Sökning: "catalysis"

Visar resultat 21 - 25 av 92 uppsatser innehållade ordet catalysis.

  1. 21. Evolutionary History of Nickel-Dependent Enzymes : Implications for the Origins of Life.

    Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning; Uppsala universitet/Paleobiologi

    Författare :Reem Hallak; [2021]
    Nyckelord :nickel; enzymes; redox; origin of life; LUCA; ancestral reconstruction; phylogeny; phyletic patterns;

    Sammanfattning : Nickel enzymes have been suggested, through numerous phylogenetic studies, to have been among the very first catalytic compounds on the early Earth, possibly present in the last universal common ancestor (LUCA) or prior to the onset of life. This is because of the type of reactions catalyzed by some of these enzymes, the nature of organisms that utilize them, their distribution in the tree of life, and their key roles in what is now thought of as possibly one of the oldest carbon fixation pathways, the Wood-Ljungdahl (WL) pathway. LÄS MER

  3. 22. Tuning the composition of metallic nanoparticles for catalytic applications

    Master-uppsats, KTH/Kemi

    Författare :Anthony Ropp; [2021]
    Nyckelord :catalysis; nanoparticles; frustrated Lewis pairs; synthesis; core-shell;

    Sammanfattning : Industries’ interest in nanomaterials is tremendous and catalysis is one of their applications. Catalysts allow reactions to occur under milder conditions, avoiding committing excessive heat or pressure to foster reactions. LÄS MER

  4. 23. Partial hydrodeoxygenation of a heavy bio-based oil fraction : (A technical feasibility study)

    Master-uppsats, KTH/Kemiteknik

    Författare :Akshay Menon; [2020]
    Nyckelord :Hydrodeoxygenation; Tall oil pitch; oxygen removal; sulphidation; catalyst;

    Sammanfattning : This report is intended to provide the reader with an extensive background information on hydrode oxygenation (HDO) of Tall Oil Pitch (TOP), combined with results from chemical property analyses of the same. Firstly, the importance of hydrogenation and oxygen removal for a biomass-based feed material is highlighted. LÄS MER

  5. 24. Environmental transformations of Manganese and Manganese oxide nanoparticles

    Master-uppsats, KTH/Materialvetenskap

    Författare :Lundberg Annie; [2020]
    Nyckelord :;

    Sammanfattning : Engineered nanoparticles (NPs) are produced in increased quantities. Due to this increase, itis vital to understand the full lifecycle and fate of these NPs to prevent any possible environmental stress. LÄS MER

  7. 25. Molecular linking towards direct plasmonic transparent solar cell

    Master-uppsats, Uppsala universitet/Institutionen för kemi - Ångström

    Författare :Thinh Nguyen Luong The; [2020]
    Nyckelord :pABA; plasmonic; plasmon; solar; cell; Ag; silver; self; assembly; citrate;

    Sammanfattning : Plasmonic materials have been studied extensively in the last decade for applications in photonics, solar energy utilization and catalysis. The introduction of molecular linker bridging metal particles and oxide semiconductor has been proven to prolong the lifetime of short-lived hot carriers and prevent issues from ohmic contact. LÄS MER