Effect of silver encapsulation on the local structure of titanosilicate ETS-10

Galioglu, Sezin; Zahmakıran, Mehmet; Kalay, Yunus Eren; Özkâr, Saim; Akata, Burcu

doi:10.1016/j.micromeso.2012.04.015

Cited by 18 publications

(16 citation statements)

References 40 publications

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“…13 Insertion of Ca 2+ affects only the bond distances and angles of the portion of the wire in proximity to the cation. Although the inclusion of a single Ru 3+ or Au 3+ cation causes only a minor structural distortion of the wire, the bond length pattern characteristic of the wire is somewhat lost.…”

Section: Resultsmentioning

confidence: 99%

“…13 In this preparation protocol, NaCl and KCl were dissolved in deionized water in a bottle. After dissolving these components, a sodium silicate solution was added and hand-shaken for 5 min, forming the Si precursor solution.…”

Section: Computational and Experimental Detailsmentioning

confidence: 99%

“…In the native form of ETS-10 ((Na,K) 2 TiSi 5 O 13 2,3 ), extraframework Na + and K + cations compensate the two negative charges of each TiO 6 2− unit. As a part of the search for the detailed structure of the material, several theoretical studies have focused on the location of the extra-framework cations.…”

Section: Introductionmentioning

confidence: 99%

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Understanding the Effects of Ion-Exchange in Titanosilicate ETS-10: A Joint Theoretical and Experimental Study

et al. 2014

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Density functional theory (DFT) calculations within the gradient-corrected approximation (GGA) were carried out on two models of Engelhard titanosilicate (ETS-10) with the aim to elucidate the effect of ion exchange on the structural and electronic properties of the Ti−O−Ti quantum wire. The partial and full exchange of Na + cations with alkaline, earth-alkaline, and transition metal ions have been investigated. The theoretical results have been complemented by experimental X-ray diffraction (XRD) and Raman data in the region of the Ti−O−Ti stretching of the wire. Overall, the experimental data support the theoretical findings where substitution of Na + with K + , Ag + , and Ca 2+ cause only minor structural changes in the wire while the inclusion of Zn 2+ , Ru 3+ , and Au 3+ cause its partial or entire disruption.

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Section: Resultsmentioning

confidence: 99%

Section: Computational and Experimental Detailsmentioning

confidence: 99%

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Understanding the Effects of Ion-Exchange in Titanosilicate ETS-10: A Joint Theoretical and Experimental Study

et al. 2014

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“…These effects can be associated with the interaction between the Cu x O nanoparticles and Ti-O-Ti wires in the framework, promoting local electronic change in the ETS-10 titanate chains. 65 To additionally investigate the interaction between the copper oxide nanoparticles and the ETS-10 matrix, we carried out photoluminescence analysis (PL) of the titanosilicate ETS-10, ETS-10/CuO, ETS-10/Cu 2 O materials. The results are discussed in the next section.…”

Section: Raman Spectroscopymentioning

confidence: 99%

ETS‑10 Modified with CuxO Nanoparticles and Their Application for the Conversion of CO2 and Water into Oxygenates

Januario

Nogueira

Pastore

2018

J. Braz. Chem. Soc.

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Photocatalytic reactions to convert CO 2 and H 2 O into solar fuels using only solar irradiation have been investigated in this work. For this purpose, titanosilicate ETS-10 was decorated with Cu 2 O and CuO nanoparticles and their properties were analyzed by different techniques. The final materials were applied in photoreduction of CO 2 in gas phase under 20 h of solar irradiation. In the final, the products oxygen, acetic acid, formaldehyde and methanol were detected by chromatographic techniques. Photoluminescence and electrochemical studies indicate the interaction between Cu x O nanoparticles and Ti-O-Ti-O on the surface of ETS-10, corroborating with the results obtained in the photocatalytic experiments. The best CO 2 photoconversion efficiencies into methanol were obtained when using ETS-10/Cu x O compared to pure ETS-10. Another important finding in this study is the fact that the reactions were carried out in the gas phase and no scavenge donors were employed.Keywords: CO 2 photoreduction, ETS-10 photocatalyst, oxygenated products, copper oxide, solar irradiation IntroductionIn the last 40 years, CO 2 emissions from fossil fuel combustion and industrial processes contributed with about 78% of the total greenhouse gases (GHG) emissions. 1 Different methods to consume CO 2 have been investigated, such as thermochemical conversion, 2-4 electrochemical reduction, [5][6][7] and photocatalytic reduction of CO 2 and water into hydrocarbons or solar fuels. [8][9][10] The use of solar energy has been highlighted as an alternative to obtain clean energy while simultaneously reducing the CO 2 concentration in the atmosphere. 11 Many chemicals are reported to be produced from water and CO 2 : formic acid, 12,13 acetic acid, 14,15 formaldehyde, 16 methanol [17][18][19] and methane. 20,21 Using a combination of metaloxides and co-catalysts we have already demonstrated the feasibility to produce both methane and methanol. 22 The first and principal step in CO 2 reduction is the oxidation of H 2 O molecules into oxygen and protons (equation 1), following the sequence described in equations 1-5. 23 Several works report the conversion to oxygenated chemicals by using sacrificial compounds, such as NaOH, 24 Titanosilicate ETS-10 (Engelhard titanium silicate) was first reported in the literature by Chapman and Roe 28 in 1990, however its structure was elucidated only in 1994 by Anderson et al. 29 using sophisticated techniques as highresolution transmission electron microscopy (HRTEM), nuclear magnetic resonance (NMR) and molecular simulations. The most interesting feature is that the ETS-10 contains a periodic structure of quantum semiconductor wires of [-O-Ti-O-Ti-] formed by TiO 6 octahedra isolated along the structure. The pores (ca. 0.67 nm diameter) run along [100] and [010] directions. [30][31][32][33] These properties make ETS-10 unique, because a short Ti-O bond length (1.71-2.11 Å) along the axial direction would not be possible outside of a zeolite framework. 34 This material absorbs ETS-10 Modified with Cu ...

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“…Because of all these advantages and properties, ETS-10 has recently been used as catalyst support for various processes such as Ag/ETS-10 for aerobic oxidation of diphenyl [6], Cu/ETS-10 for NOx selective catalytic reduction [7], or Rh/ETS-10 for hydroaminomethylation [8], among other applications.…”

Section: Introductionmentioning

confidence: 99%

Influence of La incorporation on the catalytic activity of Ru/ETS-10 catalysts for hydrogen production

Faroldi

Irusta

Cornaglia

2015

Applied Catalysis A: General

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The incorporation of lanthanum on ETS-10 titanosilicate and its influence on the catalytic activity of Ru catalysts for the dry reforming of methane reaction were studied.The catalysts were prepared through ion exchange of ETS-10 using different lanthanum solution concentrations (0.1, 0.2 and 0.4 % wt of La 2 O 3 ). The Ru loading was 0.6 wt.% for all catalysts. The methane reaction rates for Ru/LaETS-10 catalysts showed an increase in comparison with Ru/ETS-10. This could be related to the lanthanum participation in the reaction mechanism. Moreover, all the formulations were stable after 70 h on stream.In order to study the effect of lanthanum exchange in the structure of ETS-10 supports, the solids were characterized by BET, XRD, TEM, FTIR XPS, and Laser Raman spectroscopy.The relative crystallinities were lower than 80%, indicating that the La exchange could have an important effect on the crystalline structure of ETS-10, in agreement with Raman and FTIR results.The surface Ru/Ti ratio determined by XPS was higher in the case of Ru/LaETS-10 synthesized with the highest La concentration in the exchange solution. The Na/Ti ratio, measured by XPS and EDX, was lower for the Ru/LaETS-10 catalysts compared with ETS-10 suggesting that La was exchanged in the structure.

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Effect of silver encapsulation on the local structure of titanosilicate ETS-10

Cited by 18 publications

References 40 publications

Understanding the Effects of Ion-Exchange in Titanosilicate ETS-10: A Joint Theoretical and Experimental Study

Understanding the Effects of Ion-Exchange in Titanosilicate ETS-10: A Joint Theoretical and Experimental Study

ETS‑10 Modified with CuxO Nanoparticles and Their Application for the Conversion of CO2 and Water into Oxygenates

Influence of La incorporation on the catalytic activity of Ru/ETS-10 catalysts for hydrogen production

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