Hierarchical Beta zeolites as catalysts in a one-pot three-component cascade Prins–Friedel–Crafts reaction

2020 ◽  
Vol 22 (20) ◽  
pp. 6992-7002 ◽  
Author(s):  
Roman Barakov ◽  
Nataliya Shcherban ◽  
Pavel Yaremov ◽  
Igor Bezverkhyy ◽  
Jiří Čejka ◽  
...  
Keyword(s):  
Relative Concentration ◽  
Acid Sites ◽  
Bronsted Acid ◽  
One Pot ◽  
Brønsted Acid Sites ◽  
Hierarchical Zeolites ◽  
Beta Zeolites ◽  
Brönsted Acid ◽  
Medium Strength ◽  
Hierarchical Beta

Enhanced 4-aryltetrahydropyran yields are correlated with the relative concentration of medium-strength Brønsted acid sites on the mesopore surface in hierarchical zeolites.

One-pot transformation of furfural into γ-valerolactone catalyzed by hierarchical Hf-Al-USY zeolite with balanced Lewis and Brønsted acid sites

2021 ◽  
Author(s):  
Bo Tang ◽  
Shuang Li ◽  
Wei-Chao Song ◽  
Yan Li ◽  
En-Cui Yang
Keyword(s):  
Lewis Acid ◽  
Value Added ◽  
Acid Sites ◽  
Bronsted Acid ◽  
Lewis Acid Sites ◽  
One Pot ◽  
Usy Zeolite ◽  
Brønsted Acid Sites ◽  
Brönsted Acid ◽  
Brønsted And Lewis Acid

Upgrading of furfural to high value-added chemicals are currently an attractive and challenging route in biorefineries. Herein, hierarchically structured bifunctional Hf-Al-USY zeolite with balanced Brønsted and Lewis acid sites has...

Enhanced Concentration of Medium Strength Brönsted Acid Sites in Aluminium-Modified β Zeolite

2011 ◽  
Vol 142 (1) ◽  
pp. 112-117 ◽  
Author(s):  
Dolores Esquivel ◽  
Aurora J. Cruz-Cabeza ◽  
César Jiménez-Sanchidrián ◽  
Francisco J. Romero-Salguero
Keyword(s):  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Β Zeolite ◽  
Brönsted Acid ◽  
Medium Strength ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites

Discussing the performance of beta zeolites in aqueous-phase valorization of xylose

2020 ◽  
Vol 10 (21) ◽  
pp. 7165-7176
Author(s):  
Tiago L. Coelho ◽  
Bruna Marinho ◽  
Elise M. Albuquerque ◽  
Marco A. Fraga
Keyword(s):  
Aqueous Phase ◽  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Beta Zeolites ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites

Beta zeolites are potential catalysts for xylose upgrade to bioproducts and selectivity is determined by the balance between water-tolerant Lewis and Brønsted acid sites.

Selective regulation of n-dodecane isomerization and cracking performance in Pt/Beta catalysts via oriented control of Brönsted acid sites distribution

2021 ◽  
Author(s):  
Zhiqiang Chen ◽  
Suyao Liu ◽  
Huaike Zhang ◽  
Peng He ◽  
Jie Ren ◽  
...  
Keyword(s):  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Beta Zeolites ◽  
Brönsted Acid ◽  
Cracking Performance ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites ◽  
Catalyzed Reactions

The location of Brönsted acid sites in zeolites has been recognized as an important factor in acid-catalyzed reactions. In this work, two Beta zeolites with different Brönsted acid sites distribution...

scholarly journals On the Role of Protonic Acid Sites in Cu Loaded FAU31 Zeolite as a Catalyst for the Catalytic Transformation of Furfural to Furan

Molecules ◽  
2021 ◽  
Vol 26 (7) ◽  
pp. 2015
Author(s):  
Łukasz Kuterasiński ◽  
Małgorzata Smoliło-Utrata ◽  
Joanna Kaim ◽  
Wojciech Rojek ◽  
Jerzy Podobiński ◽  
...  
Keyword(s):  
Active Sites ◽  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Protonic Acid ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites

The aim of the present paper is to study the speciation and the role of different active site types (copper species and Brønsted acid sites) in the direct synthesis of furan from furfural catalyzed by copper-exchanged FAU31 zeolite. Four series of samples were prepared by using different conditions of post-synthesis treatment, which exhibit none, one or two types of active sites. The catalysts were characterized by XRD, low-temperature sorption of nitrogen, SEM, H2-TPR, NMR and by means of IR spectroscopy with ammonia and CO sorption as probe molecules to assess the types of active sites. All catalyst underwent catalytic tests. The performed experiments allowed to propose the relation between the kind of active centers (Cu or Brønsted acid sites) and the type of detected products (2-metylfuran and furan) obtained in the studied reaction. It was found that the production of 2-methylfuran (in trace amounts) is determined by the presence of the redox-type centers, while the protonic acid sites are mainly responsible for the furan production and catalytic activity in the whole temperature range. All studied catalysts revealed very high susceptibility to coking due to polymerization of furfural.

scholarly journals Adsorption Thermodynamics and Intrinsic Activation Parameters for Monomolecular Cracking of n-Alkanes on Brønsted Acid Sites in Zeolites

2015 ◽  
Vol 119 (19) ◽  
pp. 10427-10438 ◽  
Author(s):  
Amber Janda ◽  
Bess Vlaisavljevich ◽  
Li-Chiang Lin ◽  
Shaama Mallikarjun Sharada ◽  
Berend Smit ◽  
...  
Keyword(s):  
Activation Parameters ◽  
Acid Sites ◽  
Adsorption Thermodynamics ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites
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