scholarly journals Non-oxidative dehydrogenation of isobutane over supported vanadium oxide: nature of the active sites and coke formation

2020 ◽  
Vol 10 (18) ◽  
pp. 6139-6151 ◽  
Author(s):  
Alberto Rodriguez-Gomez ◽  
Abhishek Dutta Chowdhury ◽  
Mustafa Caglayan ◽  
Jeremy A. Bau ◽  
Edy Abou-Hamad ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Vanadium Oxide ◽  
Oxidative Dehydrogenation ◽  
Active Sites ◽  
Coke Formation ◽  
Temperature Programmed Reduction ◽  
Structure Activity Relationships ◽  
Structure Activity ◽  
Temperature Programmed ◽  
Oxidative Dehydrogenation Of Isobutane

We combine Raman spectroscopy, EPR, XPS, temperature programmed reduction, XRD, 51V MAS ssNMR, TEM and N2-physisorption to unravel structure–activity relationships during the non-oxidative dehydrogenation of isobutane over a V based catalyst.

scholarly journals Porosity Design of Shaped Zeolites for Improved Catalyst Lifetime in the Methanol-to-Hydrocarbons Reaction

Catalysts ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 545 ◽  
Author(s):  
Rogéria Bingre ◽  
Renna Li ◽  
Qiang Wang ◽  
Patrick Nguyen ◽  
Thomas Onfroy ◽  
...  
Keyword(s):  
Pore Volume ◽  
Active Sites ◽  
Coke Formation ◽  
Effective Diffusivity ◽  
Nitrogen Adsorption ◽  
Breakthrough Time ◽  
Methanol To Hydrocarbons ◽  
Catalytic Stability ◽  
Temperature Programmed ◽  
Adsorption Desorption

Additional porosity, such as meso- and macropores, was introduced in zeolite extrudates with the intention intuit of improving the effective diffusivity of the catalysts. The samples were characterized in depth by nitrogen adsorption-desorption, mercury intrusion porosimetry, ammonia temperature programmed desorption and adsorption of pyridine followed by infrared spectroscopy. The results revealed no significant change in the acidity but an increase of the pore volume. According to significant improvement in the effective diffusivity, the samples were tested in the methanol-to-hydrocarbons reaction. The catalytic stability was greatly enhanced with an increase in the pore volume, demonstrating a relation between effective diffusivity and resistance to deactivation by coke formation. Further experiments also revealed a higher toluene adsorption capacity and a raise in the breakthrough time over the most porous samples due to better accessibility of toluene molecules into the active sites of the zeolite.

scholarly journals Structure−Activity Relationships in Gold Nanoparticle Dimers and Trimers for Surface-Enhanced Raman Spectroscopy

2010 ◽  
Vol 132 (31) ◽  
pp. 10903-10910 ◽  
Author(s):  
Kristin L. Wustholz ◽  
Anne-Isabelle Henry ◽  
Jeffrey M. McMahon ◽  
R. Griffith Freeman ◽  
Nicholas Valley ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Gold Nanoparticle ◽  
Surface Enhanced Raman Spectroscopy ◽  
Structure Activity Relationships ◽  
Structure Activity ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Bis-coumarin Derivatives and Their Biological Activities

2018 ◽  
Vol 18 (2) ◽  
pp. 101-113 ◽  
Author(s):  
Qing-Cheng Ren ◽  
Chuan Gao ◽  
Zhi Xu ◽  
Lian-Shun Feng ◽  
Ming-Liang Liu ◽  
...  
Keyword(s):  
Clinical Practice ◽  
Active Sites ◽  
Noncovalent Interactions ◽  
Biological Activities ◽  
Coumarin Derivatives ◽  
Antitumor Activities ◽  
Structure Activity Relationships ◽  
Structure Activity ◽  
Biological Potential

Bis-coumarins have caused great interests in the recent years. These compounds exhibit diverse biological activities which are ascribed to their ability to exert noncovalent interactions with the various active sites in organisms. Some of them such as dicoumarolum and dicoumarol were approved for therapeutic purposes in clinical practice. Encouraged by the above facts, numerous biscoumarin derivatives have been synthesized and screened for their biological activities, and many of them showed promising potency. This review is focused on the biological potential of bis-coumarin derivatives with particular mention of those exhibiting antibacterial, anticoagulant, antiinflammatory, antiviral, anti-parasite and antitumor activities, and their structure-activity relationships are also discussed.

ESR, IR, and temperature programmed reduction evidence for strong oxide-oxide interaction between vanadium oxide and magnesia

1985 ◽  
Vol 16 (2) ◽  
pp. 153-156 ◽  
Author(s):  
M. Iwamoto ◽  
T. Takenaka ◽  
K. Matsukami ◽  
J. Hirata ◽  
S. Kagawa ◽  
...  
Keyword(s):  
Vanadium Oxide ◽  
Temperature Programmed Reduction ◽  
Temperature Programmed
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