Fate of methanol under one-pot artificial photosynthesis condition with metal-loaded TiO2 as photocatalysts

Koirala, Agni Raj; Docao, Son; Lee, Seong Beom; Yoon, Kyung Byung

doi:10.1016/j.cattod.2014.07.056

Cited by 13 publications

(6 citation statements)

References 127 publications

(99 reference statements)

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“…30% higher in comparison with the pristine Aeroxide P25. Similarly, Han et al [16] reported PCA increasing upon loading TiO 2 with semiconductor Cu 2 O NPs However, modification of titania with metal NPs (such as Ag, Au, Pd, Pt, Cu) is known to be much more effective for achievement of PCA in visible range [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

The microstructure effect on the Au/TiO2 and Ag/TiO2 nanocomposites photocatalytic activity

Козлов¹,

Лебедев²,

Polyakov³

et al. 2018

Nanosystems: Phys. Chem. Math.

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In this work the systematic study of the Au/TiO 2 and Ag/TiO 2 nanocomposites was evaluated. Aeroxide P25 preparation was taken as a titania precusor. Composites were obtained using different wet chemistry techniques: impregnation by previously prepared nanoparticles(NPs) sols, in-situ reduction by sodium borohydride, sodium citrate and UV irradiation. The varying of the synthesis method due to the reduction rate differences results in the different interaction between metal NPs and titanium dioxide, and hence different metal/TiO 2 contacts were observed. All the obtained samples were analyzed by XRD, TRS, SEM with EDX and TEM with EDX. According to the statistical analysis of the TEM images the correlation between the metal NPs rate formation and their anisotropy was shown, which may allow us to consider the anisotropy as a descriptor of the contact quality. Combining the results of the optical spectroscopy with the NPs TEM statistical analysis, we confirmed the correlation between observable anisotropy and the contact quality. Finally, the effect of the synthesis method on the photocatalytic activity (PCA) of nanocomposites was shown. Since the work functions of Au and Ag differ, the opposite effects on PCA are expected. Thus, in the case of the Au/TiO 2 nanocomposites, the positive effect associated with NPs anisotropy on the PCA was demonstrated. Alternatively, in the case of the Ag/TiO 2 nanocomposites the PCA evolution was detected only in the case of small NPs formation.

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Section: Introductionmentioning

confidence: 99%

The microstructure effect on the Au/TiO2 and Ag/TiO2 nanocomposites photocatalytic activity

Козлов¹,

Лебедев²,

Polyakov³

et al. 2018

Nanosystems: Phys. Chem. Math.

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“…Other studies introduced gaseous water molecules into the reaction system and found that trace amounts of water could redirect the entire reaction process. For instance, Yoon et al found that the participation of trace water could increase the overall methanol conversion rate by 4 times compared to a no-water system . Yang et al demonstrated that the adsorption mechanisms of multilayer and monolayer water molecules were significantly different.…”

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confidence: 99%

“…For instance, Yoon et al found that the participation of trace water could increase the overall methanol conversion rate by 4 times compared to a no-water system. 7 Yang et al demonstrated that the adsorption mechanisms of multilayer and monolayer water molecules were significantly different. The splitting efficiency of CH 3 OH Ti5c (the CH 3 OH adsorbed on Ti 5c sites) continually decreases with increasing H 2 O coverage because of the hydrogen bonds formed between coadsorbed H 2 O and CH 3 OH Ti5c .…”

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confidence: 99%

Solvent Water Controls Photocatalytic Methanol Reforming

Zhou

Zhang

et al. 2020

J. Phys. Chem. Lett.

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Understanding the role of different solvent molecules for practical solid–liquid heterogeneous photocatalytic reactions is critical for determining the pathway of the reaction. In this study, the operando nuclear magnetic resonance (NMR) method, combined with density functional theory (DFT) calculations, was employed to evaluate the control effect of solvent water in the photocatalytic reforming mechanism of methanol with a Pt-TiO2 catalyst. Results indicate that the presence of water effectively promotes the formation of the HCHO intermediate but inhibits the H2 evolution originating from the switch of the hydrogen source of the H2 formation from CH3OH to H2O. More interestingly, as detected directly in the ab initio molecular dynamics simulation, a small amount of H2O can dissociate, and the evolved −OH species at Ti5c site can greatly reduce the C–H activation barrier of −CH3O, contributing to the formation of oxidation products (e.g., HOCH2OH and CH3OCH2OH) on the Pt-TiO2 surface.

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“…The TiO 2 used in this study was Degussa P25, which consists of anatase and rutile phases with a ratio of 87:13. P25 (3 g) and the procedures to prepare four metal‐doped TiO 2 (M n /TiO 2 , M n = nanoparticles of Pd, Pt, Au, and Cu) are well described in the related literature report 27 . The amount of each metal nanoparticle (M n ) loaded on TiO 2 corresponds to 1 wt%.…”

Section: Methodsmentioning

confidence: 99%

Map of 20 reactions that take place during vapor–solid phase photocatalytic dehydrogenation of ethanol on metal‐loaded TiO₂

Koirala

Thanh

Shaariikhuu

et al. 2023

Bulletin Korean Chem Soc

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We report the map of 20 reactions that take place during vapor-phase photochemical dehydrogenation of ethanol on four metal-doped TiO 2 (M n /TiO 2 , M n = nanoparticles of Pd, Pt, Au, and Cu) under solar simulated light. The reactions are sensitively affected by the moisture amount and the nature of the carrier gas. To construct the above map, we also used CH 3 CHO, CH 3 CO 2 H, (C 2 H 5 O) 2 CHCH 3 , and CH 3 CO 2 C 2 H 5 , respectively, as an independent starting reagent. Amazingly, M n /TiO 2 not only serves as photocatalysts but also as thermocatalysts for various reactions that appear in the above map. The reaction is proposed to proceed by a radical mechanism in which photoinduced electron transfer from the valence band to the conduction band of TiO 2 is the initial step and the subsequent electron injection from organic reactants to the hole in the TiO 2 valence band. This report also features highly valuable unprecedented reactions, which bear great potential to be commercialized.

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Fate of methanol under one-pot artificial photosynthesis condition with metal-loaded TiO2 as photocatalysts

Cited by 13 publications

References 127 publications

The microstructure effect on the Au/TiO2 and Ag/TiO2 nanocomposites photocatalytic activity

The microstructure effect on the Au/TiO2 and Ag/TiO2 nanocomposites photocatalytic activity

Solvent Water Controls Photocatalytic Methanol Reforming

Map of 20 reactions that take place during vapor–solid phase photocatalytic dehydrogenation of ethanol on metal‐loaded TiO₂

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Fate of methanol under one-pot artificial photosynthesis condition with metal-loaded TiO2 as photocatalysts

Cited by 13 publications

References 127 publications

The microstructure effect on the Au/TiO2 and Ag/TiO2 nanocomposites photocatalytic activity

The microstructure effect on the Au/TiO2 and Ag/TiO2 nanocomposites photocatalytic activity

Solvent Water Controls Photocatalytic Methanol Reforming

Map of 20 reactions that take place during vapor–solid phase photocatalytic dehydrogenation of ethanol on metal‐loaded TiO2

Contact Info

Product

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About

Map of 20 reactions that take place during vapor–solid phase photocatalytic dehydrogenation of ethanol on metal‐loaded TiO₂