141 research outputs found
Light-Promoted Hydrogenation of Carbon Dioxide¿An Overview
[EN] Hydrogenation of carbon dioxide is considered as a viable strategy to generate fuels while closing the carbon cycle (heavily disrupted by the abuse in the exploitation of fossil resources) and reducing greenhouse gas emissions. The process can be performed by heat-powered catalytic processes, albeit conversion and selectivity tend to be reduced at increasing temperatures owing to thermodynamic constraints. Recent investigations, as summarised in this overview, have proven that light activation is a distinct possibility for the promotion of CO2 hydrogenation to fuels. This effect is particularly beneficial in methanation processes, which can be enhanced under simulated solar irradiation using materials based on metallic nanoparticles as catalysts. The use of nickel, ruthenium and rhodium has led to substantial efficiencies. Light-promoted processes entail performances on a par with (or even superior to) those of thermally-induced, industrially-relevant, commercial technologies.The author thanks the Spanish Government (Ministerio de Economía y Competitividad, MINECO) for financial support via a project for young researchers (CTQ2015-74138-JIN), and the ‘‘Severo Ochoa’’ programme (SEV 2012-0267). The European Union is also acknowledged for the SynCatMatch project (ERCAdG-2014-671093)Puga Vaca, A. (2016). Light-Promoted Hydrogenation of Carbon Dioxide¿An Overview. Topics in Catalysis. 59(15-16):1268-1278. https://doi.org/10.1007/s11244-016-0658-zS126812785915-16Centi G, Perathoner S (2009) Opportunities and prospects in the chemical recycling of carbon dioxide to fuels. Catal Today 148:191–205Aresta M, Dibenedetto A, Angelini A (2014) Catalysis for the valorization of exhaust carbon: from CO2 to chemicals, materials, and fuels. technological use of CO2. Chem Rev 114:1709–1742Centi G, Quadrelli EA, Perathoner S (2013) Catalysis for CO2 conversion: a key technology for rapid introduction of renewable energy in the value chain of chemical industries. Energy Environ Sci 6:1711–1731Wang W, Wang S, Ma X, Gong J (2011) Recent advances in catalytic hydrogenation of carbon dioxide. Chem Soc Rev 40:3703–3727Gao J, Liu Q, Gu F, Liu B, Zhong Z, Su F (2015) Recent advances in methanation catalysts for the production of synthetic natural gas. RSC Adv 5:22759–22776Armaroli N, Balzani V (2011) The hydrogen issue. ChemSusChem 4:21–36Gao J, Wang Y, Ping Y, Hu D, Xu G, Gu F, Su F (2012) A thermodynamic analysis of methanation reactions of carbon oxides for the production of synthetic natural gas. RSC Adv 2:2358–2368Jadhav SG, Vaidya PD, Bhanage BM, Joshi JB (2014) Catalytic carbon dioxide hydrogenation to methanol: a review of recent studies. Chem Eng Res Des 92:2557–2567de Richter RK, Ming T, Caillol S (2013) Fighting global warming by photocatalytic reduction of CO2 using giant photocatalytic reactors. Renew Sust Energ Rev 19:82–106Schach M-O, Schneider R, Schramm H, Repke J-U (2010) Techno-economic analysis of postcombustion processes for the capture of carbon dioxide from power plant flue gas. Ind Eng Chem Res 49:2363–2370Centi G, Perathoner S (2010) Towards solar fuels from water and CO2. ChemSusChem 3:195–208Corma A, Garcia H (2013) Photocatalytic reduction of CO2 for fuel production: possibilities and challenges. J Catal 308:168–175Izumi Y (2013) Recent advances in the photocatalytic conversion of carbon dioxide to fuels with water and/or hydrogen using solar energy and beyond. Coord Chem Rev 257:171–186Dhakshinamoorthy A, Navalon S, Corma A, Garcia H (2012) Photocatalytic CO2 reduction by TiO2 and related titanium containing solids. Energy Environ Sci 5:9217–9233Indrakanti VP, Kubicki JD, Schobert HH (2009) Photoinduced activation of CO2 on Ti-based heterogeneous catalysts: current state, chemical physics-based insights and outlook. Energy Environ Sci 2:745–758Ozin GA (2015) You can’t have an energy revolution without transforming advances in materials, chemistry and catalysis into policy change and action. Energy Environ Sci 8:1682–1684Ozin GA (2015) Throwing new light on the reduction of CO2. Adv Mater 27:1957–1963Abe T, Tanizawa M, Watanabe K, Taguchi A (2009) CO2 methanation property of Ru nanoparticle-loaded TiO2 prepared by a polygonal barrel-sputtering method. Energy Environ Sci 2:315–321Li Y, Lu G, Ma J (2014) Highly active and stable nano NiO-MgO catalyst encapsulated by silica with a core-shell structure for CO2 methanation. RSC Adv 4:17420–17428Garbarino G, Bellotti D, Riani P, Magistri L, Busca G (2015) Methanation of carbon dioxide on Ru/Al2O3 and Ni/Al2O3 catalysts at atmospheric pressure: catalysts activation, behaviour and stability. Int J Hydrogen Energy 40:9171–9182Carenco S, Wu C-H, Shavorskiy A, Alayoglu S, Somorjai GA, Bluhm H, Salmeron M (2015) Synthesis and structural evolution of nickel-cobalt nanoparticles under H2 and CO2. Small 11:3045–3053Sharafutdinov I, Elkjaer CF, de Carvalho HWP, Gardini D, Chiarello GL, Damsgaard CD, Wagner JB, Grunwaldt J-D, Dahl S, Chorkendorff I (2014) Intermetallic compounds of Ni and Ga as catalysts for the synthesis of methanol. J Catal 320:77–88Studt F, Sharafutdinov I, Abild-Pedersen F, Elkjaer CF, Hummelshøj JS, Dahl S, Chorkendorff I, Nørskov JK (2014) Discovery of a Ni-Ga catalyst for carbon dioxide reduction to methanol. Nat Chem 6:320–324Garbarino G, Riani P, Magistri L, Busca G (2014) A study of the methanation of carbon dioxide on Ni/Al2O3 catalysts at atmospheric pressure. Int J Hydrogen Energy 39:11557–11565Iablokov V, Beaumont SK, Alayoglu S, Pushkarev VV, Specht C, Gao J, Alivisatos AP, Kruse N, Somorjai GA (2012) Size-controlled model CO nanoparticle catalysts for CO2 hydrogenation: synthesis, characterization, and catalytic reactions. Nano Lett 12:3091–3096Behrens M, Studt F, Kasatkin I, Kühl S, Hävecker M, Abild-Pedersen F, Zander S, Girgsdies F, Kurr P, Kniep B-L, Tovar M, Fischer RW, Nørskov JK, Schlögl R (2012) The active site of methanol synthesis over Cu/ZnO/Al2O3 industrial catalysts. Science 336:893–897Graciani J, Mudiyanselage K, Xu F, Baber AE, Evans J, Senanayake SD, Stacchiola DJ, Liu P, Hrbek J, Fernández Sanz J, Rodriguez JA (2014) Highly active copper-ceria and copper-ceria-titania catalysts for methanol synthesis from CO2. Science 345:546–550Fiordaliso EM, Sharafutdinov I, Carvalho HWP, Grunwaldt J-D, Hansen TW, Chorkendorff I, Wagner JB, Damsgaard CD (2015) Intermetallic GaPd2 nanoparticles on SiO2 for low-pressure CO2 hydrogenation to methanol: catalytic performance and in situ characterization. ACS Catal 5:5827–5836Kohno Y, Tanaka T, Funabiki T, Yoshida S (1997) Photoreduction of carbon dioxide with hydrogen over ZrO2. Chem Commun 9:841–842Kohno Y, Tanaka T, Funabiki T, Yoshida S (2000) Photoreduction of CO2 with H2 over ZrO2. A study of interaction of hydrogen with photoexcited CO2. Phys Chem Chem Phys 2:2635–2639Kohno Y, Ishikawa H, Tanaka T, Funabiki T, Yoshida S (2001) Photoreduction of carbon dioxide by hydrogen over magnesium oxide. Phys Chem Chem Phys 3:1108–1113Teramura K, Tsuneoka H, Shishido T, Tanaka T (2008) Effect of H2 gas as a reductant on photoreduction of CO2 over a Ga2O3 photocatalyst. Chem Phys Lett 467:191–194Tsuneoka H, Teramura K, Shishido T, Tanaka T (2010) Adsorbed Species of CO2 and H2 on Ga2O3 for the Photocatalytic Reduction of CO2. J Phys Chem C 114:8892–8898Teramura K, S-i Okuoka, Tsuneoka H, Shishido T, Tanaka T (2010) Photocatalytic reduction of CO2 using H2 as reductant over ATaO3 photocatalysts (A = Li, Na, K). Appl Catal B 96:565–568Kohno Y, Hayashi H, Takenaka S, Tanaka T, Funabiki T, Yoshida S (1999) Photo-enhanced reduction of carbon dioxide with hydrogen over Rh/TiO2. J Photochem Photobiol A 126:117–123Lo C-C, Hung C-H, Yuan C-S, Wu J-F (2007) Photoreduction of carbon dioxide with H2 and H2O over TiO2 and ZrO2 in a circulated photocatalytic reactor. Sol Energy Mater Sol Cells 91:1765–1774Hoch LB, Wood TE, O’Brien PG, Liao K, Reyes LM, Mims CA, Ozin GA (2014) The rational design of a single-component photocatalyst for gas-phase CO2 reduction using both UV and visible light. Adv Sci 1:1400013Li M, Li P, Chang K, Wang T, Liu L, Kang Q, Ouyang S, Ye J (2015) Highly efficient and stable photocatalytic reduction of CO2 to CH4 over Ru loaded NaTaO3. Chem Commun 51:7645–7648Tahir M, Amin NS (2015) Photocatalytic CO2 reduction with H2 as reductant over copper and indium co-doped TiO2 nanocatalysts in a monolith photoreactor. Appl Catal A 493:90–102Tahir M, Amin NS (2016) Performance analysis of nanostructured NiO–In2O3/TiO2 catalyst for CO2 photoreduction with H2 in a monolith photoreactor. Chem Eng J 285:635–649Ahmed N, Shibata Y, Taniguchi T, Izumi Y (2011) Photocatalytic conversion of carbon dioxide into methanol using zinc-copper-M(III) (M = aluminum, gallium) layered double hydroxides. J Catal 279:123–135Ahmed N, Morikawa M, Izumi Y (2012) Photocatalytic conversion of carbon dioxide into methanol using optimized layered double hydroxide catalysts. Catal Today 185:263–269Yang C-C, Vernimmen J, Meynen V, Cool P, Mul G (2011) Mechanistic study of hydrocarbon formation in photocatalytic CO2 reduction over Ti-SBA-15. J Catal 284:1–8Thampi KR, Kiwi J, Grätzel M (1987) Methanation and photo-methanation of carbon-dioxide at room-temperature and atmospheric pressure. Nature 327:506–508O’Brien PG, Sandhel A, Wood TE, Jelle AA, Hoch LB, Perovic DD, Mims CA, Ozin GA (2014) Photomethanation of gaseous CO2 over RU/silicon nanowire catalysts with visible and near-infrared photons. Adv Sci 1:1400001Meng X, Wang T, Liu L, Ouyang S, Li P, Hu H, Kako T, Iwai H, Tanaka A, Ye J (2014) Photothermal conversion of CO2 into CH4 with H2 over group VIII nanocatalysts: an alternative approach for solar fuel production. Angew Chem Int Ed 53:11478–11482Sastre F, Puga AV, Liu L, Corma A, García H (2014) Complete photocatalytic reduction of CO2 to methane by H2 under solar light irradiation. J Am Chem Soc 136:6798–6801Hong J, Zhang W, Ren J, Xu R (2013) Photocatalytic reduction of CO2: a brief review on product analysis and systematic methods. Anal Methods 5:1086–1097Yang C-C, Yu Y-H, van der Linden B, Wu JCS, Mul G (2010) Artificial photosynthesis over crystalline TiO2-based catalysts: fact or fiction. J Am Chem Soc 132:8398–8406Kohno Y, Tanaka T, Funabiki T, Yoshida S (1998) Identification and reactivity of a surface intermediate in the photoreduction of CO2 with H2 over ZrO2. J Chem Soc Faraday Trans 94:1875–1880Teramura K, Tanaka T, Ishikawa H, Kohno Y, Funabiki T (2004) Photocatalytic reduction of CO2 to CO in the presence of H2 or CH4 as a reductant over MgO. J Phys Chem B 108:346–354Zhang H, Wang T, Wang J, Liu H, Dao TD, Li M, Liu G, Meng X, Chang K, Shi L, Nagao T, Ye J (2016) Surface-plasmon-enhanced photodriven CO2 reduction catalyzed by metal-organic-framework-derived iron nanoparticles encapsulated by ultrathin carbon layers. Adv Mater 28:3703–3710Morikawa M, Ahmed N, Yoshida Y, Izumi Y (2014) Photoconversion of carbon dioxide in zinc-copper-gallium layered double hydroxides: the kinetics to hydrogen carbonate and further to CO/methanol. Appl Catal B 144:561–569Sabatier P (1910) Making methane or mixtures of methane and hydrogen, US Pat. 956734Melsheimer J, Guo W, Ziegler D, Wesemann M, Schlögl R (1991) Methanation of carbon dioxide over Ru/Titania at room temperature: explorations for a photoassisted catalytic reaction. Catal Lett 11:157–168Lin X, Yang K, Si R, Chen X, Dai W, Fu X (2014) Photoassisted catalytic methanation of CO in H2-rich stream over Ru/TiO2. Appl Catal B 147:585–591Lin X, Lin L, Huang K, Chen X, Dai W, Fu X (2015) CO methanation promoted by UV irradiation over Ni/TiO2. Appl Catal B 168–169:416–422Sastre F, Oteri M, Corma A, García H (2013) Photocatalytic water gas shift using visible or simulated solar light for the efficient, room-temperature hydrogen generation. Energy Environ Sci 6:2211–2215Sastre F, Corma A, García H (2013) Visible-light photocatalytic conversion of carbon monoxide to methane by nickel(ii) oxide. Angew Chem Int Ed 52:12983–12987Zhao Y, Zhao B, Liu J, Chen G, Gao R, Yao S, Li M, Zhang Q, Gu L, Xie J, Wen X, Wu L-Z, Tung C-H, Ma D, Zhang T (2016) Oxide-modified nickel photocatalyst for the production of hydrocarbons in visible light. Angew. Chem. Int. Ed. 55:4215–4219Albero J, Garcia H, Corma A (2016) Temperature dependence of solar light assisted CO2 reduction on Ni based photocatalyst. Top Catal 59:787–79
Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model
We present results from a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMM-based searches of LIGO data by using an improved frequency domain matched filter, the J-statistic, and by analyzing data from Advanced LIGO's second observing run. In the frequency range searched, from 60 to 650 Hz, we find no evidence of gravitational radiation. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of h095%=3.47×10-25 when marginalizing over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is specifically designed to be robust in the presence of spin wandering. © 2019 American Physical Society
Search for gravitational waves from Scorpius X-1 in the second Advanced LIGO observing run with an improved hidden Markov model
We present results from a semicoherent search for continuous gravitational waves from the low-mass x-ray binary Scorpius X-1, using a hidden Markov model (HMM) to track spin wandering. This search improves on previous HMM-based searches of LIGO data by using an improved frequency domain matched filter, the J-statistic, and by analyzing data from Advanced LIGO’s second observing run. In the frequency range searched, from 60 to 650 Hz, we find no evidence of gravitational radiation. At 194.6 Hz, the most sensitive search frequency, we report an upper limit on gravitational wave strain (at 95% confidence) of h95%0=3.47×10−25 when marginalizing over source inclination angle. This is the most sensitive search for Scorpius X-1, to date, that is specifically designed to be robust in the presence of spin wandering
Gaining historical and international relations insights from social media: spatio-temporal real-world news analysis using Twitter
Evaluation of fractions and 5,7-dihydroxy-4',6-dimethoxy-flavone fromClerodendrum phlomidis Linn. F. against Helicoverpa armigera Hub.
Search for gravitational waves associated with gamma-ray bursts detected by Fermi and Swift during the LIGO–Virgo run O3b
We search for gravitational-wave signals associated with gamma-ray bursts (GRBs) detected by the Fermi and Swift satellites during the second half of the third observing run of Advanced LIGO and Advanced Virgo (2019 November 1 15:00 UTC–2020 March 27 17:00 UTC). We conduct two independent searches: a generic gravitational-wave transients search to analyze 86 GRBs and an analysis to target binary mergers with at least one neutron star as short GRB progenitors for 17 events. We find no significant evidence for gravitational-wave signals associated with any of these GRBs. A weighted binomial test of the combined results finds no evidence for subthreshold gravitational-wave signals associated with this GRB ensemble either. We use several source types and signal morphologies during the searches, resulting in lower bounds on the estimated distance to each GRB. Finally, we constrain the population of low-luminosity short GRBs using results from the first to the third observing runs of Advanced LIGO and Advanced Virgo. The resulting population is in accordance with the local binary neutron star merger rate
First Measurement of the Hubble Constant from a Dark Standard Siren using the Dark Energy Survey Galaxies and the LIGO/Virgo Binary-Black-hole Merger GW170814
We present a multi-messenger measurement of the Hubble constant H 0 using the binary–black-hole merger GW170814 as a standard siren, combined with a photometric redshift catalog from the Dark Energy Survey (DES). The luminosity distance is obtained from the gravitational wave signal detected by the Laser Interferometer Gravitational-Wave Observatory (LIGO)/Virgo Collaboration (LVC) on 2017 August 14, and the redshift information is provided by the DES Year 3 data. Black hole mergers such as GW170814 are expected to lack bright electromagnetic emission to uniquely identify their host galaxies and build an object-by-object Hubble diagram. However, they are suitable for a statistical measurement, provided that a galaxy catalog of adequate depth and redshift completion is available. Here we present the first Hubble parameter measurement using a black hole merger. Our analysis results in , which is consistent with both SN Ia and cosmic microwave background measurements of the Hubble constant. The quoted 68% credible region comprises 60% of the uniform prior range [20, 140] km s−1 Mpc−1, and it depends on the assumed prior range. If we take a broader prior of [10, 220] km s−1 Mpc−1, we find {H}_{0 {78}_{-24}^{+96}\,\mathrm{km}\,{{\rm{s}}}^{-1}\,{\mathrm{Mpc}}^{-1} (57% of the prior range). Although a weak constraint on the Hubble constant from a single event is expected using the dark siren method, a multifold increase in the LVC event rate is anticipated in the coming years and combinations of many sirens will lead to improved constraints on H 0
Evolution of the longitudinal and azimuthal structure of the near-side jet peak in Pb-Pb collisions at 1asNN = 2.76 TeV
In two-particle angular correlation measurements, jets give rise to a near-side peak, formed by particles associated to a higher-pT trigger particle. Measurements of these correlations as a function of pseudorapidity ( \u3b7) and azimuthal ( \u3c6) differences are used to extract the centrality and pT dependence of the shape of the near-side peak in the pT range 1 < pT < 8 GeV/c in Pb-Pb and pp collisions at 1asNN = 2.76 TeV. A combined fit of the near-side peak and long-range correlations is applied to the data and the peak shape is quantified by the variance of the distributions. While the width of the peak in the \u3c6 direction is almost independent of centrality, a significant broadening in the \u3b7 direction is found from peripheral to central collisions. This feature is prominent for the low-pT region and vanishes above 4 GeV/c. The widths measured in peripheral collisions are equal to those in pp collisions in the \u3c6 direction and above 3 GeV/c in the \u3b7 direction. Furthermore, for the 10% most central collisions and 1 < pT,assoc < 2 GeV/c, 1 < pT,trig < 3 GeV/c, a departure from a Gaussian shape is found: a depletion develops around the center of the peak. The results are compared to A Multi-Phase Transport (AMPT) model simulation as well as other theoretical calculations indicating that the broadening and the development of the depletion are connected to the strength of radial and longitudinal flow
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Not AvailablePresent study was undertaken to identify the incidence rate for five major pathogens viz., Staphylococcus aureus (S. aureus), Staphylococcus epidermidis (S. epidermidis), Streptococcus agalactiae (S. agalactiae), Streptococcus dysgalactiae (S. dysgalactiae) and Escherichia coli (E. coli) in the milk samples collected from Bangalore and Kolar district by PCR based microorganism detection technique. A total of 214 composite milk samples were screened by CMT and then PCR based detection of pathogens for the samples was carried out. Results revealed presence of S. aureus in 28.5 per cent of the total animals screened, S. epidermis was identified in 15.42 per cent cases. E. coli followed and the incidence rate was 13.55 per cent with regard to E. coli. S. agalactiae and S. dysgalactiae were identified in 10.28 per cent and 3.74 per cent of the cases respectively. None of the pathogens considered in this study were detected in 117 milk samples, these samples were also observed to be normal for CMT. Present study supported the fact that PCR based identification of mastitis causing pathogens from milk is a rapid and reliable method to reveal the exact bacterial etiology of mastitis.Not Availabl
Peri‐arterial pathways for clearance of α‐Synuclein and tau from the brain: Implications for the pathogenesis of dementias and for immunotherapy
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