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Artículos de revistas sobre el tema "Gold/Gallium/Calcium catalysts"

Autor: Grafiati

Publicado: 25 de enero de 2025

Última modificación: 31 de julio de 2025

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1

Kovalskaya, T. N., D. A. Varlamov, A. R. Kotelnikov, N. V. Chukanov, and G. M. Kalinin. "Hydrothermal synthesis of gallium epidote—analogue phases Ca2Al2Ga (Si3O12) (OH) from Tykotlova gold-sulfide occurence." Геохимия 64, no. 10 (2019): 1079–90. http://dx.doi.org/10.31857/s0016-752564101079-1090.

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In order to reconstruct the crystallization conditions of the gallium epidote analogue Ca2Al2Ga(Si3O12)(OH) from the Tykotlova gold-sulphide ore occurrence in the Polar Urals, for the first time, a series of epidote-gallium epidote solid solutions were synthesized. The parameters of the unit cell were calculated for these phases, and IR and Raman spectra were obtained. It was concluded that gallium is predominantly in position M3, which allows us to consider the gallium epidote as an independent mineral specie. Stable Ga-containing aluminosilicate and silicate phases in the Ca-Ga-Al-Fe-Si-O sy

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2

REDDY, E. LINGA, A. PRABHAKARN, J. KARUPPIAH, N. RAMESHBABU, and CH SUBRAHMANYAM. "GOLD SUPPORTED CALCIUM DEFICIENT HYDROXYAPATITE FOR ROOM TEMPERATURE CO OXIDATION." International Journal of Nanoscience 11, no. 03 (2012): 1240004. http://dx.doi.org/10.1142/s0219581x12400042.

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Gold supported hydroxyapatite (HA) and calcium deficient hydroxyapatite (CDHA) was studied for the room temperature CO oxidation. Nanostructured gold catalyst has been prepared by deposition precipitation method, whereas HA was synthesized by microwave synthesis. Inorder to understand the influence of surface properties of HA, support HA was synthesized with different Ca/P ratios (1.67, 1.62, 1.57, 1.534 and 1.5). The gold supported catalysts were characterized by XRD, BET, ICP-OES and TEM. Typical results indicate that gold supported 1.57 HA shows higher activity compared to other HA catalyst

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3

Wisniewska, Joanna, Izabela Sobczak, and Maria Ziolek. "The effect of the calcium dopant on the activity and selectivity of gold catalysts supported on SBA-15 and Nb-containing SBA-15 in methanol oxidation." Catalysis Science & Technology 11, no. 6 (2021): 2242–60. http://dx.doi.org/10.1039/d0cy02135k.

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Gold catalysts based on SBA-15, NbSBA-15 (Nb introduced in one pot synthesis) and Nb<sub>2</sub>O<sub>5</sub>/SBA-15 (prepared by impregnation of SBA-15) were doped with calcium species introduced before Au loading and were tested in gas-phase methanol oxidation.

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4

Ndlela, Siyabonga S., Holger B. Friedrich, and Mduduzi N. Cele. "Effects of Modifying Acidity and Reducibility on the Activity of NaY Zeolite in the Oxidative Dehydrogenation of n-Octane." Catalysts 10, no. 4 (2020): 363. http://dx.doi.org/10.3390/catal10040363.

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Non-coking stable alkaline earth metal (M = Mg, Sr, and Ba) modified Ga-NaY catalysts were prepared by ionic-exchange and tested in oxidative dehydrogenation (ODH) of n-octane using air as the source of oxygen. The role of the alkaline earth metals in NaY was to poison the acid sites while enhancing the basic sites responsible for ODH. The exception was the calcium modified NaY, which was more acidic than the parent NaY, coking and unstable under the ODH conditions used in this study. The role of gallium was to enhance the dehydrogenation pathway and improve the stability of NaY. The sequence

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5

Vecchietti, Julia, Sebastián Collins, Juan José Delgado, et al. "Gold Catalysts Supported on Cerium–Gallium Mixed Oxide for the Carbon Monoxide Oxidation and Water Gas Shift Reaction." Topics in Catalysis 54, no. 1-4 (2011): 201–9. http://dx.doi.org/10.1007/s11244-011-9653-6.

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6

Oliveira, Adriana S., Jennifer Cueto, María del Mar Alonso-Doncel, et al. "Propane dehydrogenation over Pt and Ga-containing MFI zeolites with modified acidity and textural properties." Catalysis Today 427 (October 24, 2023): 114437. https://doi.org/10.5281/zenodo.13837291.

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A variety of oxides (titanium, tin, calcium, magnesium, and gallium) were supported over nano-crystalline ZSM-5zeolite (n-ZSM-5) by wet impregnation, characterized and evaluated for propane dehydrogenation (PDH) reaction.To enhance the catalytic performance of the oxide-modified n-ZSM-5, Pt nanoparticles were also dispersedover the oxides-supported zeolite catalysts by wet impregnation. Finally, Ga-containing MFI zeolites were used ascatalysts in the PDH. Ga was incorporated into the zeolite by two different methods, via hydrothermal synthesisand via wet impregnation. In the PDH reaction, Pt-c

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7

Dumbre, Deepa K., Vasant R. Choudhary, Nilesh S. Patil, Balu S. Uphade, and Suresh K. Bhargava. "Calcium oxide supported gold nanoparticles as catalysts for the selective epoxidation of styrene by t-butyl hydroperoxide." Journal of Colloid and Interface Science 415 (February 2014): 111–16. http://dx.doi.org/10.1016/j.jcis.2013.10.016.

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8

Sigel, Helmut, and Astrid Sigel. "The bio-relevant metals of the periodic table of the elements." Zeitschrift für Naturforschung B 74, no. 6 (2019): 461–71. http://dx.doi.org/10.1515/znb-2019-0056.

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AbstractThe bio-relevant metals (and derived compounds) of the Periodic Table of the Elements (PTE) are in the focus. The bulk elements sodium (Na), potassium (K), magnesium (Mg), and calcium (Ca) from the s-block, which are essential for all kingdoms of life, and some of their bio-activities are discussed. The trace elements of the d-block of the PTE as far as they are essential for humans (Mn, Fe, Co, Cu, Zn, Mo) are emphasized, but V, Ni, Cd, and W, which are essential only for some forms of life, are also considered. Chromium is no longer classified as being essential. From the p-block met

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9

Faverge, Theo, Antoine Bonnefont, Marian Chatenet, and Christophe Coutanceau. "Electrocatalytic Conversion of Glucose into Hydrogen and Value-Added Compounds on Gold and Nickel Catalysts." ECS Meeting Abstracts MA2023-02, no. 27 (2023): 1421. http://dx.doi.org/10.1149/ma2023-02271421mtgabs.

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Fine chemistry historically relies on the fossil fuel industry, implying oil extraction and refining [1]. The rarefaction of this resource and adverse environmental consequences of its extraction motivate research for alternative sources of chemicals. Low carbon footprint chemicals can be synthesized from nonedible biomass waste [2]; cellulose extracted from biomass can therefore play an important role, being a clean and widely accessible carbon source. One can extract D-Glucose (units that constitute cellulose) from cellulose and obtain numerous chemicals of interest, such as sorbitol [3][4]

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10

Mishra, Shashank, Erwann Jeanneau, Stéphane Daniele, and Violaine Mendez. "Aminoalkoxo-supported heteroleptic hexanuclear gallium(iii) wheel as a synthon for group 13 heterometallics: A rare sol–gel precursor for mixed Al–Ga oxide as support for gold catalysts." Dalton Transactions 39, no. 32 (2010): 7440. http://dx.doi.org/10.1039/c0dt00485e.

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11

Ashaolu, V. O. "PROXIMATE ANALYSIS AND HEALTH RISK ASSESSMENT OF HEAVY METAL POLLUTANT OF WATER AND SEDIMENTS IN OSUN RIVER." Open Journal of Environmental Research (ISSN: 2734-2085) 1, no. 2 (2020): 01–08. http://dx.doi.org/10.52417/ojer.v1i2.146.

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There are thirty-five (35) metals with public health implications due to occupational or residential exposure; twenty-three (23) of these are called heavy elements or metals. They are Antimony, Arsenic, Bismuth, Cadmium, Cerium, Chromium, Cobalt, Copper, Gallium, Gold, Iron, Lead, Manganese, Mercury, Nickel, Platinum, Silver, Tellurium, Thallium, Tin, Uranium, Vanadium, and Zinc. Interestingly, minute amount of these elements are common in our environment and diet and are actually necessary for a balanced health, but increased consumption may cause acute or chronic toxicity (poisoning). Allerg

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12

Oliveira, Adriana S., Jennifer Cueto, María del Mar Alonso-Doncel, et al. "Propane dehydrogenation over Pt and Ga-containing MFI zeolites with modified acidity and textural properties." Catalysis Today 427 (February 1, 2024). https://doi.org/10.1016/j.cattod.2023.114437.

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A variety of oxides (titanium, tin, calcium, magnesium, and gallium) were supported over nano-crystalline ZSM-5 zeolite (n-ZSM-5) by wet impregnation, characterized and evaluated for propane dehydrogenation (PDH) reaction.To enhance the catalytic performance of the oxide-modified n-ZSM-5, Pt nanoparticles were also dispersed over the oxides-supported zeolite catalysts by wet impregnation. Finally, Ga-containing MFI zeolites were used as catalysts in the PDH. Ga was incorporated into the zeolite by two different methods, via hydrothermal synthesis and via wet impregnation. In the

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13

Bae, Seung Yong, Hee Won Seo, and Jeunghee Park. "Control of Morphology and Growth Direction of Gallium Nitride Nanostructures." MRS Proceedings 789 (2003). http://dx.doi.org/10.1557/proc-789-n11.30.

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ABSTRACTVarious shaped single-crystalline gallium nitride (GaN) nanostructures were produced by chemical vapor deposition method in the temperature range of 900–1200 °C. Scanning electron microscopy, transmission electron microscopy, electron diffraction, x-ray diffraction, electron energy loss spectroscopy, Raman spectroscopy, and photoluminescence were used to investigate the structural and optical properties of the GaN nanostructures. We controlled the GaN nanostructures by the catalyst and temperature. The cylindrical and triangular shaped nanowires were synthesized using iron and gold nan

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14

Dong, Wan Jae, Jan Paul Menzel, Zhengwei Ye, et al. "Synergistic Metal‐Support Interactions in Au/GaN Catalysts for Photoelectrochemical Nitrate Reduction to Ammonia." Small, February 16, 2025. https://doi.org/10.1002/smll.202412089.

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AbstractMetal‐support interactions are crucial in the electrochemical synthesis of ammonia (NH3) from nitrate (NO3−) reduction reaction, enabling efficient NH3 production under mild conditions. However, the complexity of the reaction pathways often limits efficiency. Here, a photoelectrochemical system composed of gold (Au) nanoclusters supported on gallium nitride (GaN) nanowires is introduced, grown on a n+‐p Si wafer, for selective reduction of NO3− to NH3 under solar illumination. NO3− ions are preferentially adsorbed and reduced to nitrite (NO2−) on the GaN nanowires, which then transfer

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15

Saini, Gunjan, Mrugesh Krishna Parasa, Katherine N. Clayton, et al. "Immobilization of azide-functionalized proteins to micro- and nanoparticles directly from cell lysate." Microchimica Acta 191, no. 1 (2023). http://dx.doi.org/10.1007/s00604-023-06068-4.

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AbstractImmobilization of proteins and enzymes on solid supports has been utilized in a variety of applications, from improved protein stability on supported catalysts in industrial processes to fabrication of biosensors, biochips, and microdevices. A critical requirement for these applications is facile yet stable covalent conjugation between the immobilized and fully active protein and the solid support to produce stable, highly bio-active conjugates. Here, we report functionalization of solid surfaces (gold nanoparticles and magnetic beads) with bio-active proteins using site-specific and b

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16

Porter, Lon A., Hee Cheul Choi, Alexander E. Ribbe, and Jillian M. Buriak. "Electroless Deposition and Patterning of Morphologically Complex Precious Metal Films on Semiconductor Surfaces." MRS Proceedings 737 (2002). http://dx.doi.org/10.1557/proc-737-f4.7.

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ABSTRACTPrecious metals are choice materials for a myriad of applications due their high electrical conductivity, resistance to corrosion, and ligand binding specificity. Indispensable in modern electronics fabrication, precious metals also enjoy widespread use as catalysts, support substrates, and sensor elements. Recent progress towards metallization on diminishing size regimes has imposed increasingly stringent demands upon thin film preparation methodologies. Metallization techniques employed in ultra large scale integration (ULSI) device fabrication, nanoelectromechanical systems (NEMS),

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17

Ashaolu, V. O. "PROXIMATE ANALYSIS AND HEALTH RISK ASSESSMENT OF HEAVY METAL POLLUTANT OF WATER AND SEDIMENTS IN OSUN RIVER." Open Journals of Environmental Research (OJER) ISSN: 2734-2085, April 7, 2021. https://doi.org/10.5281/zenodo.4668025.

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There are thirty-five (35) metals with public health implications due to occupational or residential exposure; twenty-three (23) of these are called heavy elements or metals. They are Antimony, Arsenic, Bismuth, Cadmium, Cerium, Chromium, Cobalt, Copper, Gallium, Gold, Iron, Lead, Manganese, Mercury, Nickel, Platinum, Silver, Tellurium, Thallium, Tin, Uranium, Vanadium, and Zinc. Interestingly, minute amount of these elements are common in our environment and diet and are actually necessary for a balanced health, but increased consumption may cause acute or chronic toxicity (poisoning). Allerg

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18

Ashaolu, V. O. "ASSESSMENT OF HEAVY METALS IN OKRA (Abelmoschus esculentus) CULTIVATED THROUGH IRRIGATION, IN MAIDUGURI, NIGERIA." Open Journals of Environmental Research (OJER) ISSN: 2734-2085, May 27, 2021. https://doi.org/10.5281/zenodo.4818105.

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There are thirty-five (35) metals with public health implications due to occupational or residential exposure; twenty-three (23) of these are called heavy elements or metals. They are Antimony, Arsenic, Bismuth, Cadmium, Cerium, Chromium, Cobalt, Copper, Gallium, Gold, Iron, Lead, Manganese, Mercury, Nickel, Platinum, Silver, Tellurium, Thallium, Tin, Uranium, Vanadium, and Zinc. Interestingly, minute amount of these elements are common in our environment and diet and are actually necessary for a balanced health, but increased consumption may cause acute or chronic toxicity (poisoning). Allerg

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19

Ashaolu, V. O. "PROXIMATE ANALYSIS AND HEALTH RISK ASSESSMENT OF HEAVY METAL POLLUTANT OF WATER AND SEDIMENTS IN OSUN RIVER." Open Journals of Environmental Research (OJER) ISSN: 2734-2085, May 27, 2021. https://doi.org/10.5281/zenodo.4818160.

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There are thirty-five (35) metals with public health implications due to occupational or residential exposure; twenty-three (23) of these are called heavy elements or metals. They are Antimony, Arsenic, Bismuth, Cadmium, Cerium, Chromium, Cobalt, Copper, Gallium, Gold, Iron, Lead, Manganese, Mercury, Nickel, Platinum, Silver, Tellurium, Thallium, Tin, Uranium, Vanadium, and Zinc. Interestingly, minute amount of these elements are common in our environment and diet and are actually necessary for a balanced health, but increased consumption may cause acute or chronic toxicity (poisoning). Allerg

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20

Pantulap, Usanee, Marcela Arango-Ospina, and Aldo R. Boccaccini. "Bioactive glasses incorporating less-common ions to improve biological and physical properties." Journal of Materials Science: Materials in Medicine 33, no. 1 (2021). http://dx.doi.org/10.1007/s10856-021-06626-3.

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AbstractBioactive glasses (BGs) have been a focus of research for over five decades for several biomedical applications. Although their use in bone substitution and bone tissue regeneration has gained important attention, recent developments have also seen the expansion of BG applications to the field of soft tissue engineering. Hard and soft tissue repair therapies can benefit from the biological activity of metallic ions released from BGs. These metallic ions are incorporated in the BG network not only for their biological therapeutic effects but also in many cases for influencing the struct

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21

RC, Jagessar. "Nanotechnology: “Advancing Material Science and Medicine”." Journal of Nanosciences Research & Reports, April 30, 2024, 1–4. http://dx.doi.org/10.47363/jnsrr/2024(6)160.

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Nanotechnology has been a rapidly growing field of advanced science at the inception of this century. Nanotechnology of advanced materials, polymers, principally revolves around endeavours to plan materials at a sub-atomic level to accomplish alluring properties and applications at a naturally visible level. Nanotechnology can be used for the advancement of technologies, ranging from communication and information, health and medicine, future energy, environment and climate change to transport and cultural heritage, personal protective equipment (PPE), fuels, fuel cells, biosensors, disease sen

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