Online NMR measurements are introduced in the current study as a new analytical setup for investigation of the oxymethylene dimethyl ether (OME) synthesis. For the validation of the setup, the newly established method is compared with state-of-the-art gas chromatographic analysis. Afterwards, the influence of different parameters, such as temperature, catalyst concentration and catalyst type on the OME fuel formation based on trioxane and dimethoxymethane is investigated. As catalysts, Amberlyst 15 (A15) and trifluoromethanesulfonic acid (TfOH) are utilized. A kinetic model is applied to describe the reaction in more detail. Based on these results, the activation energy (A15: 48.0 kJ mol and TfOH: 72.3 kJ mol ) and the order in catalyst (A15: 1.1 and TfOH: 1.3) are calculated and discussed.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1002/chem.202203776 | DOI Listing |
J Phys Chem A
December 2024
Chair of High Pressure Gas Dynamics, Shock Wave Laboratory, RWTH Aachen University, Aachen 52056, Germany.
In the search for alternative energy carriers that can replace conventional fossil fuels, sustainably produced oxygenated hydrocarbons represent a promising class of potential candidates. An illustrative member of this class of alternative biofuels are oxymethylene ethers (OMEs). This study makes a contribution to this objective by investigating hydroxy ethers, specifically methoxymethanol, ethoxymethanol, and 2-methoxyethanol.
View Article and Find Full Text PDFAnaesth Crit Care Pain Med
December 2024
Department of Anesthesiology and Perioperative Medicine, David Geffen School of Medicine, University of California Los Angeles, California, United States. Electronic address:
Int J Biol Macromol
November 2024
Xiamen Key Laboratory of Clean and High-valued Utilization for Biomass, College of Energy, Xiamen University, Xiamen 361102, China; Fujian Engineering and Research Center of Clean and High-valued Technologies for Biomass, College of Energy, Xiamen University, China, 361102, China. Electronic address:
Cooking with active oxygen and solid alkali (CAOSA) is an efficient pretreatment method for biomass. For better grading of the lignin yellow liquor, the different lignin fractions and the recovered solid alkali were obtained using a simultaneous acid-alkali graded separation method. The results indicated that the recovery rate of solid alkali was 67.
View Article and Find Full Text PDFChemistry
August 2024
Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstr. 10, 07743, Jena, Germany.
The urgent need for sustainable alternatives to fossil fuels in the transportation sector is driving research into novel energy carriers that can meet the high energy density requirements of heavy-duty vehicles without exacerbating the climate change. This concept article examines the synthesis, mechanisms, and challenges associated with oxymethylene ethers (OMEs), a promising class of synthetic fuels potentially derived from carbon dioxide and hydrogen. We highlight the importance of OMEs in the transition towards non-fossil energy sources due to their compatibility with the existing Diesel infrastructure and their cleaner combustion profile.
View Article and Find Full Text PDFRSC Adv
June 2024
Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba Haya de La Torre y Medina Allende, Ciudad Universitaria X5000HUA Córdoba Argentina
In the present work, derivatives of phenanthridine-6(5)-ones and benzo[]chromenes were efficiently prepared through an intramolecular C-H bond functionalization reaction catalyzed by photochemically synthesized Pd-PVP nanoparticles. The heterocycles were obtained intramolecular arylation of the corresponding -methyl--aryl-2-halobenzamide or aryl-(2-halo)benzyl ethers using KCO as base in a mixture of HO : DMA as solvent without additives or ligands. High yields of the heterocyclic compounds were achieved (up to 95%) using a moderately low catalyst loading (1-5 mol%) under an air atmosphere at 100 °C.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!