Multinuclear transition metal-containing polyoxometalates constructed from Nb/W mixed-addendum precursor: synthesis, structures and catalytic performance

2021 ◽  
Author(s):  
Wanru Xiao ◽  
Shujun Li ◽  
Yubin Ma ◽  
Na Li ◽  
Yue Zhao ◽  
...  
Keyword(s):  
Transition Metal ◽  
Catalytic Performance ◽  
Precursor Synthesis

Four new transition metal-containing Nb/W Mixed-addendum POMs trimers with the formula of H19[M4(H2O)X(P2W15Nb3O62)3]·m(HCOOH)·nH2O (M = Cu, x = 15, m = 0, n = 21, Cu-POM ; M = Co,...

Efficient Modulation of Catalytic Performance of Electrocatalytic Nitrogen Reduction with Transition Metal Anchored N/O-codoped Graphene by Coordination Engineering

2021 ◽  
Author(s):  
Xiaolin Wang ◽  
Li-Ming Yang
Keyword(s):  
Nitrogen Fixation ◽  
Transition Metal ◽  
High Throughput ◽  
First Principles ◽  
High Throughput Screening ◽  
Catalytic Performance ◽  
Nitrogen Reduction ◽  
Highly Efficient ◽  
First Time

We for the first time report the discovery of a series of highly efficient electrocatalysts, i.e., transition metal anchored N/O-codoped graphene, for nitrogen fixation via high-throughput screening combined with first-principles...

Chemical conversion based on crystal facet effect of transition metal oxide and construction methods for sharp-faced nanocrystals

2022 ◽  
Author(s):  
huixiang wang ◽  
Xiaobo Ren ◽  
Zhong Liu ◽  
Baoliang Lv
Keyword(s):  
Transition Metal ◽  
Metal Oxide ◽  
Gas Sensing ◽  
Transition Metal Oxide ◽  
Chemical Conversion ◽  
Catalytic Performance ◽  
Crystal Facet ◽  
Heterogeneous Catalytic ◽  
Construction Methods

The in-depth researches have found that the nanocrystal facet of transition metal oxide (TMO) greatly affects its heterogeneous catalytic performance, as well as the property of photocatalysis, gas sensing, electrochemical...

Doping effect of transition metals (Zr, Mn, Ti and Ni) on well-shaped CuO/CeO2(rods): nano/micro structure and catalytic performance for selective oxidation of CO in excess H2

2018 ◽  
Vol 20 (40) ◽  
pp. 25983-25994 ◽  
Author(s):  
Xiaolin Guo ◽  
Zhihuan Qiu ◽  
Jianxin Mao ◽  
Renxian Zhou
Keyword(s):  
Transition Metal ◽  
Transition Metals ◽  
Selective Oxidation ◽  
Catalytic Performance ◽  
Doping Effect ◽  
Oxidation Of Co ◽  
Micro Structure

Investigation of how transition metal dopants regulate the microstructure of CuO/CeO2 nanorods, using XRD Reitveld refinements.

Aqueous-phase synthesis of layered double hydroxide nanoplates as catalysts for the oxygen evolution reaction

2018 ◽  
Vol 47 (48) ◽  
pp. 17342-17348 ◽  
Author(s):  
Euiyoung Jung ◽  
Jae Kyeom Kim ◽  
Hyungsuk Choi ◽  
Min Hyung Lee ◽  
Taekyung Yu
Keyword(s):  
Aqueous Solution ◽  
Transition Metal ◽  
Oxygen Evolution ◽  
Layered Double Hydroxide ◽  
Aqueous Phase ◽  
Oxygen Evolution Reaction ◽  
Metal Salt ◽  
Catalytic Performance ◽  
Phase Synthesis ◽  
Double Hydroxide

Transition metal LDH nanoplates were synthesized by heating an aqueous solution containing a metal salt, PEG, and octylamine. The LDH nanoplates showed comparable electrochemical catalytic performance for the oxygen evolution reaction.

scholarly journals Highly Active Transition Metal-Promoted CuCeMgAlO Mixed Oxide Catalysts Obtained from Multicationic LDH Precursors for the Total Oxidation of Methane

Catalysts ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 613
Author(s):  
Hussein Mahdi S. Al-Aani ◽  
Mihaela M. Trandafir ◽  
Ioana Fechete ◽  
Lucia N. Leonat ◽  
Mihaela Badea ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transition Metal ◽  
Mixed Oxide ◽  
Mixed Oxides ◽  
Catalytic Performance ◽  
Atomic Ratio ◽  
Total Oxidation ◽  
X Ray ◽  
Oxidation Of Methane ◽  
Al2o3 Catalyst

To improve the catalytic performance of an active layered double hydroxide (LDH)-derived CuCeMgAlO mixed oxide catalyst in the total oxidation of methane, it was promoted with different transition-metal cations. Thus, two series of multicationic mixed oxides were prepared by the thermal decomposition at 750 °C of their corresponding LDH precursors synthesized by coprecipitation at constant pH of 10 under ambient atmosphere. The first series of catalysts consisted of four M(3)CuCeMgAlO mixed oxides containing 3 at.% M (M = Mn, Fe, Co, Ni), 15 at.% Cu, 10 at.% Ce (at.% with respect to cations), and with Mg/Al atomic ratio fixed to 3. The second series consisted of four Co(x)CuCeMgAlO mixed oxides with x = 1, 3, 6, and 9 at.% Co, while keeping constant the Cu and Ce contents and the Mg/Al atomic ratio. All the mixed oxides were characterized by powder X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) coupled with X-ray energy dispersion analysis (EDX), X-ray photoelectron spectroscopy (XPS), nitrogen adsorption-desorption at −196 °C, temperature-programmed reduction under hydrogen (H2-TPR), and diffuse reflectance UV-VIS spectroscopy (DR UV-VIS), while thermogravimetric and differential thermal analyses (TG-DTG-DTA) together with XRD were used for the LDH precursors. The catalysts were evaluated in the total oxidation of methane, a test reaction for volatile organic compounds (VOC) abatement. Their catalytic performance was explained in correlation with their physicochemical properties and was compared with that of a reference Pd/Al2O3 catalyst. Among the mixed oxides studied, Co(3)CuCeMgAlO was found to be the most active catalyst, with a temperature corresponding to 50% methane conversion (T50) of 438 °C, which was only 19 °C higher than that of a reference Pd/Al2O3 catalyst. On the other hand, this T50 value was ca. 25 °C lower than that observed for the unpromoted CuCeMgAlO system, accounting for the improved performance of the Co-promoted catalyst, which also showed a good stability on stream.

scholarly journals Selective Oxidation of Glycerol Using 3% H2O2 Catalyzed by Supported Nano-Au Catalysts

Catalysts ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 505 ◽  
Author(s):  
Xiaoli Wang ◽  
Gongde Wu ◽  
Tongfa Jin ◽  
Jie Xu ◽  
Shihao Song
Keyword(s):  
Transition Metal ◽  
Metal Oxides ◽  
Selective Oxidation ◽  
Mixed Oxide ◽  
Transition Metal Oxides ◽  
Mixed Oxides ◽  
Catalytic Performance ◽  
Glyceric Acid ◽  
Glycerol Conversion ◽  
Composition And Structure

A series of transition metal oxides or mixed oxides supported nano-Au catalysts were prepared for the selective oxidation of glycerol to glyceric acid using 3% H2O2. It was found that the composition and structure of supports significantly influenced the catalytic performance of catalysts. The mesoporous trimetal mixed oxide (CuNiAlO) supported nano-Au catalysts were more active in comparison with the others. In the present catalytic system, the highest glycerol conversion was 90.5%, while the selectivity of glyceric acid could reach 72%. Moreover, the catalytic performance remained after 11 times of reaction.

Multimetal-MOF-derived transition metal alloy NPs embedded in an N-doped carbon matrix: highly active catalysts for hydrogenation reactions

2016 ◽  
Vol 4 (26) ◽  
pp. 10254-10262 ◽  
Author(s):  
Jilan Long ◽  
Kui Shen ◽  
Liang Chen ◽  
Yingwei Li
Keyword(s):  
Transition Metal ◽  
Carbon Matrix ◽  
Catalytic Performance ◽  
Metal Alloy ◽  
Transfer Hydrogenation ◽  
Transition Metal Alloy ◽  
Highly Active ◽  
Hydrogenation Reactions ◽  
Excellent Catalytic Performance ◽  
Hydrogenation Of Nitriles

We report a MOF-templated route to synthesize transition metal alloy NPs embedded in an N-doped carbon matrix. The alloy-based catalysts exhibited excellent catalytic performance and widespread substrate applicability for the transfer hydrogenation of nitriles.

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