Mechanism of H/D Hydrogen Exchange of n-Butane with Brønsted Acid Sites on Zn-Modified Zeolite: The Effect of Different Zn Species (Zn2+ and ZnO) on the Activation of Alkane C–H Bonds

2020 ◽  
Vol 124 (37) ◽  
pp. 20270-20279
Author(s):  
Sergei S. Arzumanov ◽  
Anton A. Gabrienko ◽  
Alexander V. Toktarev ◽  
Dieter Freude ◽  
Jürgen Haase ◽  
...  
Keyword(s):  
Hydrogen Exchange ◽  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Modified Zeolite ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites

Competitive pathways of methane activation on Zn2+-modified ZSM-5 zeolite: H/D hydrogen exchange with Brønsted acid sites versus dissociative adsorption to form Zn-methyl species

2016 ◽  
Vol 6 (16) ◽  
pp. 6381-6388 ◽  
Author(s):  
Sergei S. Arzumanov ◽  
Anton A. Gabrienko ◽  
Dieter Freude ◽  
Alexander G. Stepanov
Keyword(s):  
Hydrogen Exchange ◽  
Dissociative Adsorption ◽  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites ◽  
Zeolite P

Zn-methyl species is not responsible for facilitation of the H/D hydrogen exchange reaction of methane with Brønsted acid sites of Zn2+/H-ZSM-5 zeolite.

scholarly journals BTX abatement using Chilean natural zeolite: the role of Brønsted acid sites

2012 ◽  
Vol 66 (8) ◽  
pp. 1759-1765 ◽  
Author(s):  
S. Alejandro ◽  
H. Valdés ◽  
M.-H. Manero ◽  
C. A. Zaror
Keyword(s):  
Natural Zeolite ◽  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Modified Zeolite ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites

In wastewater treatment facilities, air quality is not only affected by conventional unpleasant odour compounds; toxic volatile organic compounds (VOCs) are also found. In this study, the adsorptive capacity of Chilean natural zeolite toward VOC removal was evaluated. Moreover, the influence of zeolite chemical surface properties on VOC elimination was also investigated. Three modified zeolite samples were prepared from a natural Chilean zeolite (53% clinoptilolite, 40% mordenite and 7% quartz). Natural and modified zeolite samples were characterised by nitrogen adsorption at 77 K, elemental analyses and X-ray fluorescence (XRF). Chemical modifications of natural zeolite showed the important role of Brønsted acid sites on the abatement of VOCs. The presence of humidity has a negative effect on zeolite adsorption capacity. Natural zeolites could be an interesting option for benzene, toluene and xylene vapour emission abatement.

Methane Activation on In-Modified ZSM-5 Zeolite. H/D Hydrogen Exchange of the Alkane with Brønsted Acid Sites

2014 ◽  
Vol 118 (26) ◽  
pp. 14427-14432 ◽  
Author(s):  
Sergei S. Arzumanov ◽  
Ilya B. Moroz ◽  
Dieter Freude ◽  
Jürgen Haase ◽  
Alexander G. Stepanov
Keyword(s):  
Hydrogen Exchange ◽  
Acid Sites ◽  
Methane Activation ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted Acid Sites

H/D exchange of molecular hydrogen with Brønsted acid sites of Zn- and Ga-modified zeolite BEA

2010 ◽  
Vol 12 (19) ◽  
pp. 5149 ◽  
Author(s):  
Anton A. Gabrienko ◽  
Sergei S. Arzumanov ◽  
Alexander V. Toktarev ◽  
Irina G. Danilova ◽  
Dieter Freude ◽  
...  
Keyword(s):  
Molecular Hydrogen ◽  
Acid Sites ◽  
Bronsted Acid ◽  
Brønsted Acid ◽  
Brønsted Acid Sites ◽  
Modified Zeolite ◽  
Brönsted Acid ◽  
Brönsted Acid Sites ◽  
Bronsted 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
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