One-pot conversion of furfural to useful bio-products in the presence of a Sn,Al-containing zeolite beta catalyst prepared via post-synthesis routes
authors Antunes, MM; Lima, S; Neves, P; Magalhaes, AL; Fazio, E; Fernandes, A; Neri, F; Silva, CM; Rocha, SM; Eiro, MFR; Pillinger, M; Urakawa, A; Valente, AA
nationality International
journal JOURNAL OF CATALYSIS
author keywords Furfural; Bio-products; Zeolite beta; Dealumination; Solid state ion-exchange; Acid catalysis; Catalytic reduction
keywords MEERWEIN-PONNDORF-VERLEY; BAEYER-VILLIGER OXIDATION; FLUIDIZED-BED REACTOR; LEWIS-ACID CATALYSTS; GAMMA-VALEROLACTONE; TRANSFER HYDROGENATION; LEVULINIC ACID; ETHYL LEVULINATE; SN-BETA; AQUEOUS-PHASE
abstract Aiming at the valorisation of furfural (Fur) via sustainable routes based on process intensification and heterogeneous catalysis, the one-pot conversion of this renewable platform chemical to useful bio-products, namely furfuryl alkyl ethers (FEs), levulinate esters (LEs), levulinic acid (LA), angelica lactones (AnLs) and gamma-valerolactone (GVL), was investigated using a single heterogeneous catalyst, in 2-butanol, at 120 degrees C. Various chemical reactions are involved in this process, which requires catalysts with active sites for acid and reduction chemistry. For this purpose, it was explored for the first time the catalytic potentialities of modified versions of zeolite beta containing Al and Sn sites prepared from commercially available nanocrystalline zeolite beta via post-synthesis partial dealumination followed by solid-state ion-exchange. The post-synthesis conditions influenced considerably the catalytic performances of these types of materials. The best-performing catalyst was (Sn)(SSIE)-beta1 with Si/(Al + Sn) = 19 (Sn/Al = 27), which led to total yield of bio-products of 83% at 86% Fur conversion, and exhibited steady catalytic performance for six consecutive runs. A systematic catalytic study using the prepared catalysts with different bio-products as substrates, together with the molecular level and microstructural characterisation of the materials, helped understand the effects of different material properties on the specific reaction pathways in the overall system. These studies led to mechanistic insights into the reaction network of Fur to the bio-products in alcohol media, upon which a kinetic model was developed for the first time. The superior performance of (Sn)(SSIE)-beta1 in various steps was related to the dealumination degree, dispersion and amount of Sn-sites, and acid properties. (C) 2015 Elsevier Inc. All rights reserved.
publisher ACADEMIC PRESS INC ELSEVIER SCIENCE
issn 0021-9517
year published 2015
volume 329
beginning page 522
ending page 537
digital object identifier (doi) 10.1016/j.jcat.2015.05.022
web of science category Chemistry, Physical; Engineering, Chemical
subject category Chemistry; Engineering
unique article identifier WOS:000361250800050
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journal analysis (jcr 2017):
journal impact factor 6.759
5 year journal impact factor 7.502
category normalized journal impact factor percentile 88.979
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