Insights into the reaction mechanism of n-hexane dehydroaromatization to benzene over gallium embedded HZSM-5: effect of H2 incorporated on active sites

2019 ◽  
Vol 21 (10) ◽  
pp. 5359-5367 ◽  
Author(s):  
Anawat Thivasasith ◽  
Thana Maihom ◽  
Sitthiphong Pengpanich ◽  
Jumras Limtrakul ◽  
Chularat Wattanakit
Keyword(s):  
Reaction Mechanism ◽  
Active Sites ◽  
Active Species ◽  
Gallium Complex

This work clearly confirms the existence of dihydrido gallium complex (GaH2+) as one of the most active species for the n-hexane dehydroaromatization into benzene.

scholarly journals Morphological and Elemental Investigations on Co–Fe–B–O Thin Films Deposited by Pulsed Laser Deposition for Alkaline Water Oxidation: Charge Exchange Efficiency as the Prevailing Factor in Comparison with the Adsorption Process

2021 ◽  
Author(s):  
Y. Popat ◽  
M. Orlandi ◽  
S. Gupta ◽  
N. Bazzanella ◽  
S. Pillai ◽  
...  
Keyword(s):  
Pulsed Laser Deposition ◽  
Water Oxidation ◽  
Active Sites ◽  
High Surface ◽  
Pulsed Laser ◽  
Industrial Applications ◽  
Active Species ◽  
Laser Deposition ◽  
Core Shell ◽  
Adsorption Sites

Abstract Mixed transition-metals oxide electrocatalysts have shown huge potential for electrochemical water oxidation due to their earth abundance, low cost and excellent electrocatalytic activity. Here we present Co–Fe–B–O coatings as oxygen evolution catalyst synthesized by Pulsed Laser Deposition (PLD) which provided flexibility to investigate the effect of morphology and structural transformation on the catalytic activity. As an unusual behaviour, nanomorphology of 3D-urchin-like particles assembled with crystallized CoFe2O4 nanowires, acquiring high surface area, displayed inferior performance as compared to core–shell particles with partially crystalline shell containing boron. The best electrochemical activity towards water oxidation in alkaline medium with an overpotential of 315 mV at 10 mA/cm2 along with a Tafel slope of 31.5 mV/dec was recorded with core–shell particle morphology. Systematic comparison with control samples highlighted the role of all the elements, with Co being the active element, boron prevents the complete oxidation of Co to form Co3+ active species (CoOOH), while Fe assists in reducing Co3+ to Co2+ so that these species are regenerated in the successive cycles. Thorough observation of results also indicates that the activity of the active sites play a dominating role in determining the performance of the electrocatalyst over the number of adsorption sites. The synthesized Co–Fe–B–O coatings displayed good stability and recyclability thereby showcasing potential for industrial applications. Graphic Abstract

Selective hydrogenation of nitroarenes under mild conditions by the optimization of active sites in a well defined Co@NC catalyst

2020 ◽  
Vol 22 (17) ◽  
pp. 5730-5741
Author(s):  
Shuo Chen ◽  
Li-Li Ling ◽  
Shun-Feng Jiang ◽  
Hong Jiang
Keyword(s):  
Particle Size ◽  
Catalytic Hydrogenation ◽  
Selective Hydrogenation ◽  
Active Sites ◽  
Metal Organic Framework ◽  
Nitro Compounds ◽  
Active Species ◽  
Mild Conditions ◽  
Metal Organic ◽  
Aromatic Nitro

The defined catalyst (Co@NC) is prepared through the pyrolysis of the Co-centered metal–organic framework (MOF), in which Co active species (Co–Nx, surface Co NPs) and particle size play important roles in the catalytic hydrogenation of aromatic nitro compounds.

Solid-state NMR for metal-containing zeolites: From active sites to reaction mechanism

2020 ◽  
Vol 14 (2) ◽  
pp. 159-187 ◽  
Author(s):  
Xingling Zhao ◽  
Jun Xu ◽  
Feng Deng
Keyword(s):  
Reaction Mechanism ◽  
Solid State ◽  
Solid State Nmr ◽  
Active Sites

Influence of preparation methods on iron-tungsten composite catalyst for NH3-SCR of NO: The active sites and reaction mechanism

2020 ◽  
Vol 503 ◽  
pp. 144190 ◽  
Author(s):  
Qiulin Zhang ◽  
Yaqing Zhang ◽  
Tengxiang Zhang ◽  
Huimin Wang ◽  
YanPing Ma ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Active Sites ◽  
Composite Catalyst ◽  
Preparation Methods ◽  
Nh3 Scr ◽  
Scr Of No

Identification of active sites and reaction mechanism on low-temperature SCR activity over Cu-SSZ-13 catalysts prepared by different methods

2016 ◽  
Vol 6 (16) ◽  
pp. 6294-6304 ◽  
Author(s):  
Tao Zhang ◽  
Feng Qiu ◽  
Huazhen Chang ◽  
Xiang Li ◽  
Junhua Li
Keyword(s):  
Aqueous Solution ◽  
Reaction Mechanism ◽  
Low Temperature ◽  
Ion Exchange ◽  
Active Sites ◽  
One Pot ◽  
One Pot Synthesis ◽  
Low Temperature Scr

Cu-SSZ-13 catalysts with similar Si/Al and Cu/Al ratios were prepared by aqueous solution ion-exchange (Cu-SSZ-13-I) and one-pot synthesis (Cu-SSZ-13-O) methods.

Room temperature oxidation of active sites in coal under multi-factor conditions and corresponding reaction mechanism

Fuel ◽  
2019 ◽  
Vol 256 ◽  
pp. 115901 ◽  
Author(s):  
Jinhu Li ◽  
Zenghua Li ◽  
Yongliang Yang ◽  
Junhao Niu ◽  
Qingxia Meng
Keyword(s):  
Reaction Mechanism ◽  
Active Sites ◽  
Room Temperature ◽  
Temperature Oxidation

scholarly journals Titelbild: Quantification of Active Sites and Elucidation of the Reaction Mechanism of the Electrochemical Nitrogen Reduction Reaction on Vanadium Nitride (Angew. Chem. 39/2019)

2019 ◽  
Vol 131 (39) ◽  
pp. 13733-13733
Author(s):  
Xuan Yang ◽  
Shyam Kattel ◽  
Jared Nash ◽  
Xiaoxia Chang ◽  
Ji Hoon Lee ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Active Sites ◽  
Reduction Reaction ◽  
Vanadium Nitride ◽  
Nitrogen Reduction

Silver-alumina catalysts for selective reduction of NO by higher hydrocarbons: structure of active sites and reaction mechanism

2001 ◽  
Vol 30 (1-2) ◽  
pp. 151-162 ◽  
Author(s):  
Ken-ichi Shimizu ◽  
Junji Shibata ◽  
Hisao Yoshida ◽  
Atsushi Satsuma ◽  
Tadashi Hattori
Keyword(s):  
Reaction Mechanism ◽  
Active Sites ◽  
Selective Reduction ◽  
Reduction Of No ◽  
Higher Hydrocarbons ◽  
Alumina Catalysts
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