High Catalytic Activity of Pd1/ZnO(101̅0) toward Methanol Partial Oxidation: A DFT+KMC Study

ACS Catalysis ◽  
2018 ◽  
Vol 8 (6) ◽  
pp. 5553-5569 ◽  
Author(s):  
Takat B. Rawal ◽  
Shree Ram Acharya ◽  
Sampyo Hong ◽  
Duy Le ◽  
Yu Tang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Partial Oxidation ◽  
High Catalytic Activity ◽  
Methanol Partial Oxidation

High catalytic activity of V2O5-ZrO2 modified with H2SO4 for propene partial oxidation

1995 ◽  
Vol 55 (2) ◽  
pp. 325-332 ◽  
Author(s):  
Jong Rack Sohn ◽  
Young Il Pae ◽  
Man Young Park ◽  
Sung Guk Jo
Keyword(s):  
Catalytic Activity ◽  
Partial Oxidation ◽  
High Catalytic Activity

Catalytic activity of electrospun Ag and Ag/carbon composite fibres in partial methanol oxidation

2015 ◽  
Vol 5 (2) ◽  
pp. 1153-1162 ◽  
Author(s):  
V. Halperin ◽  
G. E. Shter ◽  
V. Gelman ◽  
D. M. Peselev ◽  
M. Mann-Lahav ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Methanol Oxidation ◽  
Partial Oxidation ◽  
Oxidation Process ◽  
Carbon Composite ◽  
Carbon Fibres ◽  
Methanol Partial Oxidation ◽  
Highly Active

A feasibility of electrospinning in producing of highly active Ag and Ag/carbon fibres based catalysts is demonstrated in methanol partial oxidation process (PMO).

The catalytic activity of Pt6M (M=Pt, Ru, Sn) cluster for methanol partial oxidation

2015 ◽  
Vol 1061 ◽  
pp. 52-59 ◽  
Author(s):  
Haixia Xu ◽  
Min Zhang ◽  
Yanyang Chen ◽  
Huiling Liu ◽  
Kejin Xu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Partial Oxidation ◽  
Methanol Partial Oxidation

Facet Effect of Ceria Nanoparticles on Platinum Dispersion and Catalytic Activity of Methanol Partial Oxidation

2021 ◽  
Author(s):  
Kasala Prabhakar Reddy ◽  
Han Seul Choi ◽  
Daeho Kim ◽  
Minkee Choi ◽  
Ryong Ryoo ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Partial Oxidation ◽  
Methyl Formate ◽  
Ceria Nanoparticles ◽  
Product Selectivity ◽  
Turnover Frequency ◽  
Methanol Partial Oxidation ◽  
Ceria Catalysts ◽  
Platinum Dispersion

The effect of platinum–supported nano–shaped ceria catalysts on methanol partial oxidation and methyl formate product selectivity has been investigated. Pt supported on a CeO2 nanocube catalyst had higher turnover frequency...

Thermally stable core–shell Ni/nanorod-CeO2@SiO2 catalyst for partial oxidation of methane at high temperatures

Nanoscale ◽  
2018 ◽  
Vol 10 (29) ◽  
pp. 14031-14038 ◽  
Author(s):  
Shaohong Zhu ◽  
Xinyi Lian ◽  
Tingting Fan ◽  
Zhou Chen ◽  
Yunyun Dong ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Catalytic Activity ◽  
High Temperatures ◽  
Partial Oxidation ◽  
Partial Oxidation Of Methane ◽  
Core Shell ◽  
High Catalytic Activity ◽  
Good Thermal Stability ◽  
Oxidation Of Methane ◽  
Stable Core

Core–shell Ni/nanorod-CeO2@SiO2 catalyst prepared by a microemulsion method shows high catalytic activity and good thermal stability for the partial oxidation of methane.

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>

Nickel (II) and oxovanadium (IV) complexes supported on MCM-41 mesoporous and their application in catalytic selective sulfide and thiol oxidation

2020 ◽  
Vol 23 ◽  
Author(s):  
Mohsen Nikoorazm ◽  
Maryam Khanmoradi ◽  
Masoumeh Sayadian
Keyword(s):  
Catalytic Activity ◽  
Room Temperature ◽  
Sol Gel ◽  
Reaction Times ◽  
Significant Loss ◽  
Spectral Studies ◽  
High Catalytic Activity ◽  
Catalytic Systems ◽  
Solvent Free Conditions ◽  
Mcm 41

Introduction:: MCM-41 was synthesized using the sol-gel method. Then two new transition metal complexes of Nickel (II) and Vanadium (IV), were synthesized by immobilization of adenine (6-aminopurine) into MCM-41 mesoporous. The compounds have been characterized by XRD, TGA, SEM, AAS and FT-IR spectral studies. Using these catalysts provided an efficient and enantioselective procedure for oxidation of sulfides to sulfoxides and oxidative coupling of thiols to their corresponding disulfides using hydrogen peroxide at room temperature. Materials and Methods:: To a solution of sulfide or thiol (1 mmol) and H2O2 (5 mmol), a determined amount of the catalyst was added. The reaction mixture was stirred at room temperature for the specific time under solvent free conditions. The progress of the reaction was monitored by TLC using n-hexane: acetone (8:2). Afterwards, the catalyst was removed from the reaction mixture by centrifugation and, then, washed with dichloromethane in order to give the pure products. Results:: All the products were obtained in excellent yields and short reaction times indicating the high activity of the synthesized catalysts. Besides, the catalysts can be recovered and reused for several runs without significant loss in their catalytic activity. Conclusion:: These catalytic systems furnish the products very quickly with excellent yields and VO-6AP-MCM-41 shows high catalytic activity compared to Ni-6AP-MCM-41.

Mechanisms of methane decomposition and carbon species oxidation on the Pr0.42Sr0.6Co0.2Fe0.7Nb0.1O3−σ electrode with high catalytic activity

2015 ◽  
Vol 3 (45) ◽  
pp. 22816-22823 ◽  
Author(s):  
Peng Zhang ◽  
Guoqing Guan ◽  
Deni S. Khaerudini ◽  
Xiaogang Hao ◽  
Chunfeng Xue ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Carbon Deposition ◽  
Methane Decomposition ◽  
High Catalytic Activity ◽  
Carbon Species

Carbon deposition characteristics on PSCFN and Ni–YSZ due to thermal CH4 decomposition are investigated by using TPR technique.

scholarly journals Oscillatory Behaviour of Ni Supported on ZrO2 in the Catalytic Partial Oxidation of Methane as Determined by Activation Procedure

Materials ◽  
2021 ◽  
Vol 14 (10) ◽  
pp. 2495
Author(s):  
Daniela Pietrogiacomi ◽  
Maria Cristina Campa ◽  
Ida Pettiti ◽  
Simonetta Tuti ◽  
Giulia Luccisano ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Partial Oxidation ◽  
Active Sites ◽  
Direct Reduction ◽  
Partial Oxidation Of Methane ◽  
Catalytic Partial Oxidation ◽  
Oxidation Of Methane ◽  
Short Contact Time ◽  
Oxidation Reduction ◽  
Ni Species

Ni/ZrO2 catalysts, active and selective for the catalytic partial oxidation of methane to syngas (CH4-CPO), were prepared by the dry impregnation of zirconium oxyhydroxide (Zhy) or monoclinic ZrO2 (Zm), calcination at 1173 K and activation by different procedures: oxidation-reduction (ox-red) or direct reduction (red). The characterization included XRD, FESEM, in situ FTIR and Raman spectroscopies, TPR, and specific surface area measurements. Catalytic activity experiments were carried out in a flow apparatus with a mixture of CH4:O2 = 2:1 in a short contact time. Compared to Zm, Zhy favoured the formation of smaller NiO particles, implying a higher number of Ni sites strongly interacting with the support. In all the activated Ni/ZrO2 catalysts, the Ni–ZrO2 interaction was strong enough to limit Ni aggregation during the catalytic runs. The catalytic activity depended on the activation procedures; the ox-red treatment yielded very active and stable catalysts, whereas the red treatment yielded catalysts with oscillating activity, ascribed to the formation of Niδ+ carbide-like species. The results suggested that Ni dispersion was not the main factor affecting the activity, and that active sites for CH4-CPO could be Ni species at the boundary of the metal particles in a specific configuration and nuclearity.

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