Maximizing the Catalytic Performance of Pd@AuxPd1‐x Nanocubes in H2O2 Production by Reducing Shell Thickness to Increase Compositional Stability

2021 ◽  
Author(s):  
Younan Xia ◽  
Yu Zhang ◽  
Zhiheng Lyu ◽  
Zitao Chen ◽  
Shangqian Zhu ◽  
...  
Keyword(s):  
Shell Thickness ◽  
Catalytic Performance ◽  
H2o2 Production ◽  
Compositional Stability

Shell thickness controlled core–shell Fe3O4@CoO nanocrystals as efficient bifunctional catalysts for the oxygen reduction and evolution reactions

2019 ◽  
Vol 55 (4) ◽  
pp. 525-528 ◽  
Author(s):  
Lingshan Zhou ◽  
Binglu Deng ◽  
Zhongqing Jiang ◽  
Zhong-Jie Jiang
Keyword(s):  
Oxygen Reduction ◽  
Shell Thickness ◽  
Great Influence ◽  
Catalytic Performance ◽  
Core Shell ◽  
Bifunctional Catalysts ◽  
Catalytic Activities

Core–shell Fe3O4@CoO NCs have been demonstrated to be efficient catalysts for ORR and OER. The specific core/shell interaction can be ascribed to the main reason leading to their high catalytic performance. The shell thickness has a great influence on the catalytic activities.

scholarly journals Pd@Zn core–shell nanoparticles of controllable shell thickness for catalytic methanol production

2016 ◽  
Vol 6 (21) ◽  
pp. 7698-7702 ◽  
Author(s):  
Fenglin Liao ◽  
Xin-Ping Wu ◽  
Jianwei Zheng ◽  
Meng-Jung Li ◽  
Ziyan Zeng ◽  
...  
Keyword(s):  
Shell Thickness ◽  
Synthesis Method ◽  
Catalytic Performance ◽  
Shell Structures ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
Methanol Production ◽  
Novel Synthesis ◽  
Core Shell Nanoparticles

A novel synthesis method of nano-Pd@Zn core–shell structures with controllable shell thickness showing remarkable catalytic performance in CO2hydrogenation.

scholarly journals The influence of the MOF shell thickness on the catalytic performance of composites made of inorganic (hollow) nanoparticles encapsulated into MOFs

2016 ◽  
Vol 6 (24) ◽  
pp. 8388-8391 ◽  
Author(s):  
A. Yazdi ◽  
F. Mercoçi ◽  
N. G. Bastús ◽  
I. Imaz ◽  
V. Puntes ◽  
...  
Keyword(s):  
Shell Thickness ◽  
Pd Nanoparticles ◽  
Catalytic Performance ◽  
Hollow Nanoparticles

A series of ZIF-8 composites containing hollow Pt or Pd nanoparticles show that the size and the MOF shell thickness play a key role in the catalytic performance of this class of composites.

scholarly journals The Selective Oxidation of Cyclohexane via In-situ H2O2 Production Over Supported Pd-based Catalysts

2021 ◽  
Author(s):  
Caitlin M. Crombie ◽  
Richard J. Lewis ◽  
Dávid Kovačič ◽  
David J. Morgan ◽  
Thomas J. A. Slater ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Catalytic Performance ◽  
Environmental Concerns ◽  
H2o2 Production ◽  
X Ray ◽  
Mixed Oxidation ◽  
Order Of Magnitude ◽  
Oil Concentration ◽  
Supported Pd

AbstractThe oxidation of cyclohexane via the in-situ production of H2O2 from molecular H2 and O2 offers an attractive route to the current industrial means of producing cyclohexanone and cyclohexanol (KA oil), key materials in the production of Nylon. The in-situ route has the potential to overcome the significant economic and environmental concerns associated with the use of commercial H2O2, while also allowing for the use of far lower reaction temperatures than those typical of the purely aerobic route to KA oil. Herein we demonstrate the efficacy of a series of bi-functional Pd-based catalysts, which offer appreciable concentrations of KA oil, under conditions where limited activity is observed using O2 alone. In particular the introduction of V into a supported Pd catalyst is seen to improve KA oil concentration by an order of magnitude, compared to the Pd-only analogue. In particular we ascribe this improvement in catalytic performance to the development of Pd domains of mixed oxidation state upon V incorporation as evidenced through X-ray photoelectron spectroscopy. Graphic Abstract

The design and catalytic performance of molybdenum active sites on an MCM-41 framework for the aerobic oxidation of 5-hydroxymethylfurfural to 2,5-diformylfuran

2019 ◽  
Vol 9 (3) ◽  
pp. 811-821 ◽  
Author(s):  
Zhao-Meng Wang ◽  
Li-Juan Liu ◽  
Bo Xiang ◽  
Yue Wang ◽  
Ya-Jing Lyu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Active Sites ◽  
Aerobic Oxidation ◽  
Catalytic Performance ◽  
Mcm 41

The catalytic activity decreases as –(SiO)3Mo(OH)(O) > –(SiO)2Mo(O)2 > –(O)4–MoO.

Optimizing electron density of nickel sulfide electrocatalysts through sulfur vacancy engineering for alkaline hydrogen evolution

2020 ◽  
Vol 8 (35) ◽  
pp. 18207-18214
Author(s):  
Dongbo Jia ◽  
Lili Han ◽  
Ying Li ◽  
Wenjun He ◽  
Caichi Liu ◽  
...  
Keyword(s):  
Hydrogen Evolution ◽  
Electron Density ◽  
Rational Design ◽  
Nickel Sulfide ◽  
Catalytic Performance ◽  
Sulfide Catalysts ◽  
Sulfur Vacancy

A novel, rational design for porous S-vacancy nickel sulfide catalysts with remarkable catalytic performance for alkaline HER.

Japon Bıldırcını Rasyonlarında Soya Küspesi Yerine Pamuk Tohumu Küspesi İkamesinin Yumurta Verim ve Kalite Özelliklerine Etkisi

2013 ◽  
Vol 1 (1) ◽  
pp. 44 ◽  
Author(s):  
Arda Yıldırım ◽  
Ergin Öztürk
Keyword(s):  
Protein Content ◽  
Cottonseed Meal ◽  
Soybean Meal ◽  
Shell Thickness ◽  
Egg Production ◽  
Egg Quality ◽  
Yield Traits

This study was conducted to determine the effect of cottonseed meal (CSM) incorporated into laying rations in place of soybean meal (SBM) at different ratios on yield traits. The birds began to lay at 6th week, 180 female and 45 male quails were used in laying period experiment. Birds were fed with rations containing 20% CP and 3000 Kcal/kg ME up to 20-week age (Laying period). CSM as a substitute, five different rations of the protein content (0, 30, 58, 86 and 100%) for SBM to basal diets based on corn-soybean meal were used. The results showed that there were no differences in terms of egg yield traits, cumulative feed consumptions and viabilities during the laying period. The highest dry shell rate and shell thickness were obtained from 5th group and 1st group, respectively. As a result, adding CSM instead of SBM in laying period were no significantly differences in terms of egg production and egg quality in laying period.

Catalytic Resonance Theory: Parallel Reaction Pathway Control

2019 ◽  
Author(s):  
M. Alexander Ardagh ◽  
Manish Shetty ◽  
Anatoliy Kuznetsov ◽  
Qi Zhang ◽  
Phillip Christopher ◽  
...  
Keyword(s):  
Chemical Reactions ◽  
Active Site ◽  
Active Sites ◽  
Reaction Pathway ◽  
Control Strategies ◽  
Oscillation Amplitude ◽  
Catalytic Performance ◽  
Parallel Reaction ◽  
Resonance Theory ◽  
Static Conditions

Catalytic enhancement of chemical reactions via heterogeneous materials occurs through stabilization of transition states at designed active sites, but dramatically greater rate acceleration on that same active site is achieved when the surface intermediates oscillate in binding energy. The applied oscillation amplitude and frequency can accelerate reactions orders of magnitude above the catalytic rates of static systems, provided the active site dynamics are tuned to the natural frequencies of the surface chemistry. In this work, differences in the characteristics of parallel reactions are exploited via selective application of active site dynamics (0 < ΔU < 1.0 eV amplitude, 10<sup>-6</sup> < f < 10<sup>4</sup> Hz frequency) to control the extent of competing reactions occurring on the shared catalytic surface. Simulation of multiple parallel reaction systems with broad range of variation in chemical parameters revealed that parallel chemistries are highly tunable in selectivity between either pure product, even when specific products are not selectively produced under static conditions. Two mechanisms leading to dynamic selectivity control were identified: (i) surface thermodynamic control of one product species under strong binding conditions, or (ii) catalytic resonance of the kinetics of one reaction over the other. These dynamic parallel pathway control strategies applied to a host of chemical conditions indicate significant potential for improving the catalytic performance of many important industrial chemical reactions beyond their existing static performance.

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