Catalytic performance of Brønsted acid sites during esterification of acetic acid with ethyl alcohol over phosphotungestic acid supported on silica

2007 ◽  
Vol 82 (6) ◽  
pp. 513-523 ◽  
Author(s):  
Abd El-Aziz A Said ◽  
Mohamed M M Abd El-Wahab ◽  
Alian Mohamed Alian
Keyword(s):  
Acetic Acid ◽  
Ethyl Alcohol ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites

Efficient conversion of glucose to 5-hydroxymethylfurfural using bifunctional partially hydroxylated AlF3

RSC Advances ◽  
2016 ◽  
Vol 6 (16) ◽  
pp. 12782-12787 ◽  
Author(s):  
Ye-Min Lu ◽  
Hu Li ◽  
Jian He ◽  
Yan-Xiu Liu ◽  
Zhi-Bing Wu ◽  
...  
Keyword(s):  
Catalytic Performance ◽  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Efficient Conversion ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites

Mesoporous AlF3 material bearing both Lewis and Brønsted acid sites exhibits high catalytic performance in glucose-to-fructose isomerization and subsequent dehydration to HMF (57.3% yield).

scholarly journals Achieving acid sites accessibility and pore compatibility in MWW nanosheets for alkylation of benzene with 1-dodecene

2021 ◽  
Author(s):  
Baoyu Liu ◽  
Zhantu Liao ◽  
Jianwen Zhang ◽  
Yeqing Huang
Keyword(s):  
Shape Selectivity ◽  
Catalytic Performance ◽  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Brönsted Acid ◽  
Alkylation Of Benzene ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites

Regularly spaced MWW nanosheets combined with single-unit-cell thickness and optimized Al species distribution are highly effective for the alkylation between benzene with 1-dodecene, high conversion of 1-dodecene (ca. 85 %) and selectivity of 2-LAB (ca. 80 %) can be obtained. Detailed studies of this MWW nanaosheets system reveal that ultra-thin MWW nanosheets with ordered arrangement can expose more accessible Brønsted acid sites (ca. ~89 %), and specially place framework Al species on the T2 sites (ca. ~13 %), in which the alkylation mainly occurred under the catalysis of accessible Brønsted acid sites. Besides, the desired 2-LAB is produced on the unique 12-MR hemicavities with solid binding energy and perfect steric configuration. As a proof-of-concept study, we integrate the highly exposed Brønsted acid sites and unrivalled shape-selectivity in the regularly spaced MWW nanosheets system with well characterized acid sites accessibility and pore adaptability, leading to the excellent catalytic performance.

scholarly journals Enhancing the conversion of ethyl levulinate to γ-valerolactone over Ru/UiO-66 by introducing sulfonic groups into the framework

RSC Advances ◽  
2018 ◽  
Vol 8 (30) ◽  
pp. 16611-16618 ◽  
Author(s):  
Jie Yang ◽  
Wenjuan Huang ◽  
Yongsheng Liu ◽  
Tao Zhou
Keyword(s):  
Catalytic Performance ◽  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Hydrogenation Activity ◽  
Ethyl Levulinate ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites

Ru/UiO-66 modified with –SO3H groups shows good acidic catalytic performance while also showing hydrogenation activity towards CO bonds, thus improving the overall transformation of EL to GVL due to the presence of strong Brønsted acid sites.

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

Trimethylsilylation of Framework Brønsted Acid Sites in Microporous Zeolites and Silico-Aluminophosphates

2003 ◽  
Vol 125 (46) ◽  
pp. 13964-13965 ◽  
Author(s):  
Weiguo Song ◽  
David M. Marcus ◽  
Saifudin M. Abubakar ◽  
Emma Jani ◽  
James F. Haw
Keyword(s):  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites

2,6-Dimethylpyridine as a probe of the strength of Brønsted acid sites: study on zeolites. Application to alumina

2005 ◽  
Vol 7 (8) ◽  
pp. 1861-1869 ◽  
Author(s):  
Laetitia Oliviero ◽  
Alexandre Vimont ◽  
Jean-Claude Lavalley ◽  
Francisca Romero Sarria ◽  
Marina Gaillard ◽  
...  
Keyword(s):  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites

Quantification of Strong Brønsted Acid Sites in Aluminosilicates

2010 ◽  
Vol 114 (18) ◽  
pp. 8363-8374 ◽  
Author(s):  
Emiel J. M. Hensen ◽  
Dilip G. Poduval ◽  
D. A. J. Michel Ligthart ◽  
J. A. Rob van Veen ◽  
Marcello S. Rigutto
Keyword(s):  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites
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