Surface modification of CeO2 nanoflakes by low temperature plasma treatment to enhance imine yield: Influences of different plasma atmospheres

Yang, Jingxia; Ding, Huihui; Zhu, Zhu; Wang, Qiuhe; Wang, Jinjie; Xu, Jingli; Chang, Xijiang

doi:10.1016/j.apsusc.2018.05.135

Cited by 30 publications

(19 citation statements)

References 54 publications

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“…5. Ce 3d regions were examined to check Ce 3+ /(Ce 3+ + Ce 4+ ) ratio (shorted as Ce 3+ ratio) based on previous peak fitting methods (Yang et al 2018;Ding et al 2018;Zhang et al 2018), as shown in Fig. 5a.…”

Section: Structure Of Ceo 2 -Mos 2 Composites and Their Catalytic Mechanism In Imine Synthesismentioning

confidence: 99%

“…During the last decade, CeO 2 nanoflakes have attracted much attention due to its oxygen storage and release (Gupta et al 2010;Rohini et al 2017;Anushree and Sharma 2017;Zahoor et al 2018). It has also been proved to be an efficient catalyst for imine synthesis (Zhang et al 2018;Yang et al 2018;Ding et al 2018;Zhang et al 2018;Sudarsanam et al 2016;Geng et al 2016;Tamura and Tomishige 2015), and the oxygen vacancies play an important role in this application (Zhang et al 2018;Ding et al 2018;Yang et al 2016;Zhang et al 2018;Tamura and Tomishige 2015). CeO 2 can easily oxidize benzyl alcohol to benzaldehyde, promoting the formation of N,1-diphenylmethanimine (Zhang et al 2018;Tamura and Tomishige 2015).…”

Section: Introductionmentioning

confidence: 99%

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Structure design of CeO2–MoS2 composites and their efficient activity for imine synthesis

Chen

Jing-jin

et al. 2019

Appl Nanosci

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Imines are important compounds in organic chemistry and polymer chemistry. Nanoflaked CeO 2 -MoS 2 composites, used as the catalyst in the imine synthesis, were synthesized by solvothermal method using calcined CeO 2 nanoflakes as substrate. XPS confirmed that the CeO 2 -MoS 2 (1:2) had the higher Ce 3+ % and the lower Mo 6+ % than the pure CeO 2 or pure MoS 2 , which benefitted the catalytic activity. Meanwhile, the imine conversion proved the excellent catalytic ability of CeO 2 -MoS 2 (1:2), better than pure CeO 2 or MoS 2 . This might be attributed to the heterogeneous junction formed between CeO 2 and MoS 2 , which caused faster Ce 4+ /Ce 3+ transformation (more O*generation) and extra H 2 O consumption.

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Section: Structure Of Ceo 2 -Mos 2 Composites and Their Catalytic Mechanism In Imine Synthesismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Structure design of CeO2–MoS2 composites and their efficient activity for imine synthesis

Chen

Jing-jin

et al. 2019

Appl Nanosci

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“…To further optimize the promoting and/or synergistic effects of oxide supports, several strategies can be utilized to modify or transform the surface structure/composition of supports, including thermal treatment, chemical etching, and ion implantation etc. For example, Yang et al [20] used low temperature plasma treatment to modify the surface structure of CeO 2 nanoflakes and found that the Ce 3 + /Ce 4 + ratio, surface oxygen vacancy concentration and O 2 2À anions content (in peroxide) increased under reducing plasma atmosphere. Konsolakis et al [21] recently reviewed the surface structure modification of CeO 2 by employing advanced preparation methods and modification routes.…”

Section: Introductionmentioning

confidence: 99%

NaBH₄ Surface Modification on CeO₂ Nanorods Supported Transition‐Metal Catalysts for Low Temperature CO Oxidation

2020

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In this report, CeO2 nanorods (CeO2NR) were first chemically etched by different amounts (0.6, 3 and 6 wt %) of NaBH4, which were employed to understand the etching effect on the support structure, surface defects, and reducibility of modified CeO2NR supports. The 6 wt % NaBH4 etched CeO2NR was further used as support materials to load transition‐metals (TM: Cu, Co, Ni, Fe and Mn) catalysts, in order to investigate the support etching effect on the reducibility and catalytic performance of CeO2NR supported TM catalysts. In comparison with the catalytic performance of CeO2NR supported TM catalysts in literature, the 6 wt % NaBH4 etched CeO2NR supported catalysts show clearly enhanced CO oxidation performance at lower temperature, which is mainly attributed to the created surface defects by boron doped CeO2 surface during NaBH4 chemical etching and strong metal‐support interaction.

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“…However, the redox property of ceria is barely used in catalysis of organic reactions at low temperature, [3] even though oxygen vacancies on ceria have been demonstrated to be mobile at room temperature [4] . To enhance the surface redox ability of ceria, various strategies have been used, such as controlling morphology, [5] modulating crystal planes, [6] changing cerium precursors, [7] doping with metals, [8] and treating with plasma atmospheres [9] . It is well known for solid catalysts that high surface area usually means more reactive sites.…”

Section: Introductionmentioning

confidence: 99%

Efficient Imine Formation by Oxidative Coupling at Low Temperature Catalyzed by High‐Surface‐Area Mesoporous CeO₂ with Exceptional Redox Property

Wang

Cao

et al. 2020

Chemistry A European J

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High‐surface‐area mesoporous CeO2 (hsmCeO2) was prepared by a facile organic‐template‐induced homogeneous precipitation process and showed excellent catalytic activity in imine synthesis in the absence of base from primary alcohols and amines in air atmosphere at low temperature. For comparison, ordinary CeO2 and hsmCeO2 after different thermal treatments were also investigated. XRD, N2 physisorption, UV‐Raman, H2 temperature‐programmed reduction, O2 temperature‐programmed desorption, EPR spectroscopy, and X‐ray photoelectron spectroscopy were used to unravel the structural and redox properties. The hsmCeO2 calcined at 400 °C shows the highest specific surface area (158 m2 g−1), the highest fraction of surface coordinatively unsaturated Ce3+ ions (18.2 %), and the highest concentration of reactive oxygen vacancies (2.4×1015 spins g−1). In the model reaction of oxidative coupling of benzyl alcohol and aniline, such an exceptional redox property of the hsmCeO2 catalyst can boost benzylideneaniline formation (2.75 and 5.55 mmol gceria-1 h−1 based on >99 % yield at 60 and 80 °C, respectively) in air with no base additives. It can also work effectively at a temperature of 30 °C and in gram‐scale synthesis. These are among the best results for all benchmark ceria catalysts in the literature. Moreover, the hsmCeO2 catalyst shows a wide scope towards primary alcohols and amines with good to excellent yield of imines. The influence of reaction parameters, the reusability of the catalyst, and the reaction mechanism were investigated.

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Surface modification of CeO2 nanoflakes by low temperature plasma treatment to enhance imine yield: Influences of different plasma atmospheres

Cited by 30 publications

References 54 publications

Structure design of CeO2–MoS2 composites and their efficient activity for imine synthesis

Structure design of CeO2–MoS2 composites and their efficient activity for imine synthesis

NaBH₄ Surface Modification on CeO₂ Nanorods Supported Transition‐Metal Catalysts for Low Temperature CO Oxidation

Efficient Imine Formation by Oxidative Coupling at Low Temperature Catalyzed by High‐Surface‐Area Mesoporous CeO₂ with Exceptional Redox Property

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Surface modification of CeO2 nanoflakes by low temperature plasma treatment to enhance imine yield: Influences of different plasma atmospheres

Cited by 30 publications

References 54 publications

Structure design of CeO2–MoS2 composites and their efficient activity for imine synthesis

Structure design of CeO2–MoS2 composites and their efficient activity for imine synthesis

NaBH4 Surface Modification on CeO2 Nanorods Supported Transition‐Metal Catalysts for Low Temperature CO Oxidation

Efficient Imine Formation by Oxidative Coupling at Low Temperature Catalyzed by High‐Surface‐Area Mesoporous CeO2 with Exceptional Redox Property

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Product

Resources

About

NaBH₄ Surface Modification on CeO₂ Nanorods Supported Transition‐Metal Catalysts for Low Temperature CO Oxidation

Efficient Imine Formation by Oxidative Coupling at Low Temperature Catalyzed by High‐Surface‐Area Mesoporous CeO₂ with Exceptional Redox Property