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
Łukasz Kuterasiński ◽  
Małgorzata Smoliło-Utrata ◽  
Joanna Kaim ◽  
Wojciech Rojek ◽  
Jerzy Podobiński ◽  

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.

2012 ◽  
Vol 66 (8) ◽  
pp. 1759-1765 ◽  
S. Alejandro ◽  
H. Valdés ◽  
M.-H. Manero ◽  
C. A. Zaror

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.

ACS Catalysis ◽  
2018 ◽  
Vol 8 (3) ◽  
pp. 2200-2208 ◽  
Alyssa J. R. Hensley ◽  
Yong Wang ◽  
Donghai Mei ◽  
Jean-Sabin McEwen

2008 ◽  
Vol 336 (1-2) ◽  
pp. 79-88 ◽  
Jean-Philippe Tessonnier ◽  
Benoît Louis ◽  
Séverinne Rigolet ◽  
Marc Jacques Ledoux ◽  
Cuong Pham-Huu

ACS Catalysis ◽  
2014 ◽  
Vol 4 (9) ◽  
pp. 3180-3192 ◽  
Guo Shiou Foo ◽  
Daniel Wei ◽  
David S. Sholl ◽  
Carsten Sievers

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