scholarly journals High catalytic performance of Al–Pd–(Ru, Fe) icosahedral approximants for acetylene semi-hydrogenation

RSC Advances ◽  
2021 ◽  
Vol 11 (25) ◽  
pp. 15296-15300
Author(s):  
Keishi Abe ◽  
Ryota Tsukuda ◽  
Nobuhisa Fujita ◽  
Satoshi Kameoka
Keyword(s):  
Catalytic Performance ◽  
Ethylene Selectivity

The Al–Pd–(Ru, Fe) icosahedral approximants exhibited high catalytic ethylene selectivity and stability for semi-hydrogenation of acetylene.

scholarly journals Revisiting Oxidative Dehydrogenation of Ethane by W Doping into MoVMn Mixed Oxides at Low Temperature

2015 ◽  
Vol 2015 ◽  
pp. 1-9
Author(s):  
Mohammed H. Al-Hazmi ◽  
Taiwo Odedairo ◽  
Adel S. Al-Dossari ◽  
YongMan Choi
Keyword(s):  
Oxidative Dehydrogenation ◽  
Oxide Catalyst ◽  
Mixed Oxides ◽  
Catalytic Performance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Oxidative Dehydrogenation Of Ethane ◽  
Mixed Oxide Catalyst ◽  
Ethylene Selectivity ◽  
Temperature Programmed

The catalytic performance of MoVMnW mixed oxides was investigated in the oxidative dehydrogenation of ethane at three different reaction temperatures (235, 255, and 275°C) using oxygen as an oxidant. The catalysts were characterized by using X-ray diffraction, temperature-programmed reduction, and scanning electron microscopy. The MoVMnW mixed oxide catalyst showed the 70–90% of ethylene selectivity at the reaction temperatures. However, a significant decrease in the selectivity of ethylene was observed by increasing the reaction temperature from 235°C to 275°C.

scholarly journals The Effect of Shape-Controlled Pt and Pd Nanoparticles on Selective Catalytic Hydrodechlorination of Trichloroethylene

Catalysts ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1314
Author(s):  
Oğuz Yunus Sarıbıyık ◽  
Christian Weilach ◽  
Selahattin Serin ◽  
Günther Rupprechter
Keyword(s):  
Morphological Characteristics ◽  
Pd Nanoparticles ◽  
Catalytic Performance ◽  
X Ray Diffraction ◽  
Catalytic Hydrodechlorination ◽  
Nanoparticle Shape ◽  
Transmission Electron ◽  
Shape Controlled ◽  
Ethylene Selectivity ◽  
Distinct Morphology

Tailoring the shape of nanoscale materials enables obtaining morphology-controlled surfaces exhibiting specific interactions with reactants during catalytic reactions. The specifics of nanoparticle surfaces control the catalytic performance, i.e., activity and selectivity. In this study, shape-controlled Platinum (Pt) and Palladium (Pd) nanoparticles with distinct morphology were produced, i.e., cubes and cuboctahedra for Pt and spheres and polyhedra/multiple-twins for Pd, with (100), (111 + 100), curved/stepped and (111) facets, respectively. These particles with well-tuned surfaces were subsequently deposited on a Zirconium oxide (ZrO2) support. The morphological characteristics of the particles were determined by high resolution transmission electron microscopy (HR-TEM) and X-ray diffraction (XRD), while their adsorption properties were investigated by Fourier transform infrared spectroscopy (FTIR) of CO adsorbed at room temperature. The effect of the nanoparticle shape and surface structure on the catalytic performance in hydrodechlorination (HDCl) of trichloroethylene (TCE) was examined. The results show that nanoparticles with different surface orientations can be employed to affect selectivity, with polyhedral and multiply-twinned Pd exhibiting the best ethylene selectivity.

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.

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.

Fabrication and Excellent Catalytic Performance of Three-dimensional Ordered Mesoporous Molybdenum Oxides

2014 ◽  
Vol 29 (2) ◽  
pp. 124-130 ◽  
Author(s):  
Yu-Cheng DU ◽  
Guang-Wei ZHENG ◽  
Qi MENG ◽  
Li-Ping WANG ◽  
Hai-Guang FAN ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Catalytic Performance ◽  
Molybdenum Oxides ◽  
Ordered Mesoporous ◽  
Excellent Catalytic Performance

Preparation of CeO2-ZrO2-Al2O3 and Catalytic Performance of Palladium-Based Three-Way Catalyst

2010 ◽  
Vol 31 (4) ◽  
pp. 429-434
Author(s):  
Ming ZHAO ◽  
Hairong WANG ◽  
Shanhu CHEN ◽  
Yanling YAO ◽  
Maochu GONG ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Three Way Catalyst

Effect of Supports on Catalytic Performance of Nickel-Based Catalyst for Methanation

2014 ◽  
Vol 32 (8) ◽  
pp. 1400-1404
Author(s):  
Xia LI ◽  
Xiazhen YANG ◽  
Haodong TANG ◽  
Huazhang LIU
Keyword(s):  
Catalytic Performance

Preparation of Cu-Mn/Zr-Ce-SBA-15 Catalyst with Short Mesochannels and Its Catalytic Performance for Toluene Combustion

2014 ◽  
Vol 32 (6) ◽  
pp. 1069-1075
Author(s):  
Jinfang YUAN ◽  
Jiansheng LI ◽  
Fang WANG ◽  
Xiuyun SUN ◽  
Jinyou SHEN ◽  
...  
Keyword(s):  
Catalytic Performance
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