Catalytic performance promoted on Pt-based diesel oxidation catalyst assisted by polyvinyl alcohol

Liang, Yanli; Ding, Xinmei; Wang, Jianli; Zhao, Ming; Dan, Yi; Jiang, Long; Chen, Yaoqiang

doi:10.1007/s11356-020-09974-9

Cited by 9 publications

(6 citation statements)

References 42 publications

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“…The PANI coating on the Pt induced electronic interactions between the Pt surface and the PANI ligand, thus increasing the Pt NP activity and stability for the ORR . A similar electronic interaction was also observed between PVA and Pt NPs . The higher activities of Au clusters modified by the PVP ligand toward alcohol oxidation has been ascribed to electron donation from PVP to Au .…”

Section: The Beneficial Effects Of Ligands For Nanocatalysismentioning

confidence: 67%

“…214 A similar electronic interaction was also observed between PVA and Pt NPs. 215 The higher activities of Au clusters modified by the PVP ligand toward alcohol oxidation has been ascribed to electron donation from PVP to Au. 216 The enriched electron density of the Au core was confirmed on the basis of different techniques.…”

Section: The Beneficial Effects Of Ligands For Nanocatalysismentioning

confidence: 99%

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The Critical Impacts of Ligands on Heterogeneous Nanocatalysis: A Review

2021

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Ligand utilization is a necessary and powerful technique for the colloidal synthesis of nanoparticles (NPs) with controllable sizes and regulated morphologies. For catalysis applications, it is commonly believed that surface ligands on metal NPs block the active catalytic sites and reduce the catalytic activity. Nevertheless, since 2010, an increasing number of research groups have demonstrated the unexpected benefits of ligands that improve catalytic activity and/or selectivity. These benefits can be ascribed to the construction of an inorganic−organic interface, through which a series of factors, such as steric, electronic, and solubility effects, can be utilized to produce favorable changes to the interfacial environment. Considering the tremendous number of developments in this emerging research field, it is necessary to compile a comprehensive and systematic overview of recent advances. In this Review, we summarize the critical impacts of ligands on heterogeneous nanocatalysis. First, we introduce the vital roles of ligands in colloid syntheses for controllable sizes and regulated shapes. Second, the detrimental effects of ligands for nanocatalysis are described on the basis of traditional views. Third, a series of strategies for ligand removal are reviewed and compared. Fourth, on the basis of research that has been conducted in the past decade, the three main beneficial ligand effects (steric, electronic, and solubility) on heterogeneous nanocatalysis are classified and discussed. For each effect, the possible corresponding beneficial mechanism is presented, and typical examples are provided. Recent advances regarding density functional theory (DFT) calculations and the regulation of ligand surface coverage have been dedicated to explaining the ligand-promotion mechanism in nanocatalysis and searching for optimal nanocatalysts. Fifth, the stabilities of cutting-edge ligand-capped nanocatalysts before and after catalytic reactions are discussed. Finally, we highlight the remaining challenges and propose future perspectives. Although much progress has been achieved, the impacts of ligands on the catalytic activities of nanocatalysts are multifaceted and still debatable. We hope this Review will deepen readers' understanding of the actual impacts ligands have on heterogeneous catalysis.

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Section: The Beneficial Effects Of Ligands For Nanocatalysismentioning

confidence: 67%

Section: The Beneficial Effects Of Ligands For Nanocatalysismentioning

confidence: 99%

The Critical Impacts of Ligands on Heterogeneous Nanocatalysis: A Review

2021

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“…The first weight loss stage is at 235–368°C, and the maximum weight loss rate is at 295°C. This stage corresponds to the dehydroxylation and dehydrogenation of the PVA main chain to form a conjugated double bond 54 . The second stage begins at 368°C, and the weight loss rate reaches the highest at 414°C, and then the weight loss rate drops to the lowest near 448°C.…”

Section: Resultsmentioning

confidence: 99%

“…It can be seen that there are three stages on the PVA-g-APEG graft copolymer curve after 200 C. The first weight loss stage is at 235-368 C, and the maximum weight loss rate is at 295 C. This stage corresponds to the dehydroxylation and dehydrogenation of the PVA main chain to form a conjugated double bond. 54 The second stage begins at 368 C, and the weight loss rate reaches the highest at 414 C, and then the weight loss rate drops to the lowest near 448 C. This stage decomposes the APEG branch chain as well as the carbon chain and conjugated double bonds on the PVA main chain. 55,56 The final step is caused by the decomposition of the PVA main chain, which occurs at 448-510 C. 57 The PVA-g-APEG graft copolymer weight loss temperature and loss rate are still between APEG and PVA, and it has good thermal stability.…”

Section: The Crystallization Properties Of Pva-g-apeg Graft Copolymermentioning

confidence: 99%

A novel biomedical compatibilizer (polyvinyl alcohol‐allyl polyethylene glycol graft copolymer) for polyvinyl alcohol/polyethylene oxide composite system

Yang

Guo

Zhang

et al. 2022

J of Applied Polymer Sci

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Due to biocompatibility and similar extracellular matrix structure, polyvinyl alcohol (PVA)/polyethylene oxide (PEO) nanofiber membranes are an essential medical dressing. However, the phase separation of the PVA/PEO composite system will occur within a short time. It severely limits the continuous preparation of PVA/PEO nanofiber membranes. To make PVA/PEO composite system maintain compatibility, a novel polyvinyl alcohol-allyl polyethylene glycol (PVA-g-APEG) graft copolymer with phase change, compatibilization and biocompatibility was prepared successfully. Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) prove that the copolymerization and alcoholysis reaction allyl polyethylene glycol (APEG) and vinyl acetate (VAc) successfully obtained PVA-g-APEG graft copolymer. The prepared PVA-g-APEG not only has electrospinability but can effectively prevent the phase separation of PVA/PEO composite system, which ensures the continuity of electrospinning in the industry. Additionally, the feasibility of the PVAg-APEG compatibilized PVA/PEO composite system for application in biomedical was verified through the preparation and various assessments of PVA-g-APEG/PVA/PEO nanofiber dressings. The prepared PVA-g-APEG is beneficial to the PVA/PEO composite system to broaden its application in biomedical and other fields.

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“…The DOC oxidizes CO [20], HC [21], and the organic fraction of diesel particles to harmless water and CO 2 . In addition, it also oxidizes nitric oxide (NO) to nitrogen dioxide (NO 2 ) [22]. It promotes continuous regeneration of downstream diesel particulate filters and improves the conversion efficiency of NO x via selective catalytic reduction at low temperatures [23].…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Mixture Ratios of Methanol-Diesel on the Performance Enhancement and Emission Reduction for a Diesel Engine

Zhang

Tian

et al. 2021

Processes

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To improve the combustion and emission characteristics of diesel engines, methanol-diesel fuels with different mixing ratios (DM0, DM10, DM20, DM30, and DM40) were used to investigate the effects of methanol addition on the combustion and emission of a four-stroke diesel engine in terms of cylinder pressure, brake power, brake-specific fuel consumption, and nitrogen oxides, soot, and carbon monoxide emissions. Firstly, an improved entire diesel engine model was developed using AVL-BOOST software and validated by the experimental results. The results showed that the increase of methanol content in the fuel mixture had a negative impact on the performance characteristic of the diesel engine, but significantly improved the emission characteristic of the diesel engine. With the methanol ratio in the mixed fuel increased to 10%, 20%, 30%, and 40%, the cylinder pressure of the engine increased by 0.89%, 1.48%, 2.29%, and 3.17%, respectively. However, the power decreased by 3.76%, 6.74%, 11.35%, and 15.45%, the torque decreased by 3.76%, 6.74%, 11.35%, and 15.45%, respectively, and the brake specific fuel consumption increased by 3.77%, 6.92%, 12.33%, and 17.61%, respectively. In addition, with the methanol ratio in the mixed fuel increased to 10%, 20%, 30%, and 40%, the carbon monoxide emission decreased by 21.32%, 39.04%, 49.81%, and 56.59% and the soot emission decreased by 0.25%, 8.69%, 16.81%, and 25.28%, respectively. Therefore, the addition of methanol to the fuel can improve the combustion and emission characteristics of the engine.

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Catalytic performance promoted on Pt-based diesel oxidation catalyst assisted by polyvinyl alcohol

Cited by 9 publications

References 42 publications

The Critical Impacts of Ligands on Heterogeneous Nanocatalysis: A Review

The Critical Impacts of Ligands on Heterogeneous Nanocatalysis: A Review

A novel biomedical compatibilizer (polyvinyl alcohol‐allyl polyethylene glycol graft copolymer) for polyvinyl alcohol/polyethylene oxide composite system

Effects of Different Mixture Ratios of Methanol-Diesel on the Performance Enhancement and Emission Reduction for a Diesel Engine

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