title: Fe-based heterogeneous catalysts for the Fischer-Tropsch reaction: Sonochemical synthesis and bench-scale experimental tests.
abstract: The sonochemical synthesis of nanostructured materials owes its origins to the extreme conditions created during acoustic cavitation, i.e., the formation of localized hot spots in the core of collapsing bubbles in a liquid irradiated with high intensity ultrasound (US). In particular, in the present work a sonochemical synthesis has been investigated for the production of three different iron-based samples supported on SiO2and loaded with different metals and promoters (10 %wt of Fe; 30 %wt of Fe; 30 %wt of Fe, 2 %wt of K and 3.75 %wt of Cu) active in the Fischer-Tropsch (FT) process. Sonochemically synthesized heterogeneous catalysts were characterized by BET, XRPD, TPR, ICP, CHN, TEM, SEM and then tested in a fixed bed FT-bench-scale rig fed with a mixture of H2and CO at a H2/CO molar ratio equal to 2, at activation temperatures of 350-400°C and reaction temperatures of 250-260°C. The experimental results showed that the ultrasonic samples are effective catalysts for the FT process. Notably, increasing the activation temperature increased CO conversion, while product selectivity did not diminish. All the sonochemically prepared samples presented in this work provided better catalytic results compared to the corresponding traditional FT impregnated catalysts.
authors: Università degli Studi di Milano, Dipartimento di Chimica, via Golgi, 19, 20133 Milano, Italy. Electronic address: alberto.comazzi@unimi.it.
authors: Alberto
authors: A
authors: Comazzi
authors: Università degli Studi di Milano, Dipartimento di Chimica, via Golgi, 19, 20133 Milano, Italy.
authors: Carlo
authors: C
authors: Pirola
authors: Università degli Studi di Milano, Dipartimento di Chimica, via Golgi, 19, 20133 Milano, Italy.
authors: Mariangela
authors: M
authors: Longhi
authors: Università degli Studi di Milano, Dipartimento di Chimica, via Golgi, 19, 20133 Milano, Italy.
authors: Claudia L M
authors: CL
authors: Bianchi
authors: University of Illinois at Urbana-Champaign, School of Chemical Sciences, 505 S. Mathews Av., Urbana, IL 61801, USA.
authors: Kenneth S
authors: KS
authors: Suslick
keywords: Fischer Tropsch; Iron based catalysts; Sonochemical synthesis; Syngas; Ultrasound