Effect of cerous phosphates with different crystal structures on their acidity and catalytic activity for the dehydration of glucose into 5-(hydroxymethyl)furfural

RSC Advances ◽  
2016 ◽  
Vol 6 (46) ◽  
pp. 40175-40184 ◽  
Author(s):  
Lina Wang ◽  
Fulong Yuan ◽  
Xiaoyu Niu ◽  
Chuanhong Kang ◽  
Pengying Li ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Crystal Structures ◽  
Hydroxymethyl Furfural ◽  
Catalytic Performances

Cerous phosphate catalysts with different crystal structures show different catalytic performances for the dehydration of glucose into 5-(hydroxymethyl)furfural due to their surface Ce4+ amounts and acidities.

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.

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.

Pd/Ag and Pd/Au bimetallic nanocatalysts on mesoporous silica for plasmon-mediated enhanced catalytic activity under visible light irradiation

2016 ◽  
Vol 4 (26) ◽  
pp. 10142-10150 ◽  
Author(s):  
Priyanka Verma ◽  
Yasutaka Kuwahara ◽  
Kohsuke Mori ◽  
Hiromi Yamashita
Keyword(s):  
Catalytic Activity ◽  
Mesoporous Silica ◽  
Visible Light ◽  
Visible Light Irradiation ◽  
Light Irradiation ◽  
Systematic Comparison ◽  
Bimetallic Nanostructures ◽  
Bimetallic Nanocatalysts ◽  
Catalytic Performances

A systematic comparison of plasmonic properties and catalytic performances has been performed with Pd deposited bimetallic nanostructures of plasmonic Ag and Au.

The Influence of Preparation Procedures on Hydrogenation CO2 to Formic Acid over Supported Ru Catalysts

2014 ◽  
Vol 881-883 ◽  
pp. 283-286 ◽  
Author(s):  
Na Liu ◽  
Jie Lei ◽  
Meng Yao Li ◽  
Peng Wang
Keyword(s):  
Catalytic Activity ◽  
Formic Acid ◽  
Ruthenium Oxide ◽  
Nitrogen Adsorption ◽  
Preparation Procedure ◽  
Ru Catalysts ◽  
Optimal Activity ◽  
Adsorption Measurement ◽  
Hydrogenation Of Co ◽  
Catalytic Performances

A series of catalysts made of ruthenium loaded on γ-Al2O3 nanorods were prepared to study the effects of preparation procedure on their catalytic performances for hydrogenation CO2 to formic acid. The catalysts are characterized by XRD, nitrogen adsorption measurement and H2-TPR in detail. The results reveal that the catalytic activity is determined by the structure of supported ruthenium oxide species. The dispersion of RuOx is influenced by the preparation procedures. Optimal activity of catalyst for the hydrogenation of CO2 to formic acid is achieved over a γ-Al2O3 nanorods supported 2.0 wt% ruthenium catalyst, which is prepared by calcinations at 573 K in flowing air for 6h.

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