scholarly journals Effect of pretreatment atmosphere of WOx/SiO2 catalysts on metathesis of ethylene and 2-butene to propylene

RSC Advances ◽  
2018 ◽  
Vol 8 (21) ◽  
pp. 11693-11704 ◽  
Author(s):  
Krittidech Gayapan ◽  
Sirada Sripinun ◽  
Joongjai Panpranot ◽  
Piyasan Praserthdam ◽  
Suttichai Assabumrungrat
Keyword(s):  
Pretreatment Atmosphere

Effect of H2 pretreatment on the non-calcined and air-calcined WO3/SiO2 catalysts.

scholarly journals Supported Gold Nanoparticles as Catalysts in Peroxidative and Aerobic Oxidation of 1-Phenylethanol under Mild Conditions

Nanomaterials ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 151 ◽  
Author(s):  
Ekaterina Pakrieva ◽  
Ana P. C. Ribeiro ◽  
Ekaterina Kolobova ◽  
Luísa M. D. R. S. Martins ◽  
Sónia A. C. Carabineiro ◽  
...  
Keyword(s):  
Photoelectron Spectroscopy ◽  
Active Sites ◽  
Density Functional ◽  
Aerobic Oxidation ◽  
Reaction Conditions ◽  
Tert Butyl Hydroperoxide ◽  
Temperature Programmed ◽  
Pretreatment Atmosphere ◽  
Supported Gold Nanoparticles ◽  
Supported Gold

The efficiency of Au/TiO2 based catalysts in 1-phenylethanol oxidation was investigated. The role of support modifiers (La2O3 or CeO2), influence of gold loading (0.5% or 4%) and redox pretreatment atmosphere, catalyst recyclability, effect of oxidant: tert-butyl hydroperoxide (TBHP) or O2, as well as the optimization of experimental parameters of the reaction conditions in the oxidation of this alcohol were studied and compared with previous studies on 1-octanol oxidation. Samples were characterized by temperature-programmed oxygen desorption (O2-TPD) method. X-ray photoelectron spectroscopy (XPS) measurements were carried out for used catalysts to find out the reason for deactivation in 1-phenylethanol oxidation. The best catalytic characteristics were shown by catalysts modified with La2O3, regardless of the alcohol and the type of oxidant. When O2 was used, the catalysts with 0.5% Au, after oxidative pretreatment, showed the highest activity in both reactions. The most active catalysts in 1-phenylethanol oxidation with TBHP were those with 4% Au and the H2 treatment, while under the same reaction conditions, 0.5% Au and O2 treatment were beneficial in 1-octanol oxidation. Despite the different chemical nature of the substrates, it seems likely that Au+(Auδ+) act as the active sites in both oxidative reactions. Density functional theory (DFT) simulations confirmed that the gold cationic sites play an essential role in 1-phenylethanol adsorption.

Effect of pretreatment atmosphere on the activity and selectivity of Co/mesoHZSM-5 for Fischer–Tropsch synthesis

2016 ◽  
Vol 40 (5) ◽  
pp. 4167-4177 ◽  
Author(s):  
Xiaohui Sun ◽  
Sina Sartipi ◽  
Freek Kapteijn ◽  
Jorge Gascon
Keyword(s):  
Tropsch Synthesis ◽  
Fischer Tropsch ◽  
Fischer Tropsch Synthesis ◽  
Pretreatment Atmosphere ◽  
Co Dispersion

Co/mesoHZSM-5 pretreatment in different atmospheres changes FT activity and CH4 selectivity by affecting Co dispersion and reducibility.

Effect of Pretreatment Atmosphere on the Structure of the Co-ZrO2 Catalyst Prepared by Precipitation Method

2006 ◽  
Vol 22 (11) ◽  
pp. 1404-1408
Author(s):  
JIA Li-Tao ◽  
◽  
◽  
FANG Ke-Gong ◽  
CHEN Jian-Gang ◽  
...  
Keyword(s):  
Precipitation Method ◽  
Pretreatment Atmosphere

Effect of pretreatment atmosphere on CO oxidation over α-Mn2O3 supported gold catalysts

2009 ◽  
Vol 264 (2) ◽  
pp. 145-153 ◽  
Author(s):  
Lu-Cun Wang ◽  
Lin He ◽  
Yong-Mei Liu ◽  
Yong Cao ◽  
He-Yong He ◽  
...  
Keyword(s):  
Co Oxidation ◽  
Gold Catalysts ◽  
Supported Gold Catalysts ◽  
Pretreatment Atmosphere ◽  
Supported Gold

Biosynthesized Pd/γ-Al2O3 catalysts for low-temperature 1,3-butadiene hydrogenation: the effect of calcination atmosphere

2017 ◽  
Vol 41 (21) ◽  
pp. 13036-13042 ◽  
Author(s):  
Fenfen Lu ◽  
Yan Xu ◽  
Xia Jiang ◽  
Yang Liu ◽  
Jiale Huang ◽  
...  
Keyword(s):  
Low Temperature ◽  
Pretreatment Atmosphere ◽  
Calcination Atmosphere ◽  
Butadiene Hydrogenation

The effect of pretreatment atmosphere on 1,3-butadiene hydrogenation over biosynthesized Pd/γ-Al2O3 catalysts was reported.

Effect of Pretreatment Atmosphere on CuO/TiO2 Activities in NO + CO Reaction

2005 ◽  
Vol 104 (3-4) ◽  
pp. 169-175 ◽  
Author(s):  
Jiang Xiaoyuan ◽  
Jia Yanrong ◽  
Huang Pei Hua ◽  
Zheng Xiaoming
Keyword(s):  
Pretreatment Atmosphere
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