scholarly journals Phosphorus-Doped Carbon Supported Vanadium Phosphate Oxides for Catalytic Oxidation of 5-Hydroxymethylfurfural to 2,5-Diformylfuran

Processes ◽  
2020 ◽  
Vol 8 (10) ◽  
pp. 1273
Author(s):  
Sha Wen ◽  
Kai Liu ◽  
Yi Tian ◽  
Yanping Xiang ◽  
Xianxiang Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Selective Oxidation ◽  
High Catalytic Activity ◽  
Temperature Reaction ◽  
Vanadium Phosphate ◽  
Catalyst Amount ◽  
Air Atmosphere ◽  
Vpo Catalyst ◽  
Loading Amount ◽  
Phosphorus Doped

2,5-diformylfuran (DFF) is an important downstream product obtained by selective oxidation of the biomass-based platform compound 5-hydroxymethylfurfural (HMF). In this study, a phosphorus-doped carbon (P-C) supported vanadium phosphate oxide (VPO) catalyst was successfully prepared and showed remarkably high catalytic activity in the selective oxidation of HMF to produce DFF with air as an oxidant. The effects of the reaction temperature, reaction time, solvent, catalyst amount, and VPO loading amount were investigated. The results showed that an HMF conversion rate of 100% and a DFF yield of 97.0% were obtained under suitable conditions, and DMSO was found to be the most suitable solvent under an air atmosphere.

PtAu alloy nanoparticles supported on thermally expanded graphene oxide as a catalyst for the selective oxidation of glycerol

RSC Advances ◽  
2015 ◽  
Vol 5 (47) ◽  
pp. 37112-37118 ◽  
Author(s):  
Gao-Yuan Yang ◽  
Shuai Shao ◽  
Yi-Hu Ke ◽  
Chun-Ling Liu ◽  
Hui-Fang Ren ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Catalytic Activity ◽  
Selective Oxidation ◽  
High Catalytic Activity ◽  
Alloy Nanoparticles

Thermally expanded graphene oxide supported PtAu alloy nanoparticles showed high catalytic activity in the oxidation of glycerol in base-free aqueous solution.

In situ assembly of well-dispersed Ni nanoparticles on silica nanotubes and excellent catalytic activity in 4-nitrophenol reduction

Nanoscale ◽  
2014 ◽  
Vol 6 (19) ◽  
pp. 11181-11188 ◽  
Author(s):  
Shenghuan Zhang ◽  
Shili Gai ◽  
Fei He ◽  
Shujiang Ding ◽  
Lei Li ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Catalytic Activity ◽  
High Catalytic Activity ◽  
Ni Nanoparticles ◽  
Small Particle Size ◽  
Reduction Strategy ◽  
Nitrophenol Reduction ◽  
Nanotube Composites ◽  
Loading Amount

Ni nanoparticle/silica nanotube composites with small particle size, good dispersion and high loading amount of Ni NPs was synthesized using an in situ thermal decomposition and reduction strategy. The composite exhibited high catalytic activity and good stability in 4-NP reduction.

Hollow porous Cu–Au particles with high catalytic activity for the reduction of 4-nitrophenol

CrystEngComm ◽  
2020 ◽  
Vol 22 (26) ◽  
pp. 4386-4392
Author(s):  
Jianwei Jiang ◽  
Sungho Yoon ◽  
Longhai Piao
Keyword(s):  
Catalytic Activity ◽  
Selective Oxidation ◽  
Electrocatalytic Activity ◽  
Hollow Structure ◽  
High Catalytic Activity

A Cu-based bimetallic hollow structure can be effectively used to enhance the selective oxidation and electrocatalytic activity of a catalyst and to reduce its cost.

Effects of Diameters on the Catalytic Activity of Spherical V-MCM-41 in the Selective Oxidation of Styrene

2012 ◽  
Vol 549 ◽  
pp. 137-140
Author(s):  
Yu Chen ◽  
Hua Qin ◽  
Xiao Bo Shi ◽  
Yan Kong
Keyword(s):  
Catalytic Activity ◽  
Hydrothermal Method ◽  
Selective Oxidation ◽  
Heterogeneous Catalysts ◽  
Molar Ratio ◽  
High Catalytic Activity ◽  
Precise Control ◽  
Mcm 41

Spherical V-MCM-41s with different diameter are synthesized by direct hydrothermal method through the precise control over the molar ratio of NaOH/TEOS. Vanadium supported on spherical MCM-41s is also prepared by impregnation methods. They are used as heterogeneous catalysts for the oxidation of styrene with H2O2 as oxidant. The results suggest that all catalysts have high catalytic activity, which increases with their diameter decreasing.

Nitrogen doped carbon spheres with wrinkled cages for the selective oxidation of 5-hydroxymethylfurfural to 5-formyl-2-furancarboxylic acid

2021 ◽  
Vol 57 (16) ◽  
pp. 2005-2008
Author(s):  
Jiaping Zhu ◽  
Chaojian Yao ◽  
Ayan Maity ◽  
Jielai Xu ◽  
Tong Zhan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Selective Oxidation ◽  
High Catalytic Activity ◽  
Carbon Spheres ◽  
Nitrogen Doped ◽  
Nitrogen Doped Carbon

Nitrogen doped carbon spheres with wrinkled cages exhibited high catalytic activity and selectivity in the oxidation of 5-hydroxymethylfurfural to 5-formyl-2-furancarboxylic acid using TBHP as the oxidant.

Catalytic Methoxycarbonylation of 1,6-Hexamethylenediamine with Methyl Carbamate to Dimethylhexane-1,6-Dicarbamate

2013 ◽  
Vol 634-638 ◽  
pp. 490-493
Author(s):  
Bing Han ◽  
Wen Bo Zhao ◽  
Xian Ye Qin ◽  
Yan Hong Li ◽  
Wei Wei
Keyword(s):  
Catalytic Activity ◽  
Reaction Time ◽  
Metal Oxides ◽  
Reaction Temperature ◽  
Lead Dioxide ◽  
Temperature Reaction ◽  
Catalyst Amount ◽  
Methyl Carbonate

A series of metal oxides were employed as catalysts for the synthesis of dimethylhexane -1,6-dicarbamate(HDC) from 1,6-hexamethylenediamine(HDA) and methyl carbonate(MC). Lead dioxide showed excellent catalytic activity, 100% HDA conversion and 93% HDC yield could be achieved at 463K for 6h. The effects of reaction temperature, reaction time and catalyst amount on the yield of HDC were investigated in details.

scholarly journals Copper(ii)-containing tungstotellurates(vi): syntheses, structures and their catalytic performances in selective oxidation of thioethers

RSC Advances ◽  
2020 ◽  
Vol 10 (38) ◽  
pp. 22515-22521
Author(s):  
Xuanyao Li ◽  
Peihe Li ◽  
Jinghai Liu ◽  
Zhengguo Lin ◽  
Changwen Hu
Keyword(s):  
Catalytic Activity ◽  
Selective Oxidation ◽  
High Catalytic Activity ◽  
Ambient Conditions ◽  
Very High ◽  
Catalytic Performances

Two copper(ii)-containing tungstotellurates(vi) were synthesized and present very high catalytic activity for the selective oxidation of thioethers under ambient conditions.

Enhanced catalytic activity of low-Pt content nanocatalysts supported on hollow carbon spheres for the ORR in alkaline media

MRS Advances ◽  
2020 ◽  
Vol 5 (57-58) ◽  
pp. 2961-2972
Author(s):  
P.C. Meléndez-González ◽  
E. Garza-Duran ◽  
J.C. Martínez-Loyola ◽  
P. Quintana-Owen ◽  
I.L. Alonso-Lemus ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Anion Exchange ◽  
Average Particle Size ◽  
Synthesis Method ◽  
Alkaline Media ◽  
High Catalytic Activity ◽  
Average Particle ◽  
Carbon Spheres ◽  
Hollow Carbon ◽  
Hollow Carbon Spheres

In this work, low-Pt content nanocatalysts (≈ 5 wt. %) supported on Hollow Carbon Spheres (HCS) were synthesized by two routes: i) colloidal conventional polyol, and ii) surfactant-free Bromide Anion Exchange (BAE). The nanocatalysts were labelled as Pt/HCS-P and Pt/HCS-B for polyol and BAE, respectively. The physicochemical characterization of the nanocatalysts showed that by following both methods, a good control of chemical composition was achieved, obtaining in addition well dispersed nanoparticles of less than 3 nm TEM average particle size (d) on the HCS. Pt/HCS-B contained more Pt0 species than Pt/HCS-P, an effect of the synthesis method. In addition, the structure of the HCS remains more ordered after BAE synthesis, compared to polyol. Regarding the catalytic activity for the Oxygen Reduction Reaction (ORR) in 0.5 M KOH, Pt/HCS-P and Pt/HCS-B showed a similar performance in terms of current density (j) at 0.9 V vs. RHE than the benchmark commercial 20 wt. % Pt/C. However, Pt/HCS-P and Pt/HCS-B demonstrated a 6 and 5-fold increase in mass catalytic activity compared to Pt/C, respectively. A positive effect of the high specific surface area of the HCS and its interactions with metal nanoparticles and electrolyte, which promoted the mass transfer, increased the performance of Pt/HCS-P and Pt/HCS-B. The high catalytic activity showed by Pt/HCS-B and Pt/HCS-P for the ORR, even with a low-Pt content, make them promising cathode nanocatalysts for Anion Exchange Membrane Fuel Cells (AEMFC).

Ordered Intermetallic Nanoparticles with High Catalytic Activity Prepared by an Electrochemically Induced Phase Transformation

2019 ◽  
Author(s):  
Du Sun ◽  
yunfei wang ◽  
Kenneth Livi ◽  
chuhong wang ◽  
ruichun luo ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Diffusion Mechanism ◽  
Reduction Reaction ◽  
Atomic Scale ◽  
High Catalytic Activity ◽  
Ambient Conditions ◽  
Magnetic Devices ◽  
Disordered Alloys ◽  
Ordered Intermetallic ◽  
Intermetallic Nanoparticles

<div> <p>The synthesis of alloys with long range atomic scale ordering (ordered intermetallics) is an emerging field of nanochemistry. Ordered intermetallic nanoparticles are useful for a wide variety of applications such as catalysis, superconductors, and magnetic devices. However, the preparation of nanostructured ordered intermetallics is challenging in comparison to disordered alloys, hindering progress in materials development. We report a process for converting colloidally synthesized ordered intermetallic PdBi<sub>2</sub> to ordered intermetallic Pd<sub>3</sub>Bi nanoparticles under ambient conditions by an electrochemically induced phase transition. The low melting point of PdBi<sub>2</sub> corresponds to low vacancy formation energies which enables the facile removal of the Bi from the surface, while simultaneously enabling interdiffusion of the constituent atoms via a vacancy diffusion mechanism under ambient conditions. The resulting phase-converted ordered intermetallic Pd<sub>3</sub>Bi exhibits 11x and 3.5x higher mass activty and high methanol tolerance for the oxygen reduction reaction compared to Pt/C and Pd/C, respectively,which is the highest reported for a Pd-based catalyst, to the best of our knowledge. These results establish a key development in the synthesis of noble metal rich ordered intermetallic phases with high catalytic activity, and sets forth guidelines for the design of ordered intermetallic compounds under ambient conditions.</p> </div>

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