Metal Nanoparticle Catalysts

Varshney,

Meyerstein,

Bar-Ziv

et al. 2023

Molecules

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Assessing competitive environmental catalytic reduction processes via NaBH4 is essential, as BH4− is both an energy carrier (as H2) and a reducing agent. A comprehensive catalytic study of the competition between the borohydride hydrolysis reaction (BHR, releasing H2) and 4-nitrophenol reduction via BH4− on M0- and M/M′ (alloy)-nanoparticle catalysts is reported. The results reveal an inverse correlation between the catalytic efficiency for BH4− hydrolysis and 4-nitrophenol reduction, indicating that catalysts performing well in one process exhibit lower activity in the other. Plausible catalytic mechanisms are discussed, focusing on the impact of reaction products such as 4-aminophenol and borate on the rate and yield of BH4− hydrolysis. The investigated catalysts were Ag0, Au0, Pt0, and Ag/Pt-alloy nanoparticles synthesized without any added stabilizer. Notably, the observed rate constants for the 4-nitrophenol reduction on Ag0, Ag-Pt (9:1), and Au0 are significantly higher than the corresponding rate constants for BH4− hydrolysis, suggesting that most reductions do not proceed through surface-adsorbed hydrogen atoms, as observed for Pt0 nanoparticles. This research emphasizes the conflicting nature of BH4− hydrolysis and reduction processes, provides insights for designing improved catalysts for competitive reactions, and sheds light on the catalyst properties required for each specific process.

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Section: Introductionmentioning

confidence: 99%

The Competition between 4-Nitrophenol Reduction and BH4− Hydrolysis on Metal Nanoparticle Catalysts

Varshney,

Meyerstein,

Bar-Ziv

et al. 2023

Molecules

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“…Continuous flow (CF) is an important technique for catalysis, green chemical synthesis, medical, and photothermal applications, because of its high degree of automation, its ease of reaction control, the ability for scale-up reactions, and better reaction reproducibility . These advantages guarantee that CF forms a superior technology for catalysis, compared to traditional batch reactors that face limitations of low efficiency, concentration gradient issues, and poor heat transfer .…”

Section: Introductionmentioning

confidence: 99%

“…Catalyst carriers such as TiO 2 , hydrogel, and inorganic/organic polymers are usually integral components in continuous flow systems . Catalyst carriers provide not only a strategy to immobilize catalysts for multiple instances of usage but also enable uniform distributions of nanocatalysts in porous materials of catalyst carriers, which offers another solution to ensure both high efficiency and reusability of nanocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Facile Synthesis and Integration of Poly(vinyl alcohol) Sponge-Supported Metal Nanocatalysts on a Microfluidic Chip Enable a New Continuous Flow Multireactor Nanocatalysis Platform for High Efficiency and Reusability Catalysis

Lei

Wang

et al. 2022

ACS Sustainable Chem. Eng.

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A new poly(vinyl alcohol) (PVA) sponge-supported nanocatalysis platform on a continuous-flow microfluidic multireactor device was constructed for high-efficiency and high-reusability catalytic degradation of environmental pollutants. PVA sponge-supported metal nanoparticle catalysts (MNPs/PVA) were prepared by a simple improved impregnation self-assembly method, without any complicated surface modification. The MNPs/PVA catalysts were further integrated on a multireactor microfluidic device to form a continuous flow (CF) reactor platform (MNPs/PVA/chip) for simultaneous catalytic degradation of pollutants with two different nanocatalysts. After condition and catalyst optimizations, the catalytic activities of AuNPs/PVA and CoNPs/PVA were evaluated on this continuous flow microfluidic multireactor platform, by using p-nitrophenol (4-NP) as a model organic pollutant. Both catalysts exhibited outstanding catalytic efficiency (e.g., 100% for fresh catalysts), and the strong interactions between MNPs and PVA ensured high reusability (e.g., >20 cycles). After 20 cycles of catalysis, the optimal catalyst AuNPs/PVA still maintained a high catalytic efficiency of 97.6%. Compared to AuNPs/PVA-5, the cost-effective CoNPs/PVA catalyst exhibited similar catalytic performance within the first 10 cycles, while AuNPs/PVA showed better stability for long-term use. Hence, this continuous flow catalytic platform that combines the advantages of porous material-supported nanocatalysts with microfluidic devices has tremendous potential for various cost-effective environmental research and practical applications.

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Study of Pathologies in Alkali-Activated Materials Based on Slag

Marvila¹,

Azevedo²,

Zanelato³

et al. 2021

Characterization of Minerals, Metals, and Materials 2021

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Novel porous ceramic sheet supported metal reactors for continuous-flow catalysis

Cited by 18 publications

References 60 publications

The Competition between 4-Nitrophenol Reduction and BH4− Hydrolysis on Metal Nanoparticle Catalysts

The Competition between 4-Nitrophenol Reduction and BH4− Hydrolysis on Metal Nanoparticle Catalysts

Facile Synthesis and Integration of Poly(vinyl alcohol) Sponge-Supported Metal Nanocatalysts on a Microfluidic Chip Enable a New Continuous Flow Multireactor Nanocatalysis Platform for High Efficiency and Reusability Catalysis

Study of Pathologies in Alkali-Activated Materials Based on Slag

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