Controlling the O-Vacancy Formation and Performance of Au/ZnO Catalysts in CO2 Reduction to Methanol by the ZnO Particle Size

ACS Catalysis ◽  
2021 ◽  
pp. 9022-9033
Author(s):  
Shilong Chen ◽  
Ali M. Abdel-Mageed ◽  
Chihiro Mochizuki ◽  
Tamao Ishida ◽  
Toru Murayama ◽  
...  
Keyword(s):  
Particle Size ◽  
Co2 Reduction ◽  
Vacancy Formation ◽  
O Vacancy ◽  
And Performance

Influence of CO on the Activation, O-Vacancy Formation, and Performance of Au/ZnO Catalysts in CO2 Hydrogenation to Methanol

2019 ◽  
Vol 10 (13) ◽  
pp. 3645-3653 ◽  
Author(s):  
Ali M. Abdel-Mageed ◽  
Alexander Klyushin ◽  
Axel Knop-Gericke ◽  
Robert Schlögl ◽  
R. Jürgen Behm
Keyword(s):  
Co2 Hydrogenation ◽  
Vacancy Formation ◽  
O Vacancy ◽  
And Performance

scholarly journals Effects of Particle Size and Cement Replacement of LCD Glass Powder in Concrete

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Seong Kyum Kim ◽  
Su Tae Kang ◽  
Jin Kwang Kim ◽  
Il Young Jang
Keyword(s):  
Particle Size ◽  
Glass Powder ◽  
Liquid Crystal Display ◽  
Waste Recycling ◽  
Cement Industry ◽  
Hardened Concrete ◽  
National Scale ◽  
The Sustainable Development ◽  
Technological Level ◽  
And Performance

The high quality liquid crystal display (LCD) processing waste glass (LPWG) generated from the manufacturing process of Korea’s LCD industries, having the world’s highest technological level and production, was finely ground into particles smaller than cement particles (higher fineness than OPC) to verify their applicability and performance as a replacement for cement. For a concrete mix having a W/B ratio of 0.44, cement was replaced with LPWG glass powder (LGP) at ratios of 5, 10, 15, and 20% (LGP12) and 5 and 10% (LGP5) according to the particle size to prepare test cylinder specimens, which were tested with respect to air contents, slump in fresh concrete, and compressive strength and splitting tensile strength of hardened concrete. The microstructure of the concrete specimens was analyzed through Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX), and a Mercury Intrusion Porosimetry (MIP). Replacement of cement with LGP for cement could effectively decrease the quantity of cement used due to the excellent performance of LGP. It may positively contribute to the sustainable development of the cement industry as well as waste recycling and environment conservation on a national scale.

Preferential location of zirconium dopants in cerium dioxide nanoparticles and the effects of doping on their reducibility: a DFT study

2020 ◽  
Vol 22 (45) ◽  
pp. 26568-26582
Author(s):  
Iskra Z. Koleva ◽  
Hristiyan A. Aleksandrov ◽  
Konstantin M. Neyman ◽  
Georgi N. Vayssilov
Keyword(s):  
Cerium Dioxide ◽  
Dft Study ◽  
Vacancy Formation ◽  
Ceria Nanoparticles ◽  
Zirconium Doping ◽  
Mixed Nanoparticles ◽  
O Vacancy ◽  
Preferential Location

Zirconium doping dramatically facilitates O vacancy formation in ceria nanoparticles not only at the surface but also in four-coordinated inner O positions, which enhances O mobility. In mixed nanoparticles zirconium tends to occupy inner sites.

scholarly journals Solid-state synthesis of NASICON (Na3Zr2Si2PO12) using nanoparticle precursors for optimisation of ionic conductivity

2019 ◽  
Vol 55 (6) ◽  
pp. 2291-2302 ◽  
Author(s):  
A. Jalalian-Khakshour ◽  
C. O. Phillips ◽  
L. Jackson ◽  
T. O. Dunlop ◽  
S. Margadonna ◽  
...  
Keyword(s):  
Particle Size ◽  
Solid State ◽  
Ionic Conductivity ◽  
Raw Materials ◽  
Ionic Conductivities ◽  
Solid State Synthesis ◽  
Powder Particle Size ◽  
Macro Scale ◽  
And Performance ◽  
Microstructure And Performance

Abstract In this work, the effect of varying the size of the precursor raw materials SiO2 and ZrO2 in the solid-state synthesis of NASICON in the form Na3Zr2Si2PO12 was studied. Nanoscale and macro-scale precursor materials were selected for comparison purposes, and a range of sintering times were examined (10, 24 and 40 h) at a temperature of 1230 °C. Na3Zr2Si2PO12 pellets produced from nanopowder precursors were found to produce substantially higher ionic conductivities, with improved morphology and higher density than those produced from larger micron-scaled precursors. The nanoparticle precursors were shown to give a maximum ionic conductivity of 1.16 × 10−3 S cm−1 when sintered at 1230 °C for 40 h, in the higher range of published solid-state Na3Zr2Si2PO12 conductivities. The macro-precursors gave lower ionic conductivity of 0.62 × 10−3 S cm−1 under the same processing conditions. Most current authors do not quote or consider the precursor particle size for solid-state synthesis of Na3Zr2Si2PO12. This study shows the importance of precursor powder particle size in the microstructure and performance of Na3Zr2Si2PO12 during solid-state synthesis and offers a route to improved predictability and consistency of the manufacturing process.

Magnetic Properties of Some Hydrated Transition Metal Oxide and Hydroxide Nanoparticles Synthesized in Different Media

2010 ◽  
Vol 123-125 ◽  
pp. 727-730 ◽  
Author(s):  
Abdulaziz A. Bagabas ◽  
Khalil A. Ziq ◽  
Ahmad F. Salem ◽  
Emad S. Addurihem
Keyword(s):  
Particle Size ◽  
Transition Metal ◽  
Room Temperature ◽  
Permanent Magnets ◽  
Cost Effective ◽  
Precipitation Method ◽  
Energy Product ◽  
Wide Range ◽  
Precipitation Medium ◽  
And Performance

Nanoscale particle size of metal oxides and hydroxides showed enhanced various physical properties and performance. We established a simple, cost-effective, room-temperature (RT) precipitation method for the preparation of the magnetic, first-raw transition metal (TM) hydrated oxide and hydroxide nanoparticles. This method is based on the use of the TM nitrate, as the metal source, and cyclohexylamine (CHA), as a precipitating agent, either in the water (H2O) or ethanol (EtOH) medium. We found that the precipitation medium and the identity of precipitated TM strongly affect the morphology, particle size, and magnetism of the product. The morphology varies from spherical, to rectangular, to rod shape; while the size varies in the range of 5-30 nm. All samples showed paramagnetic behavior with Curie temperatures span over a wide range (20-150K). Huge hysteresis looses has been observed for manganese (Mn) sample, prepared in H2O. The coercively (Hc) at 4.2K for this sample is about 1.5T, which is comparable to the strongest permanent magnets (Nd-based magnets) available at room temperature. The energy product (Hc*MR) is about 4.5*105 (emu/g)Oe.

scholarly journals Feeding forages with reduced particle size in a total mixed ration improves feed intake, total-tract digestibility, and performance of organic dairy cows

2019 ◽  
Vol 102 (10) ◽  
pp. 8839-8849 ◽  
Author(s):  
Andreas Haselmann ◽  
Katharina Zehetgruber ◽  
Birgit Fuerst-Waltl ◽  
Werner Zollitsch ◽  
Wilhelm Knaus ◽  
...  
Keyword(s):  
Particle Size ◽  
Dairy Cows ◽  
Feed Intake ◽  
Total Mixed Ration ◽  
Organic Dairy ◽  
And Performance

Effect of the Adjuvants on the Properties of Superfine SnO2 Powders

2018 ◽  
Vol 281 ◽  
pp. 705-709
Author(s):  
Jie Guang Song ◽  
Lin Chen ◽  
Xian Jie Zhou ◽  
Xue Yang ◽  
Xin Peng Lou ◽  
...  
Keyword(s):  
Particle Size ◽  
Grain Size ◽  
Solar Cells ◽  
Reaction Time ◽  
Powder Material ◽  
Tin Oxide ◽  
Molar Ratio ◽  
New Type ◽  
And Performance ◽  
Holding Temperature

Ultrafine SnO2 is a new type of material, in the field of solar cells and semiconductors have a lot of use. To get different morphology and different properties of tin oxide powder material, making more applications in the field, the effect of the adjuvants on the properties of superfine SnO2 powders were distigated. Through the analysis of experimental results, the conclusions are shown the stronger the alkalinity of the auxiliary agent, the larger the grain size of the obtained particles and the more uniform the particles. When the molar ratio of salt to alkali is more than 1: 4, the amount of alkali is gradually reduced, the particle size is small, the morphology is not uniform and easy to agglomerate. When the molar ratio of salt to alkali is 1: 4, the smaller particle size is shown, the appearance morphology is uneven. The longer the reaction time, the more complete the grain, the more uniform the morphology. Under the condition of SnCl4 concentration of 0.05mol/L, reaction time is 4 days, salt and alkali molar ratio is 1: 4, holding temperature is 200°C, the auxiliary agent is NaOH, the size, shape and performance of synthesized SnO2 are the better.

Study on Dispersion and Performance of Yellow Lake

2011 ◽  
Vol 233-235 ◽  
pp. 1246-1251
Author(s):  
Xian Leng ◽  
Lu Hai Li ◽  
Xu Wei Hu ◽  
Hua Fang ◽  
Shu Kun Li ◽  
...  
Keyword(s):  
Particle Size ◽  
Disperse System ◽  
High Speed ◽  
Reflectance Spectroscopy ◽  
Deionized Water ◽  
Disperse Systems ◽  
Safe Level ◽  
Water Based ◽  
Color Density ◽  
And Performance

In order to study the dispersion and performance of tartrazine aluminum lake, 7 kinds of water-based resins are used to form disperse system. These systems are enviroment friendly (low VOC) and use edible yellow lake as colorant. If proper adjustment is added, these disperse systems can be made into ink and paint. The application field should be printing or coating on all the food or drug packages, toys and decorate materials, which will improve social safe level. Colorant, resin, wetting agent, co-solvent, emulsifier, and deionized water are mixed at certain ratio and pre-dispersed for 15min, then dispersed in GJ-2S high speed sanding mill for 3h. Size distribution, PDI, color characteristics (reflectance spectroscopy and color density), glossiness, abrasion performance, and stability are studied. Results demonstrate particle size of disperse system is 338.1~595.3nm (PDI<0.3) and changed to 428.6~551.2nm after 5 days or so. Reflectance spectroscopy is close to PANTONE standard yellow. Glossiness is referred as Gs(60°)≥32°. Viscosity is 0.2~2Pa·S. Relative stable disperse system is prepared.

Feed particle size: Implications on the digestion and performance of poultry

2007 ◽  
Vol 63 (3) ◽  
pp. 439-455 ◽  
Author(s):  
A.M. Amerah ◽  
V. Ravindran ◽  
R.G. Lentle ◽  
D.G. Thomas
Keyword(s):  
Particle Size ◽  
And Performance
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