A5016151116- Catalysis and Hydrodesulfurization Studies
- Catalytic Processes in Materials Science
- Catalysis for Biomass Conversion
- Lignin and Wood Chemistry
- Zeolite Catalysis and Synthesis
- Mesoporous Materials and Catalysis
- Nanomaterials for catalytic reactions
- Chemical Synthesis and Characterization
- Electrocatalysts for Energy Conversion
- Biofuel production and bioconversion
- Catalysis and Oxidation Reactions
- Chemical Synthesis and Reactions
- Metal-Organic Frameworks: Synthesis and Applications
- Catalysts for Methane Reforming
- Metal and Thin Film Mechanics
- Inorganic and Organometallic Chemistry
- Enzyme-mediated dye degradation
- Biochemical and biochemical processes
- Electrostatics and Colloid Interactions
- Advanced NMR Techniques and Applications
- Coal and Its By-products
- Gas Sensing Nanomaterials and Sensors
- Field-Flow Fractionation Techniques
- Surface Treatment and Coatings
- Selenium in Biological Systems
HUN-REN Centre for Energy Research
2018-2024
Hungarian Academy of Sciences
1991-2018
Eindhoven University of Technology
1993-2017
Institute of Inorganic Chemistry of the Slovak Academy of Sciences
2015-2017
Institute of Catalysis and Petrochemistry
1991-2016
KU Leuven
2010-2014
University of Namur
2003-2010
HUN-REN Research Centre for Natural Sciences
2003-2009
University of Pannonia
2006
Lawrence Berkeley National Laboratory
1999-2000
Abstract One‐step valorization of soda lignin in supercritical ethanol using a CuMgAlO x catalyst results high monomer yield (23 wt %) without char formation. Aromatics are the main products. The combines excellent deoxygenation with low ring‐hydrogenation activity. Almost half fraction is free from oxygen. Elemental analysis THF‐soluble residue after 8 h reaction showed 68 % reduction O/C and 24 increase H/C atomic ratios as compared to starting Protobind P1000 lignin. Prolonged times...
High monomer yield (60–86 wt%) with little char formation is possible from lignin. Ethanol acts as capping agent of aromatics, formaldehyde scavenger and hydrogen source, prevent repolymerization.
Beside steam reforming, methane pyrolysis is an alternative method for hydrogen production. ‘Turquoise’ with solid carbon formed in the process, contrary to ‘grey’ or ‘blue’ via where waste dioxide produced. Thermal conducted at higher temperatures, but catalytic decomposition of (CDM) a promising route sustainable CDM generally carried out over four types catalyst: nickel, carbon, noble metal and iron. The applied reactors can be fixed bed, fluidized plasma bed molten-metal reactors. Two...
The acetalization of acetone with glycerol to yield 2,2-dimethyl-1,3-dioxolane-4-methanol (solketal) was successfully catalyzed by mesoporous substituted silicates including the novel Hf-TUD-1 material. This reaction offers an attractive path for conversion glycerol, which is main side-product in synthesis biodiesel, a valuable compound potential industrial applications. most promising among heterogeneous catalysts employed this work, Zr- and Sn-MCM-41, display mainly Lewis acid properties...
We investigated the role of Cu–Mg–Al mixed oxides in depolymerization soda lignin supercritical ethanol. A series with varying Cu content and (Cu+Mg)/Al ratio were prepared. The optimum catalyst containing 20 wt % having a 4 yielded 36 monomers without formation char after reaction at 340 °C for h. Comparison Cu/MgO Cu/γ-Al2O3 catalysts emphasized excellent performance oxides. These catalyze between formaldehyde ethanol, which limits polymerization reactions phenolic products formaldehyde....
A catalytic process for the upgrading of woody biomass into mono-aromatics, hemi-cellulose sugars and a solid cellulose-rich carbohydrate residue is presented.
Abstract Adding value to lignin, the most complex and recalcitrant fraction in lignocellulosic biomass, is highly relevant costefficient operation of biorefineries. We report use homogeneous metal triflates rapidly release lignin from biomass. Combined with metal‐catalyzed hydrogenolysis, process separates woody biomass into few lignin‐derived alkylmethoxyphenols cellulose under mild conditions. Model compound studies show unique catalytic properties cleaving lignin–carbohydrate...
The one-step ethanolysis approach to upgrade lignin monomeric aromatics using a CuMgAl mixed oxide catalyst is studied in detail. influence of reaction temperature (200–420 °C) on the product distribution investigated. At low (200–250 °C), recondensation dominant, while char-forming reactions become significant at high (>380 °C). preferred intermediate temperatures (300–340 are effectively suppressed by alkylation and Guerbet esterification reactions. This shifts toward depolymerization,...
The 'lignin-first' approach has recently gained attention as an alternative whole biomass pretreatment technology with improved yield and selectivity of aromatics compared traditional upgrading processes using technical lignins. Metal triflates are effective co-catalysts that considerably speed up the removal lignin fragments from biomass. As their cost is too high in a scaled-up process, we explored here use HCl, H2SO4, H3PO4 CH3COOH acid for tandem reductive fractionation process. HCl...
As a perspective catalyst composition for methane non-oxidative decomposition/methane pyrolysis (CH4⇌C+2H2) yielding clean hydrogen and only solid carbon, the combination of nickel molybdenum on MgO support was investigated. With deliberately low Ni content strong metal-support interaction, 7%Ni4%Mo/MgO 7%Ni12%Mo/MgO catalysts monometallic references were prepared. Structural analysis performed using TPR, XRD, TEM, XPS Raman spectroscopy in reduced state after decomposition test. Catalytic...
The depolymerization of lignin to bioaromatics usually requires a hydrodeoxygenation (HDO) step lower the oxygen content. A mixed Cu-Mg-Al oxide (CuMgAlO x ) is an effective catalyst for in supercritical ethanol. We explored use Ni-based cocatalysts, i.e. Ni/SiO2, Ni2P/SiO2, and Ni/ASA (ASA = amorphous silica alumina), with aim combining HDO single reaction step. While silica-supported catalysts were themselves hardly active upgrading, displayed comparable monomer yield as CuMgAlO . drawback...
Atomic Layer Deposition (ALD) of aluminium is a new method for enhancing acidity and acid catalytic activity in mesoporous zeolites hierarchical materials.
Metal nitrides are promising catalysts for depolymerisation of lignin in supercritical ethanol; cheap and abundant titanium nitride affords an aromatic monomer yield 19 wt% from soda lignin. The reaction mechanism is discussed on the basis products a guaiacol model compound study.
Pyrolysis (thermal anaerobic decomposition) of waste tyres is a sustainable recycling process. Its result an unstable liquid product – pyrolysis oil must be improved for economic usage. A complex microreactor system was developed upgrading/valorizing tyre oil. Following cleaning steps (distillation, resin removal, chemical preparation reactor) hydrogenated/hydrodesulfurized in the main reactor over NiMo/Al2O3 catalysts. Cheap self-made low active metal containing catalysts presented...
Pyridine adsorption monitored by FTIR spectroscopy revealed germanosilicate UTL type zeolite to contain intrinsic Brønsted acidity required for catalytic activity. Germanosilicate was converted into a bifunctional catalyst and evaluated in n-decane isomerization hydrocracking. To assess the stability of framework during preparation use, three different strategies converting were followed: incipient wetness impregnation with Pt(NH3)4Cl2 solution before after evacuation template calcination,...
Various commercial, homemade, and dealuminated mordenites (MOR) beta (BEA) zeolites as well cobalt modified BEAs have been characterized by 29Si- 27Al solid-state magic angle spinning nuclear magnetic resonance (MAS-NMR) spectroscopy. The quantitative contributions of Si(nAl) Si(OH)x sites to the NMR signal intensities were calculated from various Si/Al ratios relative 29Si assuming a special distribution aluminum in different periodical building units zeolite framework. A dealumination...