Results 21 to 30 of about 614 (173)

Production and Characterization of Magnesium‐Doped Copper Chromite Fibers

physica status solidi (a), 2017
In this study, Mg‐doped CuCr1−xMgxO2 (x = 0, 0.01, 0.03, 0.05) fibers are synthesized via electrospinning process followed by a two‐step heat treatment in air and Ar atmospheres. The produced samples are all crystalline with a fiber diameter ranging from 120 to 140 nm.
Ismail C. Kaya, Hasan Akyildiz
openaire   +2 more sources

Comparative analyses of the infiltration of Al–Cr–O and Mg–Cr–O refractories by molten phases in the copper-making process using the sessile drop technique

Boletín de la Sociedad Española de Cerámica y Vidrio, 2020
The refractory used in the pyrometallurgical furnaces is periodically replaced because of wear. Refractory wear is determined by contact with the molten phases that interact with the refractory, in which chemical reactions are significant.
Ismael Pérez, Ignacio Moreno-Ventas, Roberto Parra, Eugenia Araneda, Guillermo Ríos   +4 more
doaj   +1 more source

Mineral Resources Potential of Vietnam and Current State of Mining Activity

Applied Environmental Research, 2014
Vietnam, with an area of 331,210 km2, occupies the eastern side of the Indochina peninsula. It forms a narrow (locally only 40-70 km) band of land, extending over 1,500 km along the East Sea (South China Sea). Vietnam is constituted mainly by the folded
Nguyen Ngoc Khoi
doaj   +7 more sources

Emerging Materials and Future Strategies for Solid Oxide Electrochemical Cells

Advanced Energy Materials, EarlyView.
Solid oxide electrochemical cells operate under strongly coupled electrochemical and thermodynamic conditions, where performance is constrained by interactions among crystal structure, defect chemistry, and interfacial evolution. This review, based on a structure‐defect‐property‐durability framework, reveals the roles of lattice symmetry and defect ...
Qiuchun Lu, Yufei Zhang, Han Zhao, Pooi See Lee, Daniel H.C. Chua   +4 more
wiley   +1 more source

Inverse Co-precipitation Synthesis of Copper Chromite Nanoparticles [PDF]

Iranian Journal of Chemistry & Chemical Engineering, 2016
In this study, copper chromite (CuCr2O4) nanoparticles was prepared by inverse co-precipitation method. In this method, cupric nitrate trihydrate, (Cu (NO3)2.3H2O) and chromium nitrate nonahydrate, (Cr (NO3) 3.9H2O) with a mole ratio of 1:2 were used ...
Hassan Tavakoli, Rasoul Sarraf Mamoory, Ali Reza Zarei   +2 more
doaj  

Role of Lewis centres on ethanol dehydrogenation over the Cu‐Cr/γ‐Al2O3 system

The Canadian Journal of Chemical Engineering, EarlyView.
Cu–Cr interactions on alumina enhance Lewis acid site density, boosting selectivity towards ethanol dehydrogenation products. Soft coke formation on copper and Cu–Cr sites drives deactivation, shifting the reaction towards unwanted dehydration products.
Sakun Preedavijitkul, Wei Tian, Andres Rodriguez‐Marmolejo, Pantita Trongjitraksa, Chaowat Autthanit, Piyasan Praserthdam, Bunjerd Jongsomjit, Jose E. Herrera   +7 more
wiley   +1 more source

Talc‐Tempered Pottery From Bala Hissar, Kabul: An Analytical Study

Archaeometry, EarlyView.
ABSTRACT Potsherds of cooking ware excavated at Bala Hissar archaeological site in Kabul were studied using X‐ray fluorescence (XRF), scanning electron microscope‐energy dispersive X‐ray spectrometry (SEM‐EDS), Raman spectroscopy, X‐ray powder diffraction (XRPD), thermogravimetric analysis (TGA) and optical microscopy.
Parviz Holakooei, Babak Rafiei‐Alavi, Hafizullah Hazim, Hasti Pezeshkanjalili, Lara Maritan   +4 more
wiley   +1 more source

SELECTIVE HYDROGENOLYSIS OF GLYCEROL TO PROPYLENE GLYCOL IN A CONTINUOUS FLOW TRICKLE BED REACTOR USING COPPER CHROMITE AND Cu/Al2O3 CATALYSTS

Química Nova
The glycerol hydrogenolysis reaction was performed in a continuous flow trickle bed reactor using a water glycerol feed and both copper chromite and Cu/Al2O3 catalysts.
Jorge Sepúlveda, Debora Manuale, Lucia Santiago, Nicolás Carrara, Gerardo Torres, Carlos Vera, Maraisa Goncalves, Wagner Carvalho, Dalmo Mandelli   +8 more
doaj   +1 more source

Post-mortem study of magnesia-chromite refractory used in the gas area of a Submerged Arc Furnace for the copper-making process

Boletín de la Sociedad Española de Cerámica y Vidrio, 2019
This work is a post-mortem study of the magnesia-chromite refractory lining of the gas area of a Submerged Arc Furnace (SAF) used for slag-cleaning at the Atlantic Copper Smelter (Spain) after a six-year working campaign.
Ismael Pérez, Ignacio Moreno-Ventas, Roberto Parra, Guillermo Ríos   +3 more
doaj   +1 more source

A Microkrystite from the Australasian Tektite/Microtektite Strewn Field

Meteoritics &Planetary Science, EarlyView.
Abstract Microkrystites are glassy impact spherules. They contain primary crystallites carrying information on the physical and chemical conditions prevailing during vaporization, melting, and ejection in large impact cratering events. We report on the geochemistry and mineralogy down to nanometer scale of the first microkrystite (ODP1144A,14) from the
Matteo Del Rio, Luigi Folco, Matteo Masotta, Ana Černok, Enrico Mugnaioli   +4 more
wiley   +1 more source