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273 results on '"Mu, Rentao"'

10. Iso-oriented monolayer {\alpha}-MoO3(010) films epitaxially grown on SrTiO3(001)

Author

Du, Yingge, Li, Guoqiang, Peterson, Erik W., Zhou, Jing, Zhang, Xin, Mu, Rentao, Dohnálek, Zdenek, Bowden, Mark, Lyubinetsky, Igor, and Chambers, Scott A.

Subjects
Condensed Matter - Materials Science, Condensed Matter - Mesoscale and Nanoscale Physics, Physics - Chemical Physics
Abstract

The ability to synthesis well-ordered two-dimensional materials under ultra-high vacuum and directly characterize them by other techniques in-situ can greatly advance our current understanding on their physical and chemical properties. In this paper, we demonstrate that iso-oriented {\alpha}-MoO3 films with as low as single monolayer thickness can be reproducibly grown on SrTiO3(001) (STO) substrates by molecular beam epitaxy ( (010)MoO3 || (001)STO, [100]MoO3 || [100]STO or [010]STO) through a self-limiting process. While one in-plane lattice parameter of the MoO3 is very close to that of the SrTiO3 (aMoO3 = 3.96 {\AA}, aSTO = 3.905 {\AA}), the lattice mismatch along other direction is large (~5%, cMoO3 = 3.70 {\AA}), which leads to relaxation as clearly observed from the splitting of streaks in reflection high-energy electron diffraction (RHEED) patterns. A narrow range in the growth temperature is found to be optimal for the growth of monolayer {\alpha}-MoO3 films. Increasing deposition time will not lead to further increase in thickness, which is explained by a balance between deposition and thermal desorption due to the weak van der Waals force between {\alpha}-MoO3 layers. Lowering growth temperature after the initial iso-oriented {\alpha}-MoO3 monolayer leads to thicker {\alpha}-MoO3(010) films with excellent crystallinity., Comment: One supporting figure is attached at the end of the manuscript

Published
2015
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33. Enhanced Methanol Synthesis over Self‐Limited ZnOx Overlayers on Cu Nanoparticles Formed via Gas‐Phase Migration Route.

Author

Song, Tongyuan, Li, Rongtan, Wang, Jianyang, Dong, Cui, Feng, Xiaohui, Ning, Yanxiao, Mu, Rentao, and Fu, Qiang

Subjects
COPPER, ATMOSPHERIC carbon dioxide, METAL catalysts, METHANOL, OXIDATION-reduction reaction
Abstract

Supported metal catalysts are widely used for chemical conversion, in which construction of high density metal‐oxide or oxide‐metal interface is an important means to improve their reaction performance. Here, Cu@ZnOx encapsulation structure has been in situ constructed through gas‐phase migration of Zn species from ZnO particles onto surface of Cu nanoparticles under CO2 hydrogenation atmosphere at 450 °C. The gas‐phase deposition of Zn species onto the Cu surface and growth of ZnOx overlayer is self‐limited under the high temperature and redox gas (CO2/H2) conditions. Accordingly, high density ZnOx‐Cu interface sites can be effectively tailored to have an enhanced activity in CO2 hydrogenation to methanol. This work reveals a new route for the construction of active oxide‐metal interface and classic strong metal‐support interaction state through gas‐phase migration of support species induced by high temperature redox reaction atmosphere. [ABSTRACT FROM AUTHOR]

Published
2024
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35. Activating lattice oxygen of single-layer ZnO for the catalytic oxidation reaction.

Author

Liu, Changping, Lin, Le, Wu, Hao, Liu, Yijing, Mu, Rentao, and Fu, Qiang

Abstract

Tuning an oxide/metal interface is of critical importance for the performance enhancement of many heterogeneous catalytic reactions. However, catalytic oxidation occurring at the interface between non-reducible oxide and metal has been challenging, since non-reducible oxides hardly lose their lattice oxygen (OL) or dissociate O2 from the gas phase. In this work, a ZnO monolayer film on Au(111) is used as an inverse catalyst to investigate CO oxidation occurring at the ZnO/Au(111) interface via high pressure scanning tunneling microscopy. Surface science experiments indicate that oxygen intercalation under the ZnO monolayer film, termed ZnO/O/Au(111), can be achieved via a surface reaction with 1 × 10−6 mbar O3. Subsequent exposure of the formed ZnO/O/Au(111) surface to mbar CO at room temperature leads to the recovery of the pristine ZnO/Au(111) surface. Theoretical calculations reveal that OL adjacent to intercalated oxygen (Oint) is activated due to the OL–Zn–Oint bonding and surface corrugation, which can be directly involved in CO oxidation. Subsequently, Oint migrates to the formed oxygen vacancy from the subsurface resuming the pristine ZnO structure. These results thus reveal that oxygen intercalation underneath single-layer ZnO will strongly boost the oxidation reaction via activating adjacent lattice oxygen atoms. [ABSTRACT FROM AUTHOR]

Published
2023
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36. Graphene cover-promoted metal-catalyzed reactions

Author

Yao, Yunxi, Fu, Qiang, Zhang, Y. Y., Weng, Xuefei, Li, Huan, Chen, Mingshu, Jin, Li, Dong, Aiyi, Mu, Rentao, Jiang, Peng, Liu, Li, Bluhm, Hendrik, Liu, Zhi, Zhang, S. B., and Bao, Xinhe

Published
2014

39. Effects of water adsorption on active site-dependent H2 activation over MgO nanoflakes.

Author

Dong, Aiyi, Li, Kun, Mu, Rentao, Liu, Conghui, Li, Rongtan, Jia, Haoran, Lin, Le, and Fu, Qiang

Subjects
ADSORPTION (Chemistry), MAGNESIUM oxide, FOURIER transforms, NANOPARTICLES, DESORPTION
Abstract

Understanding the effect of H2O adsorption on reactant activation is of great importance in heterogeneous catalysis, which remains a grand challenge particularly in oxide catalyst systems with structural complexity. Herein, the effect of D2O adsorption on D2 activation over MgO nanocatalysts at different temperatures has been investigated by transmission Fourier transform infrared (FT-IR) and temperature-programmed desorption (TPD). Two sets of hydride and hydroxyl species produced from D2 dissociation at more active and less active Mg-O pairs can be observed by FT-IR, which all desorb via the product of D2 as confirmed by TPD experiments. We find that the physically adsorbed D2O overlayer does not affect the dissociation of D2 since D2 may pass through the molecular layer and access the surface-active sites. When D2O is partially dissociated on the MgO surface, D2 can only dissociate at the remaining active sites until that dissociated −ODw groups from D2O occupy all active sites. These findings provide a fundamental understanding of the effect of water adsorption on D2 activation on oxide catalysts. [ABSTRACT FROM AUTHOR]

Published
2023
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47. Hydroxyl-mediated ethanol selectivity of CO2 hydrogenation† †Electronic supplementary information (ESI) available: Experimental details and supporting figures and tables. See DOI: 10.1039/c8sc05608k

Author

Yang, Chengsheng, Mu, Rentao, Wang, Guishuo, Song, Jimin, Tian, Hao, Zhao, Zhi-Jian, and Gong, Jinlong

Subjects
inorganic chemicals, Chemistry
Abstract

This paper describes the promotional effect of hydroxyl groups over RhFeLi/TiO2 catalysts for the ethanol synthesis via CO2 hydrogenation., Oxide-supported Rh nanoparticles have been widely used for CO2 hydrogenation, especially for ethanol synthesis. However, this reaction operates under high pressure, up to 8 MPa, and suffers from low CO2 conversion and alcohol selectivity. This paper describes the crucial role of hydroxyl groups bound on Rh-based catalysts supported on TiO2 nanorods (NRs). The RhFeLi/TiO2 NR catalyst shows superior reactivity (≈15% conversion) and ethanol selectivity (32%) for CO2 hydrogenation. The promoting effect can be attributed to the synergism of high Rh dispersion and high-density hydroxyl groups on TiO2 NRs. Hydroxyls are proven to stabilize formate species and protonate methanol, which is easily dissociated into *CHx, and then CO obtained from the reverse water–gas shift reaction (RWGS) is inserted into *CHx to form CH3CO*, followed by CH3CO* hydrogenation to ethanol.

Published
2019

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