Catalytic activity of CrCo/alumina catalyst in thiophene hydrodesulphurisation

2000 ◽  
Vol 157 (1-2) ◽  
pp. 245-252
Author(s):  
Sari Myllyoja ◽  
Jarkko Räty ◽  
Tapani A Pakkanen
Keyword(s):  
Catalytic Activity ◽  
Alumina Catalyst

scholarly journals Effect of Calcination Temperatures and Mo Modification on Nanocrystalline (γ-χ)-Al2O3 Catalysts for Catalytic Ethanol Dehydration

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Tharmmanoon Inmanee ◽  
Piriya Pinthong ◽  
Bunjerd Jongsomjit
Keyword(s):  
Catalytic Activity ◽  
Strong Acid ◽  
Mixed Phase ◽  
Ethanol Conversion ◽  
Ethanol Dehydration ◽  
X Ray Diffraction ◽  
Alumina Catalyst ◽  
Calcination Temperatures ◽  
Transmission Electron ◽  
Temperature Programmed

The mixed gamma and chi crystalline phase alumina (M-Al) catalysts prepared by the solvothermal method were investigated for catalytic ethanol dehydration. The effects of calcination temperatures and Mo modification were elucidated. The catalysts were characterized by X-ray diffraction (XRD), N2 physisorption, transmission electron microscopy (TEM), and NH3-temperature programmed desorption (NH3-TPD). The catalytic activity was tested for ethylene production by dehydration reaction of ethanol in gas phase at atmospheric pressure and temperature between 200°C and 400°C. It was found that the calcination temperatures and Mo modification have effects on acidity of the catalysts. The increase in calcination temperature resulted in decreased acidity, while the Mo modification on the mixed phase alumina catalyst yielded increased acidity, especially in medium to strong acids. In this study, the catalytic activity of ethanol dehydration to ethylene apparently depends on the medium to strong acid. The mixed phase alumina catalyst calcined at 600°C (M-Al-600) exhibits the complete ethanol conversion having ethylene yield of 98.8% (at 350°C) and the Mo-modified catalysts promoted dehydrogenation reaction to acetaldehyde. This can be attributed to the enhancement of medium to strong acid with metal sites of catalyst.

Preparation of Ag nanoparticle loaded mesoporous γ-alumina catalyst and its catalytic activity for reduction of 4-nitrophenol

2012 ◽  
Vol 232 ◽  
pp. 1-6 ◽  
Author(s):  
Bhanudas Naik ◽  
Vadakkethonippurathu Sivankutty Prasad ◽  
Narendra Nath Ghosh
Keyword(s):  
Catalytic Activity ◽  
Ag Nanoparticle ◽  
Alumina Catalyst

Synthesis of macro-mesoporous Pt/alumina catalyst to enhance catalytic activity of hydrogen oxidation

2012 ◽  
Vol 8 (2) ◽  
pp. 225-230 ◽  
Author(s):  
Yo-Min Choi ◽  
Young-In Lee ◽  
Seil Kim ◽  
Nosang V. Myung ◽  
Yong-Ho Choa
Keyword(s):  
Catalytic Activity ◽  
Hydrogen Oxidation ◽  
Alumina Catalyst
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