scholarly journals Catalytic Ozonation of Toluene Using Chilean Natural Zeolite: The Key Role of Brønsted and Lewis Acid Sites

Catalysts ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 211 ◽  
Author(s):  
Serguei Alejandro-Martín ◽  
Héctor Valdés ◽  
Marie-Hélène Manero ◽  
Claudio Zaror
Keyword(s):  
Lewis Acid ◽  
Natural Zeolite ◽  
Acid Sites ◽  
Catalytic Ozonation ◽  
Lewis Acid Sites ◽  
Brønsted And Lewis Acid

scholarly journals Solid Acids for the Reaction of Bioderived Alcohols into Ethers for Fuel Applications

Catalysts ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 172 ◽  
Author(s):  
Federica Zaccheria ◽  
Nicola Scotti ◽  
Nicoletta Ravasio
Keyword(s):  
Physical Properties ◽  
Lignocellulosic Biomass ◽  
Lewis Acid ◽  
Product Distribution ◽  
Acid Sites ◽  
Solid Acids ◽  
Lewis Acid Sites ◽  
Hydroxymethyl Furfural ◽  
Brønsted And Lewis Acid

The use of solids acids in the synthesis of ethers suitable to be used as fuels or fuel additives were reviewed in a critical way. In particular, the role of Brønsted and Lewis acid sites was highlighted to focus on the pivotal role of the acidity nature on the product distribution. Particular emphasis is given to the recently proposed ethers prepared starting from furfural and 5-hydroxymethyl furfural. Thus, they are very promising products that can be derived from lignocellulosic biomass and bioalcohols and possess very interesting chemical and physical properties for their use in the diesel sector.

Role of Brønsted and Lewis acid sites on Ni/TiO2 catalyst for vapour phase hydrogenation of levulinic acid: Kinetic and mechanistic study

2015 ◽  
Vol 505 ◽  
pp. 217-223 ◽  
Author(s):  
Velisoju Vijay Kumar ◽  
Gutta Naresh ◽  
Medak Sudhakar ◽  
James Tardio ◽  
Suresh K. Bhargava ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Levulinic Acid ◽  
Vapour Phase ◽  
Acid Sites ◽  
Mechanistic Study ◽  
Lewis Acid Sites ◽  
Tio2 Catalyst ◽  
Brønsted And Lewis Acid

The Role of Brønsted and Lewis Acid Sites in Acetalization of Glycerol over Modified Mesoporous Cellular Foams

2016 ◽  
Vol 120 (30) ◽  
pp. 16699-16711 ◽  
Author(s):  
Katarzyna Stawicka ◽  
Alba E. Díaz-Álvarez ◽  
Vanesa Calvino-Casilda ◽  
Maciej Trejda ◽  
Miguel A. Bañares ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Cellular Foams ◽  
Brønsted And Lewis Acid

Natural Zeolite Reactivity Towards Ozone: The Role of Acid Surface Sites

2011 ◽  
Vol 14 (2) ◽  
Author(s):  
Serguei Alejandro ◽  
Héctor Valdés ◽  
Claudio. A. Zaror
Keyword(s):  
Lewis Acid ◽  
Natural Zeolite ◽  
Noble Metals ◽  
Ground Level ◽  
Acid Sites ◽  
Air Pollutant ◽  
Lewis Acid Sites ◽  
Surface Sites ◽  
Gaseous Ozone

AbstractGround-level ozone is an air pollutant which interferes with plant photosynthesis, stunts overall growth of some plant species, and harms animal respiratory systems. Activated carbon, synthetic zeolites, metal oxides and noble metals have been used as catalysts to destroy ozone. However, the high costs of these materials impair their application at full-scale. Low cost natural zeolites could be an interesting option for ozone elimination. In this work, the influence of Chilean natural zeolite chemical surface properties on gaseous ozone removal was evaluated. Chemical modifications of Chilean natural zeolite showed the role of acid surface sites and the Si/Al ratio on gaseous ozone abatement. Samples were characterised by nitrogen adsorption at 77 K, elemental analyses, X-ray fluorescence (XRF), temperature-programmed desorption (TPD), and hygroscopic analyses. The influence of air humidity on gaseous ozone removal using natural and modified zeolite samples was also evaluated. The results showed that lower Si/Al ratio corresponds to a higher density of Lewis acid sites. It was found that increasing the zeolite surface area does not improve gaseous ozone removal. The conversion of Brønsted acid sites into Lewis acid sites at 823 K led to an increase on ozone removal.

Comprehensive Understanding of the Role of Brønsted and Lewis Acid Sites in Glucose Conversion into 5-Hydromethylfurfural

ChemCatChem ◽  
2017 ◽  
Vol 9 (14) ◽  
pp. 2739-2746 ◽  
Author(s):  
Xiangcheng Li ◽  
Kaihao Peng ◽  
Xiaohui Liu ◽  
Qineng Xia ◽  
Yanqin Wang
Keyword(s):  
Lewis Acid ◽  
Acid Sites ◽  
Comprehensive Understanding ◽  
Lewis Acid Sites ◽  
Brønsted And Lewis Acid

scholarly journals A Supramolecular View on the Cooperative Role of Brønsted and Lewis Acid Sites in Zeolites for Methanol Conversion

2019 ◽  
Vol 141 (37) ◽  
pp. 14823-14842 ◽  
Author(s):  
Simon Bailleul ◽  
Irina Yarulina ◽  
Alexander E. J. Hoffman ◽  
Abhay Dokania ◽  
Edy Abou-Hamad ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Methanol Conversion ◽  
Acid Sites ◽  
Lewis Acid Sites ◽  
Brønsted And Lewis Acid
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