scholarly journals Hydrothermal Synthesis of Lanthanide Stannates Pyrochlore Nanocrystals for Catalytic Combustion of Soot Particulates

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Xiaomin Zhang ◽  
Xuhui Liu ◽  
Peng Lu ◽  
Liguo Wang ◽  
Zhaoliang Zhang ◽  
...  
Keyword(s):  
Surface Area ◽  
Catalytic Combustion ◽  
High Surface ◽  
High Surface Area ◽  
Pyrochlore Structure ◽  
Soot Combustion ◽  
Hydrothermal Route ◽  
Spherical Structure ◽  
Surface Oxygen Vacancy ◽  
Gas Molecule

Nanocrystalline La2Sn2O7and La2Sn1.8Co0.2O7with a phase-pure pyrochlore structure were synthesized by a hydrothermal method, and their catalytic activity was investigated for soot combustion. The as-synthesized catalysts presented relatively larger surface area, and pore volume, which was benefit to the gas molecule diffusion in the reaction. A uniform spherical structure with particle size of 200–500 nm was found in SEM. The samples via hydrothermal route are more active for catalytic soot combustion, ascribing to the spherical morphology, high surface area and improved oxygen mobility. After Co, the reducibility was improved and surface oxygen vacancy was produced, resulting in the enhanced activity and selectivity to CO2formation.

Facile Fabrication of Single Crystalline Ceria Nanoparticles for Photo-Responsive Applications

2012 ◽  
Vol 734 ◽  
pp. 127-137
Author(s):  
D.P. Das ◽  
Armita Dash ◽  
B.K. Mishra
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Band Gap Energy ◽  
Ceria Nanoparticles ◽  
Processing Conditions ◽  
Hydrothermal Route ◽  
Single Crystalline ◽  
Nanocrystallite Size ◽  
Facile Fabrication

The present investigation is about fabrication of single-crystalline ceria (CeO2) nanoparticle by a hydrothermal route. High surface area CeO2 was synthesized with transformation of morphology from nanofibers to nanocubes in response to processing conditions. A steady variation of average nanocrystallite size ca. in the range 3.0-16.9 nm and a range of band gap energy from 2.6 to 2.9 eV were measured. The surface area of the nanoparticles varied in the range 16.0136.1 m2/g and the variation in surface area is attributed to the nature of packing of particles. The ceria nanofibers could generate 870.5 µmol of H2 in 3 h of irradiation.

Novel core–shell structured BiVO4 hollow spheres with an ultra-high surface area as visible-light-driven catalyst

CrystEngComm ◽  
2014 ◽  
Vol 16 (27) ◽  
pp. 6059-6065 ◽  
Author(s):  
Yang Lu ◽  
Yong-Song Luo ◽  
Hong-Mei Xiao ◽  
Shao-Yun Fu
Keyword(s):  
Photocatalytic Activity ◽  
Visible Light ◽  
Surface Area ◽  
High Surface ◽  
Hollow Spheres ◽  
High Surface Area ◽  
Core Shell ◽  
Hydrothermal Route ◽  
Excellent Photocatalytic Activity ◽  
Visible Light Driven

Novel core–shell-structured BiVO4 hollow spheres synthesized via a simple hydrothermal route exhibit an excellent photocatalytic activity.

Promoting the activity and selectivity of high surface area Ni–Ce–O mixed oxides by gold deposition for VOC catalytic combustion

2011 ◽  
Vol 175 ◽  
pp. 271-278 ◽  
Author(s):  
Benjamín Solsona ◽  
Tomás Garcia ◽  
Elvira Aylón ◽  
Ana M. Dejoz ◽  
Isabel Vázquez ◽  
...  
Keyword(s):  
Surface Area ◽  
Catalytic Combustion ◽  
Mixed Oxides ◽  
High Surface ◽  
High Surface Area ◽  
Gold Deposition

A two-step synthesis of Fe-substituted hexaaluminates with enhanced surface area and activity in methane catalytic combustion

2016 ◽  
Vol 6 (13) ◽  
pp. 4962-4969 ◽  
Author(s):  
Fei Huang ◽  
Xiaodong Wang ◽  
Aiqin Wang ◽  
Jinming Xu ◽  
Tao Zhang
Keyword(s):  
High Activity ◽  
Surface Area ◽  
Catalytic Combustion ◽  
High Surface ◽  
High Surface Area ◽  
Step Method ◽  
Methane Catalytic Combustion ◽  
Enhanced Surface

High-surface-area Fe-substituted hexaaluminates prepared by a new two-step method exhibited high activity for methane catalytic combustion.

Tenacious Mass Transfer Limitations Drive Catalytic Selectivity during Electrochemical Carbon Dioxide Reduction

2019 ◽  
Author(s):  
Kailun Yang ◽  
Recep Kas ◽  
Wilson A. Smith
Keyword(s):  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Catalyst Layer ◽  
Active Surface ◽  
Active Surface Area ◽  
High Concentration ◽  
Copper Electrodes ◽  
Surface Enhanced ◽  
Local Current

<p>This study evaluated the performance of the commonly used strong buffer electrolytes, i.e. phosphate buffers, during CO<sub>2</sub> electroreduction in neutral pH conditions by using in-situ surface enhanced infrared absorption spectroscopy (SEIRAS). Unfortunately, the buffers break down a lot faster than anticipated which has serious implications on many studies in the literature such as selectivity and kinetic analysis of the electrocatalysts. Increasing electrolyte concentration, surprisingly, did not extend the potential window of the phosphate buffers due to dramatic increase in hydrogen evolution reaction. Even high concentration phosphate buffers (1 M) break down within the potentials (-1 V vs RHE) where hydrocarbons are formed on copper electrodes. We have extended the discussion to high surface area electrodes by evaluating electrodes composed of copper nanowires. We would like highlight that it is not possible to cope with high local current densities on these high surface area electrodes by using high buffer capacity solutions and the CO<sub>2</sub> electrocatalysts are needed to be evaluated by casting thin nanoparticle films onto inert substrates as commonly employed in fuel cell reactions and up to now scarcely employed in CO<sub>2</sub> electroreduction. In addition, we underscore that normalization of the electrocatalytic activity to the electrochemical active surface area is not the ultimate solution due to concentration gradient along the catalyst layer.This will “underestimate” the activity of high surface electrocatalyst and the degree of underestimation will depend on the thickness, porosity and morphology of the catalyst layer. </p> <p> </p>

scholarly journals Rugae-like FeP nanocrystal assembly on a carbon cloth: an exceptionally efficient and stable cathode for hydrogen evolution

Nanoscale ◽  
2015 ◽  
Vol 7 (25) ◽  
pp. 10974-10981 ◽  
Author(s):  
Xiulin Yang ◽  
Ang-Yu Lu ◽  
Yihan Zhu ◽  
Shixiong Min ◽  
Mohamed Nejib Hedhili ◽  
...  
Keyword(s):  
Gas Phase ◽  
Surface Area ◽  
Hydrogen Evolution ◽  
Hydrogen Generation ◽  
High Surface ◽  
High Surface Area ◽  
Catalytic Efficiency ◽  
Carbon Cloth ◽  
Nanocrystal Assembly

High surface area FeP nanosheets on a carbon cloth were prepared by gas phase phosphidation of electroplated FeOOH, which exhibit exceptionally high catalytic efficiency and stability for hydrogen generation.

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