Sökning: "catalysis"

Visar resultat 1 - 5 av 66 uppsatser innehållade ordet catalysis.

  1. 1. 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

  2. 2. Vidareutveckling av katalysatorer för pre-reforming i bränslecellssystem

    Master-uppsats, Lunds universitet/Kemiteknik (CI)

    Författare :Alexander Schönauer; [2020]
    Nyckelord :catalysis; pre-reforming; fuel cells; SOFC; DMSOFC; heterogeneous catalysts; propane reforming; chemical engineering; kemiteknik; Technology and Engineering;

    Sammanfattning : Heterogeneous catalysts to be used in a pre-reformer for fuel cell systems have been investigated based on active phase composition and catalyst preparation methods for granulate and monolithic catalysts. The catalysts were manufactured using θ – aluminum oxide as carrier, promoted with lanthanum and cerium, with active phases consisting of noble metal X and nickel in various concentrations. LÄS MER

  3. 3. Skillnad i reaktivitet mellan olika cellulosaråvaror vid framställningen av cellulosaacetat

    Master-uppsats, Karlstads universitet

    Författare :Karl-Petter Bengtsson; [2020]
    Nyckelord :cellulosa cellulosaacetat utbyte;

    Sammanfattning : Detta arbetes syfte är att utveckla en metod som konsekvent kan hitta skillnader mellan olika cellulosaråvarors reaktivt vid syntetiseringen av cellulosaacetat med ättiksyraprocessen.  Detta undersöktes genom att förändra reaktionsparameterna mängd adderad svavelsyrakatalysator och temperatur. LÄS MER

  4. 4. A model for heterogenic catalytic conversion of carbon dioxide to methanol

    Kandidat-uppsats, Linköpings universitet/Institutionen för fysik, kemi och biologi

    Författare :Elin Johannesson; [2020]
    Nyckelord :Carbon dioxide; methanol; heterogeneous catalysis; zinc oxide; computational chemistry; density functional theory;

    Sammanfattning : Since our society became industrialised, the levels of carbon dioxide in our atmosphere have been steadily rising, to the point where it in early 2020 at is 413 ppm. The high concentration is causing several troubling effects worldwide because of the increase in mean temperature that it creates, which causes longer draughts, more severe floods, and rising seawater levels to name a few. LÄS MER

  5. 5. Trifluoromethoxylation of Allylic Alcohols via 1,2-Aryl Migration Promoted by Visible Light-Mediated Photoredox Catalysis

    Uppsats för yrkesexamina på grundnivå, KTH/Skolan för kemi, bioteknologi och hälsa (CBH)

    Författare :Shuai Qiu; [2020]
    Nyckelord :Photoredox Catalysis; Fluorination; Trifluoromethoxylation; tvisible light; allylic alcohols; fotoredoxkatalys; trifluorometoxylering; synligt ljus; allyliska alkoholer;

    Sammanfattning : Visible light photoredox catalysis has proven to be a powerful tool for promoting transformations in organic synthesis. Hence this project was carried out to develop tools for predicting reactivity patterns of visible light- promoted redox reactions. Fluorination is of immense importance in organic chemistry, and so is trifluoromethoxylation. LÄS MER