A5055963458- Advanced Cellulose Research Studies
- Biofuel production and bioconversion
- Lignin and Wood Chemistry
- X-ray Diffraction in Crystallography
- Catalysis for Biomass Conversion
- Crystallization and Solubility Studies
- Enzyme-mediated dye degradation
- Oxidative Organic Chemistry Reactions
- Ionic liquids properties and applications
- biodegradable polymer synthesis and properties
- Nanocomposite Films for Food Packaging
- Catalysis and Oxidation Reactions
- Catalysis and Hydrodesulfurization Studies
- Chemical Synthesis and Reactions
- Polyoxometalates: Synthesis and Applications
- Radical Photochemical Reactions
- Cultural Heritage Materials Analysis
- Synthesis and Catalytic Reactions
University of Helsinki
2012-2020
Kemerovo Cardiology Center
2016
Abstract Different acid–base conjugates were made by combining a range of bases and superbases with acetic propionic acid. Only the combinations that contained capable dissolving cellulose. Proton affinities calculated for bases. A range, within which cellulose dissolution occurred, when combined or acid, was defined further use. This above proton affinity value about 240 kcal mol −1 at MP2/6‐311+G(d,p)//MP2/ 6‐311+G(d,p) ab initio level. Understanding allowed us to determine cation acidity...
A laboratory batch simulation of the recovery and reuse [DBNH][OAc] in IONCELL-F process, yielding future directions for optimising recycling process.
Novel methods for the fractionation of wood, as a major renewable chemical and material feedstock, are in demand. Ionic liquids, such 1-ethyl-3-methylimidazolium acetate ([emim][OAc]), promoted potential media these processes. However, stabilities ionic liquids question they may have an effect on process sustainability or efficiency. With anion nucleophilicity basicity being implicated more liquid reactivity, rough scale relative reactivities [emim]-based is demonstrated, based upon their...
Hydrophobic, long-chain tetraalkylphosphonium acetate salts (ionic liquids) were combined with DMSO and the feasibility of these solvent systems for cellulose dissolution regeneration was studied.
Norway spruce wood was mechanically pulverized to varying degrees. The solubility of the samples, in a range common ionic and molecular solvents, quantified using novel 31P NMR technique. results show that intact is not soluble under mild treatment conditions, cellulose-dissolving or swelling solvents.
Autohydrolysis, an economical pre-treatment, allows for dissolution and chemical modification of wood chips.
Pretreatment with ionic liquids (ILs) is known to greatly increase the subsequent biomass hydrolysis enzymes. However, presence of even low amounts ILs has negative effects on cellulase action. Most studies inactivation by have focused imidazolium-based ILs, which until recently were one few IL classes dissolve cellulose. In this article we describe results action in matrices containing belonging two reported as cellulose solvents. These are based organic superbases...
Abstract A method for aerobic alcohol oxidation catalysed by Fe(NO 3 ) /2,2’‐bipyridine/TEMPO has allowed highly selective conversion of primary alcohols into either aldehydes or carboxylic acids in one‐step. The proceeded selectively to aldehydes, as TEMPO was present the reaction. Nevertheless, were further oxidized reaction time extended. Detailed investigation suggested, that deoxygenation TMP enabled auto‐oxidation acids, which initially inhibited presence TEMPO. procedure also...
Abstract A homogeneous Mn(NO 3 ) 2 /2,2,6,6‐tetramethylpiperidin‐1‐yl)oxyl/2‐picolinic acid catalyst system is highly active and versatile for the selective aerobic oxidation of alcohols (2,2,6,6‐tetramethylpiperidin‐1‐yl)oxyl=TEMPO, 2‐picolinic acid=PyCOOH). The catalytic method enables near quantitative conversion various primary to respective aldehydes using a very simple reaction setup workup. This study presents findings on stability mechanisms deactivation. results show that NO − plays...
Abstract A highly efficient, ligand‐enhanced 2,2,6,6‐tetramethylpiperidine‐1‐oxy (TEMPO)/Mn(NO 3 ) 2 catalyst system for the aerobic oxidation of alcohols is described. From series coordinating ligands studied herein, 2‐picolinic acid (PyCOOH) improves catalytic activity TEMPO/Mn(NO remarkably. Under ambient air at room temperature in acetic acid, converts aliphatic and benzylic primary that bear various functional groups into their respective aldehydes with near quantitative conversions....
Herein, we report an efficient transition metal triflate catalyzed approach to convert biomass-based compounds, such as monoterpene alcohols, sugar octyl acetate and tea tree oil, their corresponding olefins in high yields. The reaction proceeds through C-O bond cleavage under solvent-free conditions, where the catalytic activity is determined by oxophilicity Lewis acidity of catalyst. In addition, demonstrate how oxygen containing functionality affects formation olefins. Furthermore,...
Abstract BACKGROUND This study elaborates the possibility to apply combined ionic liquid (IL) and enzyme treatments for pulp fibre modification. The approach involves swelling of surfaces with IL followed by enzymatic modification disrupted surface using carbohydrate active enzymes. RESULTS capacity seven cellulose‐dissolving or cellulose‐swelling liquids swell fibres was compared. In addition, thirteen cellulases five xylanases were screened their tolerance, which determines applicability...