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Catalytic conversion of model tars over carbon-supported Ni and Fe

: Arteaga-Pérez, Luis E.; Delgado, Aaron M.; Flores, Mauricio; Olivera, Patricia; Matschuk, Kimberley; Hamel, Christian; Schulzke, Tim; Jiménez, Romel

Volltext urn:nbn:de:0011-n-4876768 (1.6 MByte PDF)
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Erstellt am: 28.3.2018

Catalysts 8 (2018), Nr.3, Art. 119, 18 S.
ISSN: 2073-4344
Bundesministerium für Bildung und Forschung BMBF
Bioeconomy international; 031B0176; ComCatTar
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer UMSICHT Oberhausen ()
activated carbon; tar; catalytic gas upgrading

Tar removal from gasification gases is a determinant step to guarantee the operational feasibility of gasification-to-chemicals/energy systems. This study aimed to develop novel carbon-supported catalysts for the elimination of tarry aromatics (toluene, naphthalene and benzene) from gasification gases. Effects of reaction temperature (700 < T < 900 °C) and catalyst nature (Fe0 and Ni0) on the activity were assessed by considering thermo-catalytic conversion and steam reforming, under a simulated gasification gas. The catalysts (Ni and Fe) and support (AC) were characterized by X-ray diffraction (XRD), N2 physisorption, thermogravimetric analysis (TGA), transmission electron microscopy (TEM) and compositional analyses. Both catalysts and support, presented a mesoporous-like texture with a considerable high surface area (690 < SBET < 743 m2/g). Furthermore, dispersion of the metal nanoparticles (active phase) was uniform as confirmed by TEM images. Results from activity tests suggest that Ni/AC has higher effectivity for converting tars than Fe/AC, as confirmed by the low apparent activation energies (34 < Eapp < 98 kJ/mol) for naphthalene and benzene conversion between 700 and 900 °C. The conversion was 100% above 850 °C; nevertheless; below 750 °C, a sharp reduction in benzene conversion was observed, which was attributed to reversible carbon deposition.