Essays about: "hydrogen formation"

Showing result 21 - 25 of 52 essays containing the words hydrogen formation.

1. 21. Catalytic hydrotreating of lignin

   University essay from Lunds universitet/Kemiteknik (CI)

   Author : Markus Lilja; [2019]
   Keywords : Lignin; hydrotreating; kemiteknik; chemical engineering; Chemistry; Technology and Engineering;

   Abstract : One of the main challenge’s society faces today is climate change caused by CO2 due to the de-pendence on fossil fuels. To combat the increasing CO2 levels there is a need to develop renewable fuels. One such fuel could potentially be derived from lignin. In this thesis, lignin derived from a pulp and paper mill was first treated and cleaned. READ MORE

3. 22. Investigating Gas Turbulence in Galactic Discs

   University essay from Lunds universitet/Astronomi - Genomgår omorganisation

   Author : Timmy Ejdetjärn; [2019]
   Keywords : galaxies; gas; turbulence; interstellar medium; star formation; feedback; gravitational instability; local; high redshift; Physics and Astronomy;

   Abstract : The interstellar medium of both local and distant disc galaxies is observed to be supersonically turbulent and the turbulent motion of the gas is thought to be important for galaxy formation and evolution, particularly as a key ingredient for star formation. Consequently, this generates a striking relation between the star formation rate (SFR) and gas velocity dispersion ($\sigma_{\rm g}$; a measurement on the level of turbulence). READ MORE

4. 23. Fabrication and Evaluation of Perovskite LaCrO3 Nanoparticles as Catalyst for Electrochemical Ammonia Synthesis

   University essay from Lunds universitet/Institutionen för energivetenskaper

   Author : Mathilda Ohrelius; [2019]
   Keywords : nitrogen reduction reaction; electrochemical ammonia synthesis; catalyst; perovskite; LaCrO3; fuel cell; renewable energy; Science General;

   Abstract : As our way of living exploits the resources of the earth and our energy use keeps on increasing, we are now facing a climate crisis never seen before in modern time. To face these consequences and try to ease the harm we need to transform our extraction and use of energy. READ MORE

5. 24. The impact of turbulence on supernovae shockwaves

   University essay from Lunds universitet/Astronomi - Genomgår omorganisation

   Author : Loke Lönnblad Ohlin; [2018]
   Keywords : astrophysics; astronomy; supernovae; shockwaves; interstellar medium; massive stars; turbulence; molecular clouds; Physics and Astronomy;

   Abstract : The momentum and energy injection from supernovae is one of the main feedback modes, and is therefore key to the understanding of galaxy evolution and star formation. However, due to low resolution, large scale galaxy simulations often have issues with accurately modelling supernovae, and therefore rely on sub-grid models. READ MORE

6. 25. A novel manganese cofactor : Elucidation and characterization of a high-valent manganese cofactor in ribonucleotide reductase using Electron Paramagnetic Resonance spectroscopy

   University essay from Uppsala universitet/Molekylär biomimetik

   Author : Sigrid Berglund; [2018]
   Keywords : ;

   Abstract : The in-biology novel high-valent manganese cofactor {MnIII MnIV} has been elucidated and characterized in a ribonucleotide reductase from Facklamia ignava, establishing the new radical-free ribonucleotide reductase class; class Id. The cofactor was found to be directly connected to catalytic activity and a mixed-metal cofactor was disproven using a newly formulated in vitro assembly protocol and activity assays. READ MORE