Catalytic oxidation of methyl bromide using ruthenium-based catalysts

2016 ◽  
Vol 6 (12) ◽  
pp. 4337-4344 ◽  
Author(s):  
Xiaolong Liu ◽  
Junlin Zeng ◽  
Jian Wang ◽  
Wenbo Shi ◽  
Tingyu Zhu
Keyword(s):  
Thermal Stability ◽  
Catalytic Oxidation ◽  
Methyl Bromide ◽  
Catalytic Performance ◽  
Product Selectivity

Ruthenium-based catalysts Ru/TiO2, Ru/SiO2, Ru/γ-Al2O3, and Ru/ZrO2 were prepared and evaluated for CH3Br oxidation, and Ru/TiO2 showed the best catalytic performance. Product selectivity, thermal stability, and anti-moisture properties were also studied.

scholarly journals Electron donation of non-oxide supports boosts O2 activation on nano-platinum catalysts

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tao Gan ◽  
Jingxiu Yang ◽  
David Morris ◽  
Xuefeng Chu ◽  
Peng Zhang ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Pt Nanoparticles ◽  
Catalytic Performance ◽  
Nitrogen Vacancy ◽  
Innovative Strategy ◽  
Oxide Supports ◽  
Heterogeneous Catalytic ◽  
Highly Active ◽  
Electron Sink ◽  
Nitrogen Vacancies

AbstractActivation of O2 is a critical step in heterogeneous catalytic oxidation. Here, the concept of increased electron donors induced by nitrogen vacancy is adopted to propose an efficient strategy to develop highly active and stable catalysts for molecular O2 activation. Carbon nitride with nitrogen vacancies is prepared to serve as a support as well as electron sink to construct a synergistic catalyst with Pt nanoparticles. Extensive characterizations combined with the first-principles calculations reveal that nitrogen vacancies with excess electrons could effectively stabilize metallic Pt nanoparticles by strong p-d coupling. The Pt atoms and the dangling carbon atoms surround the vacancy can synergistically donate electrons to the antibonding orbital of the adsorbed O2. This synergistic catalyst shows great enhancement of catalytic performance and durability in toluene oxidation. The introduction of electron-rich non-oxide substrate is an innovative strategy to develop active Pt-based oxidation catalysts, which could be conceivably extended to a variety of metal-based catalysts for catalytic oxidation.

Zn2+ stabilized Pd clusters with enhanced covalent metal–support interaction via the formation of Pd–Zn bonds to promote catalytic thermal stability

Nanoscale ◽  
2020 ◽  
Vol 12 (27) ◽  
pp. 14825-14830
Author(s):  
Kai-Qiang Jing ◽  
Yu-Qing Fu ◽  
Zhi-Qiao Wang ◽  
Zhe-Ning Chen ◽  
Hong-Zi Tan ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Adsorption Energy ◽  
Catalytic Performance ◽  
Support Interaction ◽  
Metal Support Interaction ◽  
Metal Support ◽  
Pd Clusters

Zn2+-Modified MgAl-LDH with ultra-low Pd cluster loading was synthesized. The higher adsorption energy and strong covalent metal–support interaction via forming Pd–Zn bonds over Pd/ZnMgAl-LDH account for the robust catalytic performance.

Influences of doping and thermal stability on the catalytic performance of CuO/Ce20M1Ox (M = Zr, Cr, Mn, Fe, Co, Sn) catalysts for NO reduction by CO

RSC Advances ◽  
2016 ◽  
Vol 6 (114) ◽  
pp. 113630-113647 ◽  
Author(s):  
Changshun Deng ◽  
Junning Qian ◽  
Chuxuan Yu ◽  
Yunan Yi ◽  
Pan Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
No Reduction ◽  
Metal Cations ◽  
Catalytic Performance ◽  
Variable Valence ◽  
No Reduction By Co ◽  
Catalysts For No Reduction

The doping of variable valence metal cations into CeO2 is beneficial for catalytic NO reduction by CO.

scholarly journals Pt-Promoted Tungsten Carbide Nanostructures on Mesoporous Pinewood-Derived Activated Carbon for Catalytic Oxidation of Formaldehyde at Low Temperatures

2020 ◽  
Vol 1 (2) ◽  
pp. 86-105
Author(s):  
Qiangu Yan ◽  
Zhiyong Cai
Keyword(s):  
Electron Microscopy ◽  
Activated Carbon ◽  
Relative Humidity ◽  
Tungsten Carbide ◽  
Catalytic Oxidation ◽  
Space Velocity ◽  
Catalytic Performance ◽  
Inert Atmosphere ◽  
Bet Surface Area ◽  
Formaldehyde Concentration

Tungsten carbide (WC) nanostructures were prepared by carbothermal reduction (CR) of tungsten-impregnated pinewood-derived activated carbon (AC) at 1000 °C under an inert atmosphere. Brunauer-Emmet-Teller (BET) surface area, pore structures of the AC, and catalyst samples were evaluated by N2 adsorption-desorption experiments. The structures of the catalysts were characterized using X-ray powder diffraction (XRD). The morphologies and particle structures of the synthesized WC nanoparticles were investigated by field emission scanning electron microscopy (FESEM) and high-resolution transmission electron microscopy (HRTEM). The WC/AC material was used as support of the platinum catalysts for catalytic oxidation of formaldehyde (HCHO) from interior sources. Pt-WC/AC catalysts with different platinum loadings were assessed for the catalytic oxidation of HCHO at low temperature. The catalytic performance was found to be significantly influenced by reaction temperature, initial formaldehyde concentration, relative humidity, and space velocity. The testing results demonstrated that HCHO can be totally oxidized by the 1 wt% Pt-WC/AC catalyst in the gas hourly space velocity (GHSV) = 50,000 h−1 at 30 °C with a relative humidity (RH) of 40%.

Assessing the formation of cobalt carbide and its catalytic performance under realistic reaction conditions and tuning product selectivity in a cobalt-based FTS reaction

2019 ◽  
Vol 9 (12) ◽  
pp. 3238-3258 ◽  
Author(s):  
Qiang Lin ◽  
Bing Liu ◽  
Feng Jiang ◽  
Xuejin Fang ◽  
Yuebing Xu ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Product Selectivity ◽  
Reaction Conditions ◽  
Catalytic Behavior ◽  
Cobalt Carbide

The formation of cobalt carbide (Co2C) and its catalytic behavior were systematically investigated using realistic reaction conditions.

scholarly journals Tuning product selectivity in the catalytic oxidation of glycerol by employing metal-ZSM-11 materials

2020 ◽  
Vol 44 (11) ◽  
pp. 4363-4375 ◽  
Author(s):  
Eliana Diguilio ◽  
Emilce D. Galarza ◽  
Marcelo E. Domine ◽  
Liliana B. Pierella ◽  
María S. Renzini
Keyword(s):  
Lactic Acid ◽  
Catalytic Oxidation ◽  
Selective Oxidation ◽  
Product Selectivity ◽  
Mesoporous Zeolites

Selective oxidation of glycerol towards dihidoxyacetone and lactic acid, employing micro/mesoporous zeolites with copper(ii) and chromium(iii).

Pt/UiO-66 Nanocomposites as Catalysts for CO2 Methanation Process

2019 ◽  
Vol 19 (6) ◽  
pp. 3187-3196 ◽  
Author(s):  
Maria Mihet ◽  
Gabriela Blanita ◽  
Monica Dan ◽  
Lucian Barbu-Tudoran ◽  
Mihaela D Lazar
Keyword(s):  
Thermal Stability ◽  
Surface Area ◽  
Metal Organic Framework ◽  
Catalytic Performance ◽  
Molar Ratio ◽  
High Dispersion ◽  
Co2 Methanation ◽  
Preparation Methods ◽  
Good Thermal Stability ◽  
Catalytic Support

Pt/UiO-66 nanocomposites with platinum target concentration of 3 wt.% were prepared by 3 preparation methods, characterized and tested in the CO2 methanation process. Choice of the microporous UiO-66 metal-organic framework (Zr6O4(OH)4 with 1,4-benzene-dicarboxylate ligand) as catalytic support was motivated by the CO2 chemisorption capacity (proven by CO2-TPD profiles), large specific surface area (1477 m2/g) which favors a high dispersion of metal nanoparticles and good thermal stability. The preparation methods for the Pt/UiO-66 nanocomposites are: (1) wetimpregnation followed by reduction in H2 at 200 °C for 2 h; (2) wet-impregnation followed by reduction with an aqueous solution of NaBH4; and (3) “double-solvent” method, followed by reduction with NaBH4. The UiO-66 based nanocomposites were characterized by N2 adsorption–desorption (BET method), XRD, and SEM/TEM. The Pt/UiO-66 catalyst prepared by method 3 was chosen for catalytic testing due to its highest surface area, smallest platinum nanoparticles (PtNPs) size, the localization of PtNPs both on the grain’s internal and external surface and best thermal stability in the desired temperature range. Its capacity to adsorb and activate CO2 and H2 was evaluated in thermo-programmed desorption experiments (H2-TPD and CO2-TPD). Hydrogen is molecularly adsorbed, while CO2 is adsorbed both molecularly and dissociatively. The catalytic performance in the CO2 methanation process was evaluated by Temperature Programmed Reactions (TPRea, 2 °C/min, 30–350 °C), at atmospheric pressure. The best results were obtained at 350 °C, CO2:H2 molar ratio of 1:5.2 and GHSV ═ 1650 h−1. In these conditions CO2 conversion is almost 50% and CH4 selectivity is 36%, the rest of the converted CO2 being transformed in CO.

scholarly journals Au–Ag and Pt–Ag bimetallic nanoparticles@halloysite nanotubes: morphological modulation, improvement of thermal stability and catalytic performance

RSC Advances ◽  
2018 ◽  
Vol 8 (19) ◽  
pp. 10237-10245 ◽  
Author(s):  
Siyu Li ◽  
Feng Tang ◽  
Huixin Wang ◽  
Junran Feng ◽  
Zhaoxia Jin
Keyword(s):  
Thermal Stability ◽  
Bimetallic Nanoparticles ◽  
Catalytic Performance ◽  
Halloysite Nanotubes ◽  
Monometallic Nanoparticles

Bimetallic Au–Ag@HNT and Pt–Ag@HNT nanocages showed significantly improved efficiency in the oxidation of o-phenylenediamine as peroxidase-like catalyst compared with corresponding monometallic nanoparticles.

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