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Yahiro, Hidenori; Kyakuno, Taro; Okada, Genji

doi:10.1023/a:1015212123976

Cited by 12 publications

(9 citation statements)

References 17 publications

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“…The CdS particles formed within the pores may aggregate to form larger clusters by a quantum tunneling effect as observed in other porous materials, such as zeolite Y. [68][69][70] Based on our nitrogen adsorption studies, we believe that almost all the CdS particles are located inside the pores of the material; however, we cannot preclude the possibility of some CdS particles that are deposited on the surface of the mesoporous material. This suggests that the formation of CdS particles (clusters) may not occur exclusively within the pores of the MCM-48 matrix.…”

Section: Uv-vis Diffuse Reflectance Spectroscopy (Drs)mentioning

confidence: 88%

Visible light driven photocatalytic evolution of hydrogen from water over CdS encapsulated MCM-48 materials

et al. 2012

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CdS encapsulated cubic MCM-48 mesoporous photocatalysts were prepared by a post-impregnation method. Powder X-ray diffraction (XRD), transmission electron microscopy (TEM), nitrogen adsorption isotherm, UV-visible diffuse reflectance spectroscopy (DRS), FT-IR spectrometry, X-ray photoelectron spectroscopy (XPS), atomic absorption spectroscopy (AAS), and photoluminescence (PL) spectroscopy were employed for the characterization of the CdS incorporated MCM-48 siliceous materials. MCM-48 was loaded with different amounts of CdS. In the current study, all the samples showed photocatalytic activity under visible light (l . 400 nm) irradiation for production of hydrogen from splitting of water in the absence of Pt, which is usually used in photocatalytic splitting of water. The photocatalytic activity of the CdS incorporated MCM-48 mesoporous photocatalysts was found to be dependent on the CdS loading and the pore size of MCM-48 siliceous support. The highest solar hydrogen evolution rate by visible light irradiation from the splitting of water was determined to be 1.81 mmol h 21 g CdS 21 and the apparent quantum yield was estimated to be 16.6%.

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Section: Uv-vis Diffuse Reflectance Spectroscopy (Drs)mentioning

confidence: 88%

Visible light driven photocatalytic evolution of hydrogen from water over CdS encapsulated MCM-48 materials

et al. 2012

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“…Fortunately this can be further reduced without losing any of the essential details arising out of tracker solutions in these Quintessence models. In fact nucleosynthesis places tight constraints on the allowed energy density of any dark energy component, generally forcing them to be negligible in the radiation era [47,48]. The real impact of dark energy occurs after matter-radiation equality, so we can set w r Q = w m Q .…”

Section: Dark Energy Equation Of Statementioning

confidence: 99%

Model independent approach to the dark energy equation of state

2003

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The consensus of opinion in cosmology is that the Universe is currently undergoing a period of accelerated expansion. With current and proposed high precision experiments it offers the hope of being able to discriminate between the two competing models that are being suggested to explain the observations, namely a cosmological constant or a time dependent ''quintessence'' model. The latter suffers from a plethora of scalar field potentials all leading to similar late time behavior of the universe and, hence, to a lack of predictability. In this paper, we develop a model independent approach which simply involves parametrizing the dark energy equation of state in terms of known observables. This allows us to analyze the impact dark energy has had on cosmology without the need to refer to particular scalar field models and opens up the possibility that future experiments will be able to constrain the dark energy equation of state in a model independent manner.

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“…Numerous studies have been conducted on encapsulation of a variety of metal complexes [14,15], clusters [16,17] and organometallic compounds [9,18] in zeolitic hosts. Intensive studies have been considered to improve the catalytic properties for these materials in the oxidation of different types of organic substrates using alternative oxidation processes based on green and non-toxic oxidants.…”

Section: Introductionmentioning

confidence: 99%

Metallo Salicylidenetriazol Complexes Encapsulated in Zeolite-Y: Synthesis, Physicochemical Properties and Catalytic Studies

Abbo

Titinchi

2010

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Chromium(III), zinc(II) and nickel(II) complexes of thio-Schiff base derived from salicylaldehyde and 4-amino-2,4-dihydro-1,2,4-triazole-5-thione have been encapsulated in the nanopores of zeolite-Y by a flexible ligand method. The prepared encapsulated metal complexes have been characterized by surface analysis (XRD and N 2 adsorption/desorption), spectroscopic methods, chemical and thermal analyses. The various techniques of characterization used demonstrated that these complexes were effectively encapsulated in the zeolite supercages without structural modification or loss of crystallinity of the zeolite framework. The encapsulated complexes were screened as heterogeneous catalysts for various oxidation reactions such as phenol, cyclohexene and styrene oxidation, using H 2 O 2 as an oxidant. Under the optimized conditions, these catalysts exhibited high to moderate activity. After a few cycles these catalysts were found to be stable and could be reused after recovering without detectable catalyst leaching or significant loss of activity.

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Untitled

Cited by 12 publications

References 17 publications

Visible light driven photocatalytic evolution of hydrogen from water over CdS encapsulated MCM-48 materials

Visible light driven photocatalytic evolution of hydrogen from water over CdS encapsulated MCM-48 materials

Model independent approach to the dark energy equation of state

Metallo Salicylidenetriazol Complexes Encapsulated in Zeolite-Y: Synthesis, Physicochemical Properties and Catalytic Studies

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