In situ observation of H2 dissociation on the ZnO (0001) surface under high pressure of hydrogen using ambient-pressure XPS

Mun, Bongjin Simon; Liu, Zhi; Motin, Abdul; Roy, Probir Chandra; Kim, Chang Min

doi:10.1016/j.ijhydene.2018.03.155

Cited by 28 publications

(28 citation statements)

References 47 publications

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“…Upon heating, surface hydrogen atoms recombinatively desorbed above 450 K (177°C). Mun et al [20] arrived at similar conclusions. Compared with Zn/HZSM-5, the amount of ZnOH + species decreased with the desorption of H 2 O, meanwhile the dissociative adsorption of H 2 resulted in the formation of new ZnOH + on the surface of Zn/HZSM-5 treated with H 2 at 100°C.…”

Section: The Effects Of H 2 Treatment On Zn Species In Zsm-5 Zeolitesmentioning

confidence: 61%

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Evolution of Zn Species on Zn/HZSM‐5 Catalyst under H₂ Pretreated and its Effect on Ethylene Aromatization

et al. 2019

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Aromatization reaction is of importance in producing aromatics, accompanied by the generation of abundant H2, which may influence the reaction by interacting with the catalyst. In this work, Zn‐containing ZSM‐5 prepared by impregnation was treated in H2 atmosphere at different temperatures, and the evolution in structure, acidity, and Zn species distribution were studied. The catalyst's performance in ethylene aromatization was also evaluated. The results show that the H2 atmosphere enabled the reconstruction of ZnO microparticles and the reformation of Brønsted acid sites on Zn/HZSM‐5 below 200 °C. At an elevated temperature (300 °C), Zn+ species were produced by the reduction of [ZnOZn]2+ as confirmed by in‐situ Zn K‐edge extended X‐ray absorption fine structure (EXAFS) study and density functional theory (DFT) calculation. After H2 pretreatment at 300 °C, the increase in the amount of ZnOH+ species increased the selectivity of Zn‐containing ZSM‐5 for aromatics from 62 % to 67 %.

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Section: The Effects Of H 2 Treatment On Zn Species In Zsm-5 Zeolitesmentioning

confidence: 61%

“…Upon heating, surface hydrogen atoms recombinatively desorbed above 450 K (177 °C). Mun et al . arrived at similar conclusions.…”

Section: The Effects Of H2 Treatment On Zn Species In Zsm‐5 Zeolitesmentioning

confidence: 99%

Evolution of Zn Species on Zn/HZSM‐5 Catalyst under H₂ Pretreated and its Effect on Ethylene Aromatization

et al. 2019

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“…6d) can be tted by the Gaussian function with the coincidence of 3 peaks distributed at binding energy of 529.7 eV, 532.26 eV, and 533.75 eV which able to assigned respectively, to metal-O bonds (Fe-O bonds, Zn-O bonds); oxygen defects and oxygen adsorbed on the surface of samples including O 2 , hydroxyl (OH À ) and carbonate (CO 2 3À ) groups (O 2À ). 40,41 Optical and magnetic properties…”

Section: Structural and Morphological Characterizationsmentioning

confidence: 99%

Rational design of magnetically separable core/shell Fe₃O₄/ZnO heterostructures for enhanced visible-light photodegradation performance

Pham

Nguyen

et al. 2021

RSC Adv.

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“…Zinc oxide (ZnO) nanocrystals, which represent typical II–IV group semiconductor nanocrystals with a large band gap, have been widely applied in optics, [1] electronics, [2] catalysis, [3] photoelectrochemical generation, [4] biosensors [5] and energy storage [6] due to their chemical and thermal stability, [7] high carrier mobility, [8] convenient surface tailor ability [9] and low toxicity [10] . The high surface area to volume ratio of ZnO nanocrystals also provides an improved sensitivity over bulk ZnO [11] .…”

Section: Introductionmentioning

confidence: 99%

Pyroelectric Synthesis of the Site‐Specific Au‐ZnO Nanorod Array

Wang

et al. 2021

ChemistrySelect

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This paper introduces an alternative approach for the synthesis of site-specific gold-zinc oxide (Au-ZnO) nanorod array through the pyroelectric approach. The hydrothermally grown ZnO nanorod array on the Si substrate is served as the pyroelectric catalyst. Under rapid temperature oscillation, the gold salt precursor is reduced into gold nanoparticles around the tip of ZnO nanorods in aqueous solution. The hybrid structure shows a significant photoluminescence quenching in the visible emission spectrum of ZnO, which is due to the interaction of ZnO and gold nanoparticles. A Rhodamine B (RhB) degradation test under full spectrum sunlight illumination is conducted to demonstrate the photocatalytic performance of the Au-ZnO nanorod array. The mechanism behind the hydrothermal growth of ZnO, pyroelectric reduction of gold nanoparticles, and photoluminescence quenching of Au-ZnO is discussed. The findings of this work offer possible ways to the sustainable use of thermal energy, including harvesting waste heat through pyroelectric effect, and the site-specific synthesis of various nanomaterials with enhanced photocatalytic degradation capability.

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In situ observation of H2 dissociation on the ZnO (0001) surface under high pressure of hydrogen using ambient-pressure XPS

Cited by 28 publications

References 47 publications

Evolution of Zn Species on Zn/HZSM‐5 Catalyst under H₂ Pretreated and its Effect on Ethylene Aromatization

Evolution of Zn Species on Zn/HZSM‐5 Catalyst under H₂ Pretreated and its Effect on Ethylene Aromatization

Rational design of magnetically separable core/shell Fe₃O₄/ZnO heterostructures for enhanced visible-light photodegradation performance

Pyroelectric Synthesis of the Site‐Specific Au‐ZnO Nanorod Array

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In situ observation of H2 dissociation on the ZnO (0001) surface under high pressure of hydrogen using ambient-pressure XPS

Cited by 28 publications

References 47 publications

Evolution of Zn Species on Zn/HZSM‐5 Catalyst under H2 Pretreated and its Effect on Ethylene Aromatization

Evolution of Zn Species on Zn/HZSM‐5 Catalyst under H2 Pretreated and its Effect on Ethylene Aromatization

Rational design of magnetically separable core/shell Fe3O4/ZnO heterostructures for enhanced visible-light photodegradation performance

Pyroelectric Synthesis of the Site‐Specific Au‐ZnO Nanorod Array

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Evolution of Zn Species on Zn/HZSM‐5 Catalyst under H₂ Pretreated and its Effect on Ethylene Aromatization

Evolution of Zn Species on Zn/HZSM‐5 Catalyst under H₂ Pretreated and its Effect on Ethylene Aromatization

Rational design of magnetically separable core/shell Fe₃O₄/ZnO heterostructures for enhanced visible-light photodegradation performance