scholarly journals Physicochemical properties of nanostructured Pd/lanthanide-doped ceria spheres with high catalytic activity for CH4 combustion

2018 ◽  
Vol 6 (17) ◽  
pp. 7488-7499 ◽  
Author(s):  
Rodolfo O. Fuentes ◽  
Leandro M. Acuña ◽  
A. Gabriela Leyva ◽  
Richard T. Baker ◽  
Huiyan Pan ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Physicochemical Properties ◽  
High Activity ◽  
High Catalytic Activity ◽  
Doped Ceria ◽  
Total Conversion ◽  
Ch4 Combustion

Nanostructured 1 wt% Pd/LnDC spheres exhibited high activity for CH4 oxidation with total conversion of CH4 attained at a temperature below 400 °C.

Controllable synthesis of urchin-like hierarchical superstructure MOFs with high catalytic activity and stability

2021 ◽  
Author(s):  
Zhanke Wang ◽  
Lei Ge ◽  
Guangxu Zhang ◽  
Rongrong Gao ◽  
Hao Wang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Activity ◽  
Metal Organic Frameworks ◽  
High Catalytic Activity ◽  
Controllable Synthesis ◽  
Metal Organic ◽  
Self Assembled

A novel dissolution-crystallization strategy was developed to synthesize urchin-like superstructure metal-organic frameworks (MOFs) with self-assembled 1D nanorods. The superstructure MOFs not only inherit the high activity of nano-sized MOFs but...

PtRu Nanoparticle Catalytic Activity Enhanced by the Ligand Effect

2008 ◽  
Vol 1127 ◽  
Author(s):  
Shuji Goto ◽  
Yuli Li ◽  
Naomi Nagasawa ◽  
Tadashi Senoo ◽  
Kazuhiro Noda ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Fuel Cell ◽  
High Activity ◽  
Direct Methanol Fuel Cell ◽  
Metal Content ◽  
High Catalytic Activity ◽  
Ligand Effect ◽  
Direct Methanol ◽  
Methanol Fuel Cell ◽  
Ptru Nanoparticles

ABSTRACTWe synthesized a methanol electrocatalyst with high activity and low noble metal content. The electrocatalyst consists of carbon&supported PtRu nanoparticles, which have 1-2 Pt monoatomic layers on Ru nanocores. In spite of the pure Pt surface, the catalyst showed high catalytic activity when used in the anode of a direct methanol fuel cell. Clearly the underlying Ru atoms modified the property of the surface Pt atoms, bringing about the high catalytic activity.

Zeolite Y nanosheet assembled palladium catalysts with high catalytic activity and selectivity in the vinylation of thiophenes

2016 ◽  
Vol 52 (15) ◽  
pp. 3115-3118 ◽  
Author(s):  
Wenqian Fu ◽  
Yu Feng ◽  
Zhongxue Fang ◽  
Qun Chen ◽  
Ting Tang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
High Activity ◽  
Palladium Catalysts ◽  
Zeolite Y ◽  
High Catalytic Activity ◽  
Pd Catalyst ◽  
Macroporous Structure

Zeolite Y nanosheets with a micro–meso–macroporous structure were synthesized, and applied in the assembly of a Pd catalyst (Pd/NS-Y) for direct vinylation of thiophenes with high activity and selectivity, as compared to Pd(OAc)2, Pd(NO3)2, and Pd(PPh3)4 catalysts.

Nanoporous PdCe bimetallic nanocubes with high catalytic activity towards ethanol electro-oxidation and the oxygen reduction reaction in alkaline media

2018 ◽  
Vol 6 (46) ◽  
pp. 23560-23568 ◽  
Author(s):  
Jiyun Chen ◽  
Yao Li ◽  
Nali Lu ◽  
Chunhuan Tian ◽  
Zhida Han ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
High Activity ◽  
Melt Spinning ◽  
Reduction Reaction ◽  
Alkaline Media ◽  
High Catalytic Activity ◽  
Simple Method ◽  
Electro Oxidation

In this work, we reported a simple method to fabricate nanoporous PdCe (NP-PdCe) nanocubes with high activity and good stability by melt spinning combined with chemical dealloying.

Gas–liquid interface-mediated room-temperature synthesis of “clean” PdNiP alloy nanoparticle networks with high catalytic activity for ethanol oxidation

2014 ◽  
Vol 50 (85) ◽  
pp. 12877-12879 ◽  
Author(s):  
Rongfang Wang ◽  
Yuanyuan Ma ◽  
Hui Wang ◽  
Julian Key ◽  
Shan Ji
Keyword(s):  
Catalytic Activity ◽  
High Activity ◽  
Room Temperature ◽  
Ethanol Oxidation ◽  
Interface Reaction ◽  
Liquid Interface ◽  
High Catalytic Activity ◽  
Temperature Synthesis ◽  
Room Temperature Synthesis

PdNiP alloy nanoparticle networks prepared via a gas–liquid interface reaction had markedly high activity and durability for ethanol oxidation.

scholarly journals New hydrogen-bonding organocatalysts: Chiral cyclophosphazanes and phosphorus amides as catalysts for asymmetric Michael additions

2014 ◽  
Vol 10 ◽  
pp. 224-236 ◽  
Author(s):  
Helge Klare ◽  
Jörg M Neudörfl ◽  
Bernd Goldfuss
Keyword(s):  
Hydrogen Bonding ◽  
Catalytic Activity ◽  
High Activity ◽  
Michael Addition ◽  
Bond Activation ◽  
High Catalytic Activity ◽  
Open Chain ◽  
High Hydrogen ◽  
Michael Additions ◽  
Asymmetric Michael Addition

Ten novel hydrogen-bonding catalysts based on open-chain PV-amides of BINOL and chinchona alkaloids as well as three catalysts based on rigid cis-PV-cyclodiphosphazane amides of N 1,N 1-dimethylcyclohexane-1,2-diamine have been developed. Employed in the asymmetric Michael addition of 2-hydroxynaphthoquinone to β-nitrostyrene, the open-chain 9-epi-aminochinchona-based phosphorus amides show a high catalytic activity with almost quantitative yields of up to 98% and enantiomeric excesses of up to 51%. The cyclodiphosphazane catalysts show the same high activity and give improved enantiomeric excesses of up to 75%, thus representing the first successful application of a cyclodiphosphazane in enantioselective organocatalysis. DFT computations reveal high hydrogen-bonding strengths of cyclodiphosphazane PV-amides compared to urea-based catalysts. Experimental results and computations on the enantiodetermining step with cis-cyclodiphosphazane 14a suggest a strong bidentate H-bond activation of the nitrostyrene substrate by the catalyst.

Novel synthesis of silver/reduced graphene oxide nanocomposite and its high catalytic activity towards hydrogenation of 4-nitrophenol

RSC Advances ◽  
2015 ◽  
Vol 5 (87) ◽  
pp. 70968-70971 ◽  
Author(s):  
Nannan Meng ◽  
Shujie Zhang ◽  
Yifeng Zhou ◽  
Wangyan Nie ◽  
Pengpeng Chen
Keyword(s):  
Graphene Oxide ◽  
Catalytic Activity ◽  
High Activity ◽  
Reduced Graphene Oxide ◽  
Catalytic Hydrogenation ◽  
High Catalytic Activity ◽  
Impregnation Process ◽  
Novel Synthesis ◽  
Reduced Graphene

Ag/RGO nanocomposites were prepared via reducing AgNO3 in a macroscopic RGO aerogel directly through a convenient impregnation process, which exhibited high activity in the catalytic hydrogenation of 4-nitrophenol.

COBALT OXIDE DECORATED FLOWER-LIKE g-C3N4 HYBRID NANOMATERIALS FOR CARBON MONOXIDE OXIDATION

2016 ◽  
Vol 24 (05) ◽  
pp. 1750058 ◽  
Author(s):  
YAN WANG ◽  
JING HUANG ◽  
JIANLIANG CAO ◽  
GAOJIE LI ◽  
ZHANYING ZHANG
Keyword(s):  
Carbon Monoxide ◽  
Catalytic Activity ◽  
Co Oxidation ◽  
Hydrothermal Method ◽  
Cobalt Oxide ◽  
Reaction Temperature ◽  
High Catalytic Activity ◽  
Total Conversion ◽  
Ft Ir ◽  
Excellent Stability

Co3O4 decorated flower-like g-C3N4 hybrid nanocatalysts were successfully synthesized and prepared via a facial hydrothermal method. The composition and morphology of the as-synthesized Co3O4/g-C3N4 nanocatalysts were characterized by the techniques of XRD, FT-IR, SEM, TEM, XPS and N2-sorption. The analysis results indicated that the as-synthesized samples possess the flower-like structure, which consisted of g-C3N4 nanosheets and Co3O4 nanoparticles with the size about 25[Formula: see text]nm. The as-prepared Co3O4/g-C3N4 catalysts possess high catalytic activity and excellent stability for carbon monoxide (CO) oxidation. The total conversion of Co can be kept for more than 48[Formula: see text]h under the reaction temperature of 120[Formula: see text]C.

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>

Sign in / Sign up

Export Citation Format

Share Document