Synergic effect between gold and vanadate substituted hydroxyapatite support for synthesis of methyl methacrylate by one-step oxidative esterification

Li, Jie; Li, Huayin; Liu, Zongyang; Akri, Mohcin; Tan, Yuan; Kang, Leilei; Chen, Jun; Qiao, Botao; Ding, Yunjie

doi:10.1016/j.cej.2021.133207

Cited by 13 publications

(24 citation statements)

References 61 publications

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“…Two new peaks emerged at 1231 and 1384 cm −1 , which were ascribed to bending vibrations of CH 3 and C–O–C species in the ester, respectively. 39,40 At the high temperature (Fig. 11c), the bands at 1550, 1647, and 1703 cm −1 could be observed, and the band at 1630 cm −1 was totally missing.…”

Section: Resultsmentioning

confidence: 97%

Ionic liquid-mediated hexagonally porous ZnO nanocrystal-supported Au catalysts: highly stable materials for aldehyde oxidative esterification

Zheng

Yang

Chen

et al. 2023

Catal. Sci. Technol.

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Section: Resultsmentioning

confidence: 97%

Ionic liquid-mediated hexagonally porous ZnO nanocrystal-supported Au catalysts: highly stable materials for aldehyde oxidative esterification

Zheng

Yang

Chen

et al. 2023

Catal. Sci. Technol.

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“…The IR spectra show clearly the functional groups contained in these materials, e.g., −OH stretching vibrations at the peaks around 2800–3500 cm –1 and 820 cm –1 ; C≡N stretch around 2338–2360 cm –1 ; and C=O/CO 3 2– IR absorption around 1414–1428 cm –1 , respectively. 29 , 30 A peak around 506 cm –1 shows the formation of Zr–O. The IR peak intensity of C=O/CO 3 2– decreases with the sintering of BZF and for the heterostructure of CeO 2−δ /BZY.…”

Section: Resultsmentioning

confidence: 98%

Designing High Interfacial Conduction beyond Bulk via Engineering the Semiconductor–Ionic Heterostructure CeO_2−δ/BaZr_0.8Y_0.2O₃ for Superior Proton Conductive Fuel Cell and Water Electrolysis Applications

Xing

Liu

Chen

et al. 2022

ACS Appl. Energy Mater.

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Proton ceramic fuel cells (PCFCs) are an emerging clean energy technology; however, a key challenge persists in improving the electrolyte proton conductivity, e.g., around 10–3–10–2 S cm–1 at 600 °C for the well-known BaZr0.8Y0.2O3 (BZY), that is far below the required 0.1 S cm–1. Herein, we report an approach for tuning BZY from low bulk to high interfacial conduction by introducing a semiconductor CeO2−δ forming a semiconductor–ionic heterostructure CeO2−δ/BZY. The interfacial conduction was identified by a significantly higher conductivity obtained from the BZY grain boundary than that of the bulk and a further improvement from the CeO2−δ/BZY which achieved a remarkably high proton conductivity of 0.23 S cm–1. This enabled a high peak power of 845 mW cm–2 at 520 °C from a PCFC using the CeO2−δ/BZY as the electrolyte, in strong contrast to the BZY bulk conduction electrolyte with only 229 mW cm–2. Furthermore, the CeO2−δ/BZY fuel cell was operated under water electrolysis mode, exhibiting a very high current density output of 3.2 A cm–2 corresponding to a high H2 production rate, under 2.0 V at 520 °C. The band structure and a built-in-field-assisted proton transport mechanism have been proposed and explained. This work demonstrates an efficient way of tuning the electrolyte from low bulk to high interfacial proton conduction to attain sufficient conductivity required for PCFCs, electrolyzers, and other advanced electrochemical energy technologies.

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“…The reaction was carried out under neutral conditions with a MAL conversion of 58% and MMA selectivity of 98% . After this, a variety of materials were adopted to support Au nanoparticles, such as La 2 O 3 , ZnO, , MgO, CeO 2 , Ce 0.6 Zr 0.4 O 2 , , and HVP . However, most of the catalysts could not achieve both high reactivity and selectivity, and most reactions also required a large amount of catalyst.…”

Section: Introductionmentioning

confidence: 99%

“…12 After this, a variety of materials were adopted to support Au nanoparticles, such as La 2 O 3 , 13 ZnO, 14,15 MgO, 16 CeO 2 , 14 Ce 0.6 Zr 0.4 O 2 , 17,18 and HVP. 19 However, most of the catalysts could not achieve both high reactivity and selectivity, and most reactions also required a large amount of catalyst. For comparison, the performance of catalysts in recent years is listed in Table S1.…”

Section: Introductionmentioning

confidence: 99%

Au Nanoparticle Catalysts on NiO-Decorated MgO–Al₂O₃ Supports for Efficient Oxidative Esterification of Methylacrolein to Methyl Methacrylate

Miao

Song

et al. 2023

ACS Appl. Nano Mater.

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Supported Au catalysts have been the focus of oxidation esterification of methylacrolein (MAL) to methyl methacrylate (MMA) in recent years, but most of them have difficulty in achieving both high conversion and high selectivity.Here, we report an easily prepared catalyst-loaded Au on NiOdecorated MgO−Al 2 O 3 , using which resulted in 97.7% MAL conversion and 91.9% MMA selectivity. XPS showed that Au existed mainly as Au 0 , while Ni existed as NiO. The addition of appropriate amounts of Ni reduced the binding energy of Au and the percentage of Au δ+ and enhanced the interaction between Au and the support, so as to obtain high reaction activity. In situ FTIR showed that the high selectivity for MMA formation was attributed to a special η 1 -(C,O) mode. Furthermore, the mechanism of the reaction was deduced from the above experimental results and different adsorption modes. We anticipate that the results provide ideas for the design of oxidation esterification catalysts.

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Synergic effect between gold and vanadate substituted hydroxyapatite support for synthesis of methyl methacrylate by one-step oxidative esterification

Cited by 13 publications

References 61 publications

Ionic liquid-mediated hexagonally porous ZnO nanocrystal-supported Au catalysts: highly stable materials for aldehyde oxidative esterification

Ionic liquid-mediated hexagonally porous ZnO nanocrystal-supported Au catalysts: highly stable materials for aldehyde oxidative esterification

Designing High Interfacial Conduction beyond Bulk via Engineering the Semiconductor–Ionic Heterostructure CeO_2−δ/BaZr_0.8Y_0.2O₃ for Superior Proton Conductive Fuel Cell and Water Electrolysis Applications

Au Nanoparticle Catalysts on NiO-Decorated MgO–Al₂O₃ Supports for Efficient Oxidative Esterification of Methylacrolein to Methyl Methacrylate

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Synergic effect between gold and vanadate substituted hydroxyapatite support for synthesis of methyl methacrylate by one-step oxidative esterification

Cited by 13 publications

References 61 publications

Ionic liquid-mediated hexagonally porous ZnO nanocrystal-supported Au catalysts: highly stable materials for aldehyde oxidative esterification

Ionic liquid-mediated hexagonally porous ZnO nanocrystal-supported Au catalysts: highly stable materials for aldehyde oxidative esterification

Designing High Interfacial Conduction beyond Bulk via Engineering the Semiconductor–Ionic Heterostructure CeO2−δ/BaZr0.8Y0.2O3 for Superior Proton Conductive Fuel Cell and Water Electrolysis Applications

Au Nanoparticle Catalysts on NiO-Decorated MgO–Al2O3 Supports for Efficient Oxidative Esterification of Methylacrolein to Methyl Methacrylate

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Designing High Interfacial Conduction beyond Bulk via Engineering the Semiconductor–Ionic Heterostructure CeO_2−δ/BaZr_0.8Y_0.2O₃ for Superior Proton Conductive Fuel Cell and Water Electrolysis Applications

Au Nanoparticle Catalysts on NiO-Decorated MgO–Al₂O₃ Supports for Efficient Oxidative Esterification of Methylacrolein to Methyl Methacrylate