scholarly journals Seed-assisted synthesis of TS-1 crystals containing Al with high catalytic performances in cyclohexanone ammoximation

RSC Advances ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 2386-2394 ◽  
Author(s):  
Yan Xue ◽  
Guangling Zuo ◽  
Yiqiang Wen ◽  
Huijuan Wei ◽  
Meng Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Acid Sites ◽  
Cyclohexanone Ammoximation ◽  
Catalytic Performances

Using aluminosilicate zeolites seeds, Al atoms are introduced into the TS-1 crystals, resulting in high Lbvalue and more acid sites, which improve the catalytic activity in cyclohexanone ammoximation.

Hollow TS-1 mesocrystals: hydrothermal construction and high catalytic performances in cyclohexanone ammoximation

RSC Advances ◽  
2015 ◽  
Vol 5 (64) ◽  
pp. 51563-51569 ◽  
Author(s):  
Yan Xue ◽  
Yiqiang Wen ◽  
Huijuan Wei ◽  
Meng Liu ◽  
Xiaoyan Huang ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Hydrothermal Treatment ◽  
Cyclohexanone Ammoximation ◽  
Catalytic Performances

Hollow TS-1 mesocrystals were obtained by the hydrothermal treatment. The hollow mesocrystalline structure significantly affects their catalytic activity in cyclohexanone ammoximation.

Effect of surface acidity on the catalytic activity and deactivation of supported sulfonic acids during dehydration of methanol to DME

2020 ◽  
Vol 44 (39) ◽  
pp. 16810-16820
Author(s):  
Rosanna Viscardi ◽  
Vincenzo Barbarossa ◽  
Daniele Mirabile Gattia ◽  
Raimondo Maggi ◽  
Giovanni Maestri ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Sulfonic Acid ◽  
Water Resistance ◽  
Surface Acidity ◽  
Acid Catalyst ◽  
Acid Sites ◽  
Sulfonic Acids ◽  
Effect Of Surface

Superiorty of the supported sulfonic acid catalyst in terms of the water resistance and efficiency of the acid sites compared to the commercial reference.

Strength, Type and Catalytic Activity of Acid Sites in ZSM5 Zeolites

1985 ◽  
Vol 146 (1) ◽  
pp. 113-128 ◽  
Author(s):  
Johannes A. Lercher ◽  
Gerd Rumplmayr
Keyword(s):  
Catalytic Activity ◽  
Acid Sites

scholarly journals Effect of support acidity during selective hydrogenolysis of glycerol over supported palladium–ruthenium catalysts

2020 ◽  
Vol 378 (2176) ◽  
pp. 20200055
Author(s):  
Susana Guadix-Montero ◽  
Alba Santos-Hernandez ◽  
Andrea Folli ◽  
Meenakshisundaram Sankar
Keyword(s):  
Catalytic Activity ◽  
Supported Catalysts ◽  
Bond Cleavage ◽  
Strong Acid ◽  
Acid Sites ◽  
Ruthenium Catalysts ◽  
Impregnation Method ◽  
Selective Hydrogenolysis ◽  
Strong Acid Sites ◽  
Effect Of Support

We report the role of the acidity of support during the selectivity hydrogenolysis of glycerol over supported bimetallic palladium–ruthenium (PdRu) catalysts. The PdRu nanoparticles were supported on a series of metal oxides and zeolitic supports via the modified impregnation method and tested for the liquid-phase hydrogenolysis of glycerol using gaseous hydrogen. The relative acid site densities of selected catalysts were determined by ammonia temperature-programmed desorption and pyridine desorption experiments. Based on these studies, we report a direct correlation between the catalytic activity (conversion and 1,2 propane diol yield) and two different acid sites (strong acid sites and very strong acid sites). Besides zeolite-supported catalysts, TiO 2 supported PdRu nanoparticles exhibit moderate catalytic activity; however, this catalyst shows high selectivity for the desired C–O bond cleavage to produce C3 products over the undesired C–C bond cleavage to produce < C3 products. This article is part of a discussion meeting issue ‘Science to enable the circular economy’.

scholarly journals Evaluation of a Catalyst Durability in Absence and Presence of Toluene Impurity: Case of the Material Co2Ni2Mg2Al2 Mixed Oxide Prepared by Hydrotalcite Route in Methane Dry Reforming to Produce Energy

Materials ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1362
Author(s):  
Carole Tanios ◽  
Cédric Gennequin ◽  
Madona Labaki ◽  
Haingomalala Lucette Tidahy ◽  
Antoine Aboukaïs ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Mixed Oxide ◽  
Active Sites ◽  
Dry Reforming ◽  
Dry Reforming Of Methane ◽  
Side Reactions ◽  
Commercial Catalyst ◽  
Catalytic Sites ◽  
Catalyst Durability ◽  
Catalytic Performances

Ni, Co, Mg, and Al mixed-oxide solids, synthesized via the hydrotalcite route, were investigated in previous works toward the dry reforming of methane for hydrogen production. The oxide Co2Ni2Mg2Al2 calcined at 800 °C, Co2Ni2Mg2Al2800, showed the highest catalytic activity in the studied series, which was ascribable to an interaction between Ni and Co, which is optimal for this Co/Ni ratio. In the present study, Co2Ni2Mg2Al2800 was compared to a commercial catalyst widely used in the industry, Ni(50%)/Al2O3, and showed better activity despite its lower number of active sites, as well as lower amounts of carbon on its surface, i.e. less deactivation. In addition to this, Co2Ni2Mg2Al2800 showed stability for 20 h under stream during the dry reforming of methane. This good durability is attributed to a periodic cycle of carbon deposition and removal as well as to the strong interaction between Ni and Co, preventing the deactivation of the catalyst. The evaluation of the catalytic performances in the presence of toluene, which is an impurity that exists in biogas, is also a part of this work. In the presence of toluene, the catalytic activity of Co2Ni2Mg2Al2800 decreases, and higher carbon formation on the catalyst surface is detected. Toluene adsorption on catalytic sites, side reactions performed by toluene, and the competition between toluene and methane in the reaction with carbon dioxide are the main reasons for such results.

Catalytic dehydrofluorination of 1,1,1,2-tetrafluoroethane to synthesize trifluoroethylene over a modified NiO/Al2O3 catalyst

2015 ◽  
Vol 5 (6) ◽  
pp. 3103-3107 ◽  
Author(s):  
Wenzhi Jia ◽  
Min Liu ◽  
Xuewei Lang ◽  
Chao Hu ◽  
Junhui Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Linear Relationship ◽  
Lewis Acid ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Al2o3 Catalyst

The close linear relationship between Lewis acid sites and catalytic activity for the dehydrofluorination of CF3CFH2.

Morphology-dependent catalytic activity of plasmonic MoO3−x for hydrolytic dehydrogenation of ammonia borane

2017 ◽  
Vol 10 (06) ◽  
pp. 1750079 ◽  
Author(s):  
Jie Gong ◽  
Zhixue Li ◽  
Ting Zhang ◽  
Runze Chen ◽  
Xiaoying Zheng ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Catalytic Activity ◽  
Solvothermal Method ◽  
Visible Region ◽  
Volume Ratio ◽  
Ammonia Borane ◽  
Distilled Water ◽  
Facile Solvothermal Method ◽  
Solvent Volume ◽  
Catalytic Performances

Series of plasmonic MoO[Formula: see text] particles have been prepared by a facile solvothermal method to produce hydrogen via hydrolytic dehydrogenation of ammonia borane. Interestingly, the as-prepared MoO[Formula: see text] particles present various morphologies, i.e. flower, schistose and nanorod by simply tuning the reaction temperature and solvent volume ratio of distilled water and acetic acid. More importantly, these MoO[Formula: see text] particles with different morphologies exhibit various catalytic performances of NH3BH3 under the irradiation of visible light. Particularly, the flower-like MoO[Formula: see text] microstructure possesses the best catalytic activity for hydrogen production probably owing to the relatively large surface area and strong LSPR in the visible region.

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