51
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Carrillo P, Shi R, Teeluck K, Senanayake SD, White MG. In Situ Formation of FeRh Nanoalloys for Oxygenate Synthesis. ACS Catal 2018. [DOI: 10.1021/acscatal.8b02235] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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52
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Lustemberg PG, Palomino RM, Gutiérrez RA, Grinter DC, Vorokhta M, Liu Z, Ramírez PJ, Matolín V, Ganduglia-Pirovano MV, Senanayake SD, Rodriguez JA. Direct Conversion of Methane to Methanol on Ni-Ceria Surfaces: Metal–Support Interactions and Water-Enabled Catalytic Conversion by Site Blocking. J Am Chem Soc 2018; 140:7681-7687. [DOI: 10.1021/jacs.8b03809] [Citation(s) in RCA: 100] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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53
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Zhang F, Liu Z, Zhang S, Akter N, Palomino RM, Vovchok D, Orozco I, Salazar D, Rodriguez JA, Llorca J, Lee J, Kim D, Xu W, Frenkel AI, Li Y, Kim T, Senanayake SD. In Situ Elucidation of the Active State of Co–CeOx Catalysts in the Dry Reforming of Methane: The Important Role of the Reducible Oxide Support and Interactions with Cobalt. ACS Catal 2018. [DOI: 10.1021/acscatal.7b03640] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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54
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Luo S, Nguyen-Phan TD, Vovchok D, Waluyo I, Palomino RM, Gamalski AD, Barrio L, Xu W, Polyansky DE, Rodriguez JA, Senanayake SD. Enhanced, robust light-driven H 2 generation by gallium-doped titania nanoparticles. Phys Chem Chem Phys 2018; 20:2104-2112. [PMID: 29302663 DOI: 10.1039/c7cp04155a] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The splitting of water into molecular hydrogen and oxygen with the use of renewable solar energy is considered one of the most promising routes to yield sustainable fuel. Herein, we report the H2 evolution performance of gallium doped TiO2 photocatalysts with varying degrees of Ga dopant. The gallium(iii) ions induced significant changes in the structural, textural and electronic properties of TiO2 nanoparticles, resulting in remarkably enhanced photocatalytic activity and good stability for H2 production. Ga3+ ions can act as hole traps that enable a large number of excited electrons to migrate towards the TiO2 surface, thereby facilitating electron transfer and charge separation. Additionally, the cationic dopant and its induced defects might introduce a mid-gap state, promoting electron migration and prolonging the lifetime of charge carrier pairs. We have discovered that the optimal Ga dopant concentration was 3.125 at% and that the incorporation of platinum (0.5 wt%) as a co-catalyst further improved the H2 evolution rate up to 5722 μmol g-1 h-1. Pt not only acts as an electron sink, drastically increasing the electron/hole pair lifetime, but it also creates an intimate contact at the heterojunction between Pt and Ga-TiO2, thus improving the interfacial electron transfer process. These catalyst design strategies provide new ways of designing transition metal photocatalysts that improve green fuel production from renewable solar energy and water.
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55
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Zhu J, Usov PM, Xu W, Celis-Salazar PJ, Lin S, Kessinger MC, Landaverde-Alvarado C, Cai M, May AM, Slebodnick C, Zhu D, Senanayake SD, Morris AJ. A New Class of Metal-Cyclam-Based Zirconium Metal–Organic Frameworks for CO2 Adsorption and Chemical Fixation. J Am Chem Soc 2018; 140:993-1003. [DOI: 10.1021/jacs.7b10643] [Citation(s) in RCA: 146] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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56
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Zhao B, Yan B, Jiang Z, Yao S, Liu Z, Wu Q, Ran R, Senanayake SD, Weng D, Chen JG. High selectivity of CO2 hydrogenation to CO by controlling the valence state of nickel using perovskite. Chem Commun (Camb) 2018; 54:7354-7357. [DOI: 10.1039/c8cc03829e] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The product selectivity of CO2 hydrogenation can be significantly tuned by controlling the valence state of Ni using perovskites.
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57
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Hamlyn RCE, Mahapatra M, Grinter DC, Xu F, Luo S, Palomino RM, Kattel S, Waluyo I, Liu P, Stacchiola DJ, Senanayake SD, Rodriguez JA. Imaging the ordering of a weakly adsorbed two-dimensional condensate: ambient-pressure microscopy and spectroscopy of CO2 molecules on rutile TiO2(110). Phys Chem Chem Phys 2018; 20:13122-13126. [DOI: 10.1039/c8cp01614c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Disorder–order transitions found for CO2 on titania.
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58
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Hanson J, Senanayake SD, Salazar D, Abeykoon M, Tutuncu G, Yakovenko A. New techniques to determine structural transformations of active catalysts. Acta Crystallogr A Found Adv 2017. [DOI: 10.1107/s2053273317089677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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59
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Liu Z, Lustemberg P, Gutiérrez RA, Carey JJ, Palomino RM, Vorokhta M, Grinter DC, Ramírez PJ, Matolín V, Nolan M, Ganduglia-Pirovano MV, Senanayake SD, Rodriguez JA. In Situ Investigation of Methane Dry Reforming on Metal/Ceria(111) Surfaces: Metal-Support Interactions and C−H Bond Activation at Low Temperature. Angew Chem Int Ed Engl 2017; 56:13041-13046. [DOI: 10.1002/anie.201707538] [Citation(s) in RCA: 97] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Indexed: 11/06/2022]
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60
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Liu Z, Lustemberg P, Gutiérrez RA, Carey JJ, Palomino RM, Vorokhta M, Grinter DC, Ramírez PJ, Matolín V, Nolan M, Ganduglia-Pirovano MV, Senanayake SD, Rodriguez JA. In Situ Investigation of Methane Dry Reforming on Metal/Ceria(111) Surfaces: Metal-Support Interactions and C−H Bond Activation at Low Temperature. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201707538] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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61
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Palomino RM, Ramírez PJ, Liu Z, Hamlyn R, Waluyo I, Mahapatra M, Orozco I, Hunt A, Simonovis JP, Senanayake SD, Rodriguez JA. Hydrogenation of CO2 on ZnO/Cu(100) and ZnO/Cu(111) Catalysts: Role of Copper Structure and Metal–Oxide Interface in Methanol Synthesis. J Phys Chem B 2017; 122:794-800. [DOI: 10.1021/acs.jpcb.7b06901] [Citation(s) in RCA: 95] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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62
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Plonka AM, Wang Q, Gordon WO, Balboa A, Troya D, Guo W, Sharp CH, Senanayake SD, Morris JR, Hill CL, Frenkel AI. In operando studies of Zr-based MOFs as nerve-agent filtration materials. Acta Crystallogr A Found Adv 2017. [DOI: 10.1107/s0108767317097525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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63
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Guild CJ, Vovchok D, Kriz DA, Bruix A, Hammer B, Llorca J, Xu W, El‐Sawy A, Biswas S, Rodriguez JA, Senanayake SD, Suib SL. Water‐Gas‐Shift over Metal‐Free Nanocrystalline Ceria: An Experimental and Theoretical Study. ChemCatChem 2017. [DOI: 10.1002/cctc.201700081] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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64
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Plonka AM, Wang Q, Gordon WO, Balboa A, Troya D, Guo W, Sharp CH, Senanayake SD, Morris JR, Hill CL, Frenkel AI. In Situ Probes of Capture and Decomposition of Chemical Warfare Agent Simulants by Zr-Based Metal Organic Frameworks. J Am Chem Soc 2017; 139:599-602. [DOI: 10.1021/jacs.6b11373] [Citation(s) in RCA: 141] [Impact Index Per Article: 20.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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65
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Rodriguez JA, Grinter DC, Liu Z, Palomino RM, Senanayake SD. Ceria-based model catalysts: fundamental studies on the importance of the metal–ceria interface in CO oxidation, the water–gas shift, CO2 hydrogenation, and methane and alcohol reforming. Chem Soc Rev 2017; 46:1824-1841. [DOI: 10.1039/c6cs00863a] [Citation(s) in RCA: 242] [Impact Index Per Article: 34.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Model metal/ceria and ceria/metal catalysts have shown to be excellent systems for studying fundamental phenomena linked to the operation of technical catalysts.
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66
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Vovchok D, Guild CJ, Llorca J, Xu W, Jafari T, Toloueinia P, Kriz D, Waluyo I, Palomino RM, Rodriguez JA, Suib SL, Senanayake SD. Cu supported on mesoporous ceria: water gas shift activity at low Cu loadings through metal–support interactions. Phys Chem Chem Phys 2017; 19:17708-17717. [DOI: 10.1039/c7cp02378b] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
We synthesized, characterized and tested Cu supported mesoporous CeO2 catalyst for the water-gas shift (WGS) reaction.
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67
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Lustemberg PG, Ramírez PJ, Liu Z, Gutiérrez RA, Grinter DG, Carrasco J, Senanayake SD, Rodriguez JA, Ganduglia-Pirovano MV. Room-Temperature Activation of Methane and Dry Re-forming with CO2 on Ni-CeO2(111) Surfaces: Effect of Ce3+ Sites and Metal–Support Interactions on C–H Bond Cleavage. ACS Catal 2016. [DOI: 10.1021/acscatal.6b02360] [Citation(s) in RCA: 119] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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68
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Zuo Z, Ramírez PJ, Senanayake SD, Liu P, Rodriguez JA. Low-Temperature Conversion of Methane to Methanol on CeOx/Cu2O Catalysts: Water Controlled Activation of the C–H Bond. J Am Chem Soc 2016; 138:13810-13813. [DOI: 10.1021/jacs.6b08668] [Citation(s) in RCA: 90] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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69
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Grinter DC, R Remesal E, Luo S, Evans J, Senanayake SD, Stacchiola DJ, Graciani J, Fernández Sanz J, Rodriguez JA. Potassium and Water Coadsorption on TiO 2(110): OH-Induced Anchoring of Potassium and the Generation of Single-Site Catalysts. J Phys Chem Lett 2016; 7:3866-3872. [PMID: 27631665 DOI: 10.1021/acs.jpclett.6b01623] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Potassium deposition on TiO2(110) results in reduction of the substrate and formation of loosely bound potassium species that can move easily on the oxide surface to promote catalytic activity. The results of density functional calculations predict a large adsorption energy (∼3.2 eV) with a small barrier (∼0.25 eV) for diffusion on the oxide surface. In scanning tunneling microscopy images, the adsorbed alkali atoms lose their mobility when in contact with surface OH groups. Furthermore, K adatoms facilitate the dissociation of water on the titania surface. The K-(OH) species generated are good sites for the binding of gold clusters on the TiO2(110) surface, producing Au/K/TiO2(110) systems with high activity for the water-gas shift.
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70
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Rodriguez JA, Liu P, Graciani J, Senanayake SD, Grinter DC, Stacchiola D, Hrbek J, Fernández-Sanz J. Inverse Oxide/Metal Catalysts in Fundamental Studies and Practical Applications: A Perspective of Recent Developments. J Phys Chem Lett 2016; 7:2627-2639. [PMID: 27327114 DOI: 10.1021/acs.jpclett.6b00499] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Inverse oxide/metal catalysts have shown to be excellent systems for studying the role of the oxide and oxide-metal interface in catalytic reactions. These systems can have special structural and catalytic properties due to strong oxide-metal interactions difficult to attain when depositing a metal on a regular oxide support. Oxide phases that are not seen or are metastable in a bulk oxide can become stable in an oxide/metal system opening the possibility for new chemical properties. Using these systems, it has been possible to explore fundamental properties of the metal-oxide interface (composition, structure, electronic state), which determine catalytic performance in the oxidation of CO, the water-gas shift and the hydrogenation of CO2 to methanol. Recently, there has been a significant advance in the preparation of oxide/metal catalysts for technical or industrial applications. One goal is to identify methods able to control in a precise way the size of the deposited oxide particles and their structure on the metal substrate.
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71
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Flege JI, Höcker J, Kaemena B, Menteş TO, Sala A, Locatelli A, Gangopadhyay S, Sadowski JT, Senanayake SD, Falta J. Growth and characterization of epitaxially stabilized ceria(001) nanostructures on Ru(0001). NANOSCALE 2016; 8:10849-10856. [PMID: 27165117 DOI: 10.1039/c6nr02393b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We have studied (001) surface terminated cerium oxide nanoparticles grown on a ruthenium substrate using physical vapor deposition. Their morphology, shape, crystal structure, and chemical state are determined by low-energy electron microscopy and micro-diffraction, scanning probe microscopy, and synchrotron-based X-ray absorption spectroscopy. Square islands are identified as CeO2 nanocrystals exhibiting a (001) oriented top facet of varying size; they have a height of about 7 to 10 nm and a side length between about 50 and 500 nm, and are terminated with a p(2 × 2) surface reconstruction. Micro-illumination electron diffraction reveals the existence of a coincidence lattice at the interface to the ruthenium substrate. The orientation of the side facets of the rod-like particles is identified as (111); the square particles are most likely of cuboidal shape, exhibiting (100) oriented side facets. The square and needle-like islands are predominantly found at step bunches and may be grown exclusively at temperatures exceeding 1000 °C.
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72
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Liu Z, Grinter DC, Lustemberg PG, Nguyen‐Phan T, Zhou Y, Luo S, Waluyo I, Crumlin EJ, Stacchiola DJ, Zhou J, Carrasco J, Busnengo HF, Ganduglia‐Pirovano MV, Senanayake SD, Rodriguez JA. Dry Reforming of Methane on a Highly‐Active Ni‐CeO
2
Catalyst: Effects of Metal‐Support Interactions on C−H Bond Breaking. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201602489] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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73
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Liu Z, Grinter DC, Lustemberg PG, Nguyen-Phan TD, Zhou Y, Luo S, Waluyo I, Crumlin EJ, Stacchiola DJ, Zhou J, Carrasco J, Busnengo HF, Ganduglia-Pirovano MV, Senanayake SD, Rodriguez JA. Dry Reforming of Methane on a Highly-Active Ni-CeO2 Catalyst: Effects of Metal-Support Interactions on C-H Bond Breaking. Angew Chem Int Ed Engl 2016; 55:7455-9. [PMID: 27144344 DOI: 10.1002/anie.201602489] [Citation(s) in RCA: 210] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2016] [Indexed: 11/11/2022]
Abstract
Ni-CeO2 is a highly efficient, stable and non-expensive catalyst for methane dry reforming at relative low temperatures (700 K). The active phase of the catalyst consists of small nanoparticles of nickel dispersed on partially reduced ceria. Experiments of ambient pressure XPS indicate that methane dissociates on Ni/CeO2 at temperatures as low as 300 K, generating CHx and COx species on the surface of the catalyst. Strong metal-support interactions activate Ni for the dissociation of methane. The results of density-functional calculations show a drop in the effective barrier for methane activation from 0.9 eV on Ni(111) to only 0.15 eV on Ni/CeO2-x (111). At 700 K, under methane dry reforming conditions, no signals for adsorbed CHx or C species are detected in the C 1s XPS region. The reforming of methane proceeds in a clean and efficient way.
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74
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Garrick TR, Diao W, Tengco JM, Stach EA, Senanayake SD, Chen DA, Monnier JR, Weidner JW. The Effect of the Surface Composition of Ru-Pt Bimetallic Catalysts for Methanol Oxidation. Electrochim Acta 2016. [DOI: 10.1016/j.electacta.2016.02.134] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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75
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Liu Z, Duchoň T, Wang H, Grinter DC, Waluyo I, Zhou J, Liu Q, Jeong B, Crumlin EJ, Matolín V, Stacchiola DJ, Rodriguez JA, Senanayake SD. Ambient pressure XPS and IRRAS investigation of ethanol steam reforming on Ni–CeO2(111) catalysts: an in situ study of C–C and O–H bond scission. Phys Chem Chem Phys 2016; 18:16621-8. [DOI: 10.1039/c6cp01212d] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
In situ investigation of the surface chemistry of ethanol steam reforming & metal-oxide interactions over Ni–CeOx(111).
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