scholarly journals Influence of the metal/metal oxide redox cycle on the catalytic activity of methane oxidation over Pd and Ni doped hydroxyapatite

2018 ◽  
Vol 107 ◽  
pp. 82-86 ◽  
Author(s):  
Joanna Kamieniak ◽  
Peter J. Kelly ◽  
Aidan M. Doyle ◽  
Craig E. Banks
Keyword(s):  
Catalytic Activity ◽  
Metal Oxide ◽  
Methane Oxidation ◽  
Redox Cycle ◽  
Metal Metal

Highly-efficient and autocatalytic reduction of NaHCO3 into formate by in situ hydrogen from water splitting with metal/metal oxide redox cycle

2017 ◽  
Vol 26 (5) ◽  
pp. 881-890 ◽  
Author(s):  
Guodong Yao ◽  
Jia Duo ◽  
Binbin Jin ◽  
Heng Zhong ◽  
Lingyun Lyu ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Water Splitting ◽  
Redox Cycle ◽  
Highly Efficient ◽  
Metal Metal

Transition metal/metal oxide modified MCM-41 for pollutant degradation and hydrogen energy production: a review

RSC Advances ◽  
2015 ◽  
Vol 5 (102) ◽  
pp. 83707-83724 ◽  
Author(s):  
Dipti Prava Sahoo ◽  
Dharitri Rath ◽  
Binita Nanda ◽  
K. M. Parida
Keyword(s):  
Catalytic Activity ◽  
Metal Oxide ◽  
Energy Production ◽  
High Surface ◽  
High Surface Area ◽  
Hydrogen Energy ◽  
Pollutant Degradation ◽  
Metal Metal ◽  
Catalytic Applications ◽  
Mcm 41

Metal/metal oxide modified MCM-41 materials are suitable for various catalytic applications. The high surface area, mesoscopic pore size and tunable pore volume of the materials play a key role in enhancing the catalytic activity.

A rational design of a Pd-based catalyst with a metal–metal oxide interface influencing molecular oxygen in the aerobic oxidation of alcohols

2019 ◽  
Vol 21 (9) ◽  
pp. 2494-2503 ◽  
Author(s):  
Songhita Meher ◽  
Rohit Kumar Rana
Keyword(s):  
Catalytic Activity ◽  
Metal Oxide ◽  
Molecular Oxygen ◽  
Rational Design ◽  
Aerobic Oxidation ◽  
Oxide Interface ◽  
Metal Metal ◽  
Oxidation Of Alcohols

The Pd–PdO interface stabilized on the rGO surface is shown to be the key to achieve enhanced catalytic activity in oxidation of alcohols under O2 as the oxidant.

Tuning the CO oxidation catalytic activity of supported metal–metal oxide heterostructures by an aqueous phase post-treatment process

2016 ◽  
Vol 4 (46) ◽  
pp. 18075-18083 ◽  
Author(s):  
Chunzheng Wu ◽  
Rosaria Brescia ◽  
Mirko Prato ◽  
Sergio Marras ◽  
Liberato Manna ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Temperature ◽  
Metal Oxide ◽  
Co Oxidation ◽  
Treatment Process ◽  
Oxide Interface ◽  
Oxide Heterostructures ◽  
Metal Metal ◽  
Ligand Free ◽  
Post Treatment Process

Colloidal Au–MnO heterodimers were deposited on SiO2 and calcined at high temperature in air in order to prepare a ligand-free Au–Mn3O4/SiO2 model catalyst for CO oxidation with a well-defined Au size and Au–metal oxide interface.

scholarly journals Engineering catalyst supports to stabilize Pd/PdO 2D rafts for water-tolerant methane oxidation

2020 ◽  
Author(s):  
Haifeng Xiong ◽  
Deepak Kunwar ◽  
Carlos García-Vargas ◽  
Griffin Canning ◽  
Dong Jiang ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Methane Oxidation ◽  
Heterogeneous Catalysts ◽  
Catalyst Support ◽  
Nucleation And Growth ◽  
Catalyst Supports ◽  
Support Surface ◽  
Metal Oxide Clusters ◽  
Single Atoms ◽  
Metal Metal

Abstract The size and morphology of the active phase (metal or metal oxide) are critical for the performance of heterogeneous catalysts. Conventional approaches for catalyst synthesis involve the modification of pore size and structure, the use of ligands to anchor the metal during preparation or the use of nanostructured oxides with well-defined facets to provide suitable sites for metal nucleation and growth. However, these approaches may not yield durable catalysts for high temperature applications, such as the treatment of unburnt methane from natural gas fueled engines. Here we demonstrate an approach that relies on the trapping of metal single atoms on the support surface, in thermally stable form, to modify the nature of deposited metal/metal oxide clusters. By anchoring Pt ions on the catalyst support we can tailor the morphology of the deposited phase. In particular, two-dimensional (2-D) rafts of Pt/PtOx on the engineered catalyst support are formed by this approach, as opposed to three-dimensional (3-D) metal oxide nanoparticles on conventional supports. Adopting this approach for the synthesis of bimetallic catalysts via addition of Pd to the atom-trapped catalyst support (Pt@CeO2) we found that the resulting Pd/Pt@CeO2 catalyst provides improved thermal stability and water tolerance during methane oxidation. We attribute the improved performance to the 2-D morphology of the Pd/PdO phase present on the atom-trapped catalyst support. The results show that modifying the support by trapping single atoms could provide an important addition to the toolkit of catalyst designers to engineer catalyst supports for controlling the nucleation and growth of metal and metal oxide clusters in heterogeneous catalysts.

scholarly journals The application prospect of metal/metal oxide nanoparticles in the treatment of osteoarthritis

2021 ◽  
Vol 394 (10) ◽  
pp. 1991-2002
Author(s):  
Junchao Luo ◽  
Yin Zhang ◽  
Senbo Zhu ◽  
Yu Tong ◽  
Lichen Ji ◽  
...  
Keyword(s):  
Metal Oxide ◽  
Metal Oxide Nanoparticles ◽  
Biological Response ◽  
Cell Uptake ◽  
Oxide Nanoparticles ◽  
Therapeutic Effects ◽  
Superoxide Anions ◽  
Metal Metal ◽  
Cartilage Wear

AbstractThe current understanding of osteoarthritis is developing from a mechanical disease caused by cartilage wear to a complex biological response involving inflammation, oxidative stress and other aspects. Nanoparticles are widely used in drug delivery due to its good stability in vivo and cell uptake efficiency. In addition to the above advantages, metal/metal oxide NPs, such as cerium oxide and manganese dioxide, can also simulate the activity of antioxidant enzymes and catalyze the degradation of superoxide anions and hydrogen peroxide. Degrading of metal/metal oxide nanoparticles releases metal ions, which may slow down the progression of osteoarthritis by inhibiting inflammation, promoting cartilage repair and inhibiting cartilage ossification. In present review, we focused on recent research works concerning osteoarthritis treating with metal/metal oxide nanoparticles, and introduced some potential nanoparticles that may have therapeutic effects.

Reusability of metals/metal oxide coupled zinc oxide nanorods in degradation of rhodamine B dye

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Anh Thi Le ◽  
Swee-Yong Pung
Keyword(s):  
Metal Oxide ◽  
Metal Ions ◽  
Rhodamine B ◽  
Zno Nanorods ◽  
Zinc Oxide Nanorods ◽  
Uv Exposure ◽  
Precipitation Method ◽  
Subsequent Stage ◽  
Content Type ◽  
Metal Metal

Purpose This paper aims to investigate the reusability of metal/metal oxide-coupled ZnO nanorods (ZnO NRs) to degrade rhodamine B (RhB). Design/methodology/approach ZnO NRs particles were synthesized by precipitation method and used to remove various types of metal ions such as Cu2+, Ag+, Mn2+, Ni2+, Pb2+, Cd2+ and Cr2+ ions under UV illumination. The metal/metal oxide-coupled ZnO NRs were characterized by scanning electron microscope, X-ray diffraction and UV-Vis diffuse reflectance. The photodegradation of RhB dye by these metal/metal oxide-coupled ZnO NRs under UV exposure was assessed. Findings The metal/metal oxide-coupled ZnO NRs were successfully reused to remove RhB dye in which more than >90% of RhB dye was degraded under UV exposure. Furthermore, the coupling of Ag, CuO, MnO2, Cd and Ni particles onto the surface of ZnO NRs even enhanced the degradation of dye. The dominant reactive species involved in the degradation of RhB dye were •OH- and •O2−-free radicals. Research limitations/implications The coupling of metal/metal oxide onto the surface of ZnO NRs after metal ions removal could affect the photocatalytic performance of ZnO NRs in the degradation of organic pollutants in subsequent stage. Practical implications A good reusability performance of metal/metal oxide-coupled ZnO NRs make ZnO NRs become a desirable photocatalyst material for the treatment of wastewater, which consists of both heavy metal ions and organic dyes. Originality/value Metal/metal oxide coupling onto the surface of ZnO NRs particles improved subsequent UV-assisted photocatalytic degradation of RhB dye.

Surface to bulk charge transfer at an alkali metal/metal oxide interface

2003 ◽  
Vol 547 (1-2) ◽  
pp. L859-L864 ◽  
Author(s):  
R Lindsay ◽  
E Michelangeli ◽  
B.G Daniels ◽  
M Polcik ◽  
A Verdini ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Alkali Metal ◽  
Metal Oxide ◽  
Oxide Interface ◽  
Metal Metal ◽  
Bulk Charge

The Study on Solid Superacid Synthesis of K12A with Manufacturing Equipment

2012 ◽  
Vol 583 ◽  
pp. 285-288
Author(s):  
Dong Mei Zhao ◽  
Xue Peng Liu
Keyword(s):  
Catalytic Activity ◽  
Metal Oxide ◽  
Design Method ◽  
Orthogonal Design ◽  
Manufacturing Equipment ◽  
Solid Superacid ◽  
Orthogonal Design Method ◽  
Superacid Catalyst ◽  
Calcined Temperature ◽  
Very High

By orthogonal design method, Catalytic activity of /ZrO2 solid superacid is studied, and the influence of catalyst characteristic and structure by manufacturing equipment is issued. It is concluded that the best prepared conditions of the superacid catalyst /ZrO2 for the synthesis of Octyl-Polyglycoside are followed:(1) PH=9.5; (2) calcined temperature at 500; (3) M(H2SO4)=0.5mol/L. Using this kind of catalyst the conversion of glueoside may reach as high as 96% in the synthesis of OCtyl-Polyglycoside and the selectivity is very high for the synthesis of Octyl-Polyglycoside. By introducing other metal oxide, the catalytic activity of complex solid superacid is studied.

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