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Chemoselective reduction of [small alpha],[small beta]-unsaturated aldehydes using an unsupported nanoporous gold catalyst

15-10-2014 | Balaram S. Takale; Shanqiang Wang; Xuan Zhang; Xiujuan Feng; Xiaoqiang Yu; Tienan Jin; Ming Bao; Yoshinori Yamamoto, Chemical Communication, 2014

The remarkable effect of an unsupported nanoporous gold catalyst (AuNPore) on chemoselective hydrogenation of α,β-unsaturated aldehydes using silane has been described. Enals can be reduced with excellent selectivity, giving the corresponding allylic alcohols in good to high chemical yields.

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In situ Nd isotope analyses in geological materials with signal enhancement and non-linear mass dependent fractionation reduction using laser ablation MC-ICP-MS

15-10-2014 | Lei Xu; zhaochu hu; Wen Zhang; Lu Yang; Yongsheng Liu; Shan Gao; Tao Luo; S. H. Hu, Journal of Analytical Atomic Spectrometry, 2014

In this study, we investigated the effects of three different cone combinations and the addition of N2 with the guard electrode either grounded or floating on the performance of Nd isotope analyses. Signal enhancements (2.5-3 folds) were observed for the Jet sample cone + X skimmer cone and for ...

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Controllable synthesis of Ni/SiO2 hollow spheres and their excellent catalytic performance in 4-nitrophenol reduction

15-10-2014 | Zhongyi Niu; Shenghuan Zhang; Yanbo Sun; Shili Gai; Fei He; Yunlu Dai; Lei Li; Piaoping Yang, Dalton Transactions, 2014

The high cost of noble metal nanoparticles used for catalytic reduction of 4-nitrophenol (4-NP) leads to an extensive study of Ni nanoparticles (NPs) for their low cost and magnetic properties. However, the conventional routes for preparing the ferromagnetic Ni NPs usually lead to large particle ...

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Nanocoaxes for optical and electronic devices

15-10-2014 | Binod Rizal; Juan M. Merlo; Michael J. Burns; Thomas C. Chiles; Michael J. Naughton, Analyst, 2014

The evolution of micro/nanoelectronics technology, including the shrinking of devices and integrated circuit components, has included the miniaturization of linear and coaxial structures to micro/nanoscale dimensions. This reduction in the size of coaxial structures may offer advantages to ...

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Wastewater remediation using a spiral shaped reactor for photochemical reduction of hexavalent chromium

14-10-2014 | Tiele Caprioli Machado; Marla Azário Lansarin; Camila Silva Ribeiro, Photochemical & Photobiological Sciences, 2014

The hexavalent chromium contained in wastewater of some industries is toxic to most microorganisms and potentially harmful to human health. The application of photochemical reduction of Cr(VI) in the treatment of wastewater from the electroplating industry was studied, and a continuous reactor in ...

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Chemically-induced redox switching of a metalloprotein reveals thermodynamic and kinetic heterogeneity, one molecule at a time

14-10-2014 | Namik Akkilic; Fenna van der Grient; Muhammad Kamran; Nusrat J. M. Sanghamitra, Chemical Communication, 2014

Oxidation (off state) and reduction (on state) of a single azurin molecule is monitored, one electron at a time, which depend on the chemical redox potential. By analysing the fluorescence time traces from individual azurin molecules, reaction kinetics and redox thermodynamics were determined.

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Iron-catalyzed graphitization of biomass

14-10-2014 | Emma Thompson; Ashleigh Danks; Laurène Bourgeois; Zoe Schnepp, Green Chemistry, 2014

This paper reports the direct transformation of raw lignocellulosic biomass into nanostructured graphitic carbon in a single step. Catalytic iron carbide nanoparticles are generated in situ by thermal decomposition of absorbed iron nitrate followed by carbothermal reduction. The Fe3C particles ...

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Radical Reactions of Borohydrides

14-10-2014 | Takuji Kawamoto; Ilhyong Ryu, Organic & Biomolecular Chemistry, 2014

Borohydrides are an important class of reagents in both organic and inorganic chemistry. Though popular as hydride-transfer reagents for reduction, since earlier work from the 1970s, borohydride reagents have also been known to serve as hydrogen-transfer reagents. In pursuit of greener tin ...

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Hetero-Nanostructured Suspended Photocatalysts for Solar-to-Fuel Conversion

14-10-2014 | Yu-peng Yuan; Lin-Wei Ruan; Jim Barber; Joachim Loo; Can Xue, Energy & Environmental Science, 2014

Converting solar energy into valuable hydrogen and hydrocarbon fuels through photocatalytic water splitting and CO2 photo-reduction is highly promising in addressing the growing demand for renewable and clean energy resources. Developing efficient photocatalysts for solar-driven H2 production and ...

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The KCaSrTa5O15 photocatalyst with tungsten bronze structure for water splitting and CO2 reduction

14-10-2014 | Tomoaki Takayama; Kentaro Tanabe; Kenji Saito; Akihide Iwase; Akihiko Kudo, Physical Chemistry Chemical Physics, 2014

KCaSrTa5O15 with tungsten bronze structure and a band gap of 4.1 eV showed activity for water splitting without cocatalysts. The activity was improved by loading the NiO cocatalyst. The apparent quantum yield of optimized NiO-loaded KCaSrTa5O15 was 2.3% at 254 nm for water splitting. When CO2 gas ...

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