Showing papers by "Sabahudin Hrapovic published in 2012"
TL;DR: The strategy promotes the use of natural resources to prepare reusable hybrid inorganic-organic materials for important reactions with facilitated product isolation/purification by using carbonate-stabilized Au nanoparticles decorated on a network of crystalline cellulose fibers.
Abstract: A novel nanocomposite was prepared by deposition of carbonate-stabilized Au nanoparticles (AuNPs) onto the surface of poly(diallyldimethyl ammonium chloride) (PDDA)-coated carboxylated nanocrystalline cellulose (NCC). The hybrid material possessed AuNPs (1.45% by weight) with an average diameter of 2.95 ± 0.06 nm. The catalytic activity of AuNP/PDDA/NCC for reducing 4-nitrophenol to 4-aminophenol was compared to other Au-supported composites. An activation energy of 69.2 kJ mol−1 was obtained for the reaction. Indeed, the reaction rate constant k of (5.1 ± 0.2) × 10−3 s−1 was comparable to the benchmark literature value obtained using AuNPs (<5 nm in diameter) decorated on a network of crystalline cellulose fibers. Our strategy promotes the use of natural resources to prepare reusable hybrid inorganic–organic materials for important reactions with facilitated product isolation/purification.
174 citations
TL;DR: Graphene, graphene oxide, sulfonated graphene oxide (SGO) have been shown to be a rapid and water-tolerant solid acid catalyst even at very low catalyst loadings down to 0.5% vs xylose, maintaining its initial activity after 12 repetitions at 200°C, with an average yield of 61% in comparison to 44% for the uncatalyzed system as discussed by the authors.
150 citations