TY - JOUR AU - Tukacs, József Márk AU - Novák, Márton AU - Dibó, Gábor AU - Mika, László Tamás TI - An improved catalytic system for the reduction of levulinic acid gamma-valerolactone JF - CATALYSIS SCIENCE & TECHNOLOGY J2 - CATAL SCIENCE & TECHNOLOGY VL - 4 PY - 2014 IS - 9 SP - 2908 EP - 2912 PG - 5 SN - 2044-4753 DO - 10.1039/c4cy00719k UR - https://m2.mtmt.hu/api/publication/2725898 ID - 2725898 N1 - Department of Chemical and Environmental Process Engineering, Budapest University of Technology and Economics, Budapest, Hungary Institute of Chemistry, Eötvös Loránd University, Budapest, Hungary Cited By :48 Export Date: 27 November 2019 CODEN: CSTAG Correspondence Address: Mika, L.T.; Department of Chemical and Environmental Process Engineering, Budapest University of Technology and Economics, Budapest, Hungary; email: laszlo.t.mika@mail.bme.hu AB - An improved bidentate phosphine-modified recyclable catalytic system was developed for the selective conversion of biomass-derived levulinic acid into gamma-valerolactone with a TOF of 21 233 h(-1) in solvent-, chlorine- and additive-free reaction environments. LA - English DB - MTMT ER - TY - JOUR AU - Viktória, Fábos AU - Mika, László Tamás AU - Horváth, István Tamás TI - Selective Conversion of Levulinic and Formic Acids to γ-Valerolactone with the Shvo Catalyst JF - ORGANOMETALLICS J2 - ORGANOMETALLICS VL - 33 PY - 2014 IS - 1 SP - 181 EP - 187 PG - 7 SN - 0276-7333 DO - 10.1021/om400938h UR - https://m2.mtmt.hu/api/publication/2500395 ID - 2500395 N1 - Cited By :82 Export Date: 8 January 2019 CODEN: ORGND Correspondence Address: Horváth, I.T.; Institute of Chemistry, Eötvös University, Pázmány Péter 1/A, H-1117 Budapest, Hungary; email: istvan.t.horvath@cityu.edu.hk Cited By :90 Export Date: 27 November 2019 CODEN: ORGND Correspondence Address: Horváth, I.T.; Institute of Chemistry, Eötvös University, Pázmány Péter 1/A, H-1117 Budapest, Hungary; email: istvan.t.horvath@cityu.edu.hk Cited By :105 Export Date: 7 April 2021 CODEN: ORGND Correspondence Address: Horváth, I.T.; Institute of Chemistry, Pázmány Péter 1/A, H-1117 Budapest, Hungary; email: istvan.t.horvath@cityu.edu.hk Cited By :107 Export Date: 3 July 2021 CODEN: ORGND Correspondence Address: Horváth, I.T.; Institute of Chemistry, Pázmány Péter 1/A, H-1117 Budapest, Hungary; email: istvan.t.horvath@cityu.edu.hk Cited By :111 Export Date: 1 September 2021 CODEN: ORGND Correspondence Address: Horváth, I.T.; Institute of Chemistry, Pázmány Péter 1/A, H-1117 Budapest, Hungary; email: istvan.t.horvath@cityu.edu.hk LA - English DB - MTMT ER - TY - JOUR AU - Qi, L AU - Horváth, István Tamás TI - Catalytic Conversion of Fructose to gamma-Valerolactone in gamma-Valerolactone JF - ACS CATALYSIS J2 - ACS CATAL VL - 2 PY - 2012 IS - 11 SP - 2247 EP - 2249 PG - 3 SN - 2155-5435 DO - 10.1021/cs300428f UR - https://m2.mtmt.hu/api/publication/3181637 ID - 3181637 N1 - Cited By :97 Export Date: 8 January 2019 Correspondence Address: Horváth, I.T.; Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong; email: istvan.t.horvath@cityu.edu.hk Cited By :118 Export Date: 27 November 2019 Correspondence Address: Horváth, I.T.; Department of Biology and Chemistry, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong; email: istvan.t.horvath@cityu.edu.hk AB - The one-pot conversion of fructose to gamma-valerolactone (GVL) in GVL as solvent was confirmed by monitoring the dehydration of C-13(6)-D-fructose to C-13(6)-5-(hydroxymethyl)-2-furaldehyde (C-13(6)-HMF), the hydration of C-13(6)-HMF to C-13(5)-levulinic and C-13-formic acids, followed by their conversion to C-13(5)-GVL. LA - English DB - MTMT ER - TY - JOUR AU - Tuck, Christopher O AU - Pérez, Eduardo AU - Horváth, István Tamás AU - Sheldon, Roger A AU - Poliakoff, Martyn TI - Valorization of Biomass: Deriving More Value from Waste JF - SCIENCE J2 - SCIENCE VL - 337 PY - 2012 IS - 6095 SP - 695 EP - 699 PG - 5 SN - 0036-8075 DO - 10.1126/science.1218930 UR - https://m2.mtmt.hu/api/publication/2042107 ID - 2042107 N1 - University of Nottingham, Nottingham NG7 2RD, United Kingdom City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong Delft University of Technology, Delft, Netherlands Cited By :885 Export Date: 27 November 2019 CODEN: SCIEA Correspondence Address: Horváth, I.T.; City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong; email: istvan.t.horvath@cityu.edu.hk AB - Most of the carbon-based compounds currently manufactured by the chemical industry are derived from petroleum. The rising cost and dwindling supply of oil have been focusing attention on possible routes to making chemicals, fuels, and solvents from biomass instead. In this context, many recent studies have assessed the relative merits of applying different dedicated crops to chemical production. Here, we highlight the opportunities for diverting existing residual biomass—the by-products of present agricultural and food-processing streams—to this end. LA - English DB - MTMT ER - TY - JOUR AU - Horváth, István Tamás AU - Mehdi, Hasan AU - Fabos, V AU - Boda, L AU - Mika, László Tamás TI - gamma-Valerolactone - a sustainable liquid for energy and carbon-based chemicals JF - GREEN CHEMISTRY J2 - GREEN CHEM VL - 10 PY - 2008 IS - 2 SP - 238 EP - 242 PG - 5 SN - 1463-9262 DO - 10.1039/b712863k UR - https://m2.mtmt.hu/api/publication/1767681 ID - 1767681 AB - We propose that gamma-valerolactone (GVL), a naturally occurring chemical in fruits and a frequently used food additive, exhibits the most important characteristics of an ideal sustainable liquid, which could be used for the production of both energy and carbon-based consumer products. GVL is renewable, easy and safe to store and move globally in large quantities, has low melting (231 degrees C), high boiling (207 degrees C) and open cup flash (96 degrees C) points, a definitive but acceptable smell for easy recognition of leaks and spills, and is miscible with water, assisting biodegradation. We have established that its vapor pressure is remarkably low, even at higher temperatures (3.5 kPa at 80 degrees C). We have also shown by using (18)O-labeled water that GVL does not hydrolyze to gamma-hydroxypentanoic acid under neutral conditions. In contrast, after the addition of acid (HCl) the incorporation of one or two (18)O-isotopes to GVL was observed, as expected. GVL does not form a measurable amount of peroxides in a glass flask under air in weeks, making it a safe material for large scale use. Comparative evaluation of GVL and ethanol as fuel additives, performed on a mixture of 10 v/v% GVL or EtOH and 90 v/v% 95-octane gasoline, shows very similar properties. Since GVL does not form an azeotrope with water, the latter can be readily removed by distillation, resulting in a less energy demanding process for the production of GVL than that of absolute ethanol. Finally, it is also important to recognize that the use of a single chemical entity, such as GVL, as a sustainable liquid instead of a mixture of compounds, could significantly simplify its worldwide monitoring and regulation. LA - English DB - MTMT ER - TY - JOUR AU - Mehdi, Hasan AU - Fabos, V AU - Tuba, Róbert AU - Bodor, Andrea AU - Mika, László Tamás AU - Horváth, István Tamás TI - Integration of homogeneous and heterogeneous catalytic processes for a multi-step conversion of biomass: From sucrose to levulinic acid, gamma-valerolactone, 1,4-pentanediol, 2-methyl-tetrahydrofuran, and alkanes JF - TOPICS IN CATALYSIS J2 - TOP CATAL VL - 48 PY - 2008 IS - 1-4 SP - 49 EP - 54 PG - 6 SN - 1022-5528 DO - 10.1007/s11244-008-9047-6 UR - https://m2.mtmt.hu/api/publication/1482706 ID - 1482706 AB - The multi-step conversion of sucrose to various C-5-oxygenates and alkanes was achieved by integrating various homogeneous and heterogeneous catalytic systems. We have confirmed that the dehydration of sucrose to levulinic and formic acids is currently limited to about 30-40% in the presence of H2SO4, HCl, or Nafion NR50 in water. Performing the dehydration in the presence of a P(m-C6H4SO3Na)(3) modified ruthenium catalyst under hydrogen resulted in the in situ conversion of levulinic acid to gamma-valerolactone (GVL). Levulinic acid can be hydrogenated to GVL quantitatively by using P(m-C6H4SO3Na)(3) modified ruthenium catalyst in water or Ru(acac)(3)/PBu3/NH4PF6 catalyst in neat levulinic acid. Formic acid can be used for the transfer hydrogenation of levulinic acid in water in the presence of [(eta(6)-C6Me6)Ru(bpy)(H2O)][SO4] resulting in GVL and 1,4-pentanediol. The hydrogenation of levulinic acid or GVL can be performed to yield 1,4-pentanediol and/or 2-methyl-tetrahydrofuran (2-Me-THF). The hydrogenolysis of 2-Me-THF in the presence of Pt(acac)(2) in CF3SO3H resulted in a mixture of alkanes. We have thus demonstrated that the conversion of carbohydrates to various C-5-oxygenates and even to alkanes can be achieved by selecting the proper catalysts and conditions, which could provide a renewable platform for the chemical industry. LA - English DB - MTMT ER -