Sökning: "homogenous catalysis"

Visar resultat 1 - 5 av 14 avhandlingar innehållade orden homogenous catalysis.

1. 1. Efficiency and Selectivity in the Chlorate Process

   Författare :Aleksandra Lindberg; Ann Cornell; Susanne Holmin; Eva Blomberg; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; electrolysis; chlorate process; anodes; cathodes; selectivity; chromate; chromium VI ; DSA; HER; OER; ClER; oxygen; chlorate; hypochlorite; electrocatalysis; catalysis; Chemical Engineering; Kemiteknik;

   Sammanfattning : This licentiate thesis presents experimental studies concerning two parts of the electrochemical cell in the chlorate process: a cathode and an anode.Newly synthesized MnOx electrodes were investigated for the cathodic reaction, hydrogen evolution reaction (HER) in the chlorate process. LÄS MER

3. 2. Selectivity and gas composition in electrochemical systems by mass spectrometry

   Författare :Aleksandra Lindberg; Göran Lindbergh; Ann M. Cornell; Susanne Holmin; Thijs de Groot; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; electrolysis; chlorate; selectivity; chromate; DSA; HER; OER; hypochlorite; ClER; catalysis; gases; NiMH battery; електролиза; хлорат; селективност; хромат; ДСА; реакција издвајања водоника; еволуција кисеоника; хипохлорат; еволуција хлора; катализа; гасови; NiMH батерије; elektrolys; klorat; selektivitet; kromat; DSA; vätgasutvecklingsreaktion; syrgasutvecklingsreaktion; hypoklorit; klorgasutvecklingsreaktion; katalys; gaser; NiMH batteri; Chemical Engineering; Kemiteknik;

   Sammanfattning : This doctoral thesis presents experimental studies of gaseous products of two electrochemical systems: the chlorate process and the nickel-metal hydride (NiMH) battery, employing mass spectrometry.The cathodic efficiency for the hydrogen evolution reaction (HER) of the chlorate process was investigated by employing ex-situ synthesized MnOx electrodes. LÄS MER

4. 3. Iron catalyzed C-C coupling reactions - mechanistic investigations

   Författare :Anna Hedström; Göteborgs universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; iron; homogenous catalysis; cross coupling; C-C bond formation; reaction mechanisms; kinetic investigations; competitive Hammett study; density functional theory;

   Sammanfattning : The mechanism of the iron catalyzed cross coupling of aryl electrophiles with alkyl Grignard reagents was studied. The reaction proceeds via a rate-limiting oxidative addition of the aryl halide to an Fe(I) complex generated in situ. A transmetalation from an aryl Grignard reagent occurs either before or after the oxidative addition. LÄS MER

5. 4. Studies on Palladium-Catalyzed Carbocyclizations of Allene-Substituted Olefins and 1,3-Dienes

   Författare :Katja Närhi; Jan-Erling Bäckvall; Giovanni Poli; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Organometallic Chemistry; Homogenous Catalysis; Palladium; Allenes; C-C bond formation; Organic chemistry; Organisk kemi;

   Sammanfattning : This thesis describes the development and mechanistic studies of carbocyclization reactions of allene-substituted olefins and 1,3-dienes, catalyzed by palladium(0) and palladium(II). These reactions results in the formation of [n,3,0] bicyclic systems (n = 3-5) with high stereoselectivity and in good to excellent yields. LÄS MER

7. 5. Development of Palladium-Catalyzed Transformations Involving η1-Allypalladium Species

   Författare :Niclas Solin; Kálmán Szabó; Antonio M. Echavarren; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Palladium; Homogenous catalysis; Allylation; Electrophilic substitution; Density functional calculations; Organic chemistry; Organisk kemi;

   Sammanfattning : This thesis is focused on investigation of the structure, reactivity and isomerization reactions of η1-allylpalladium complexes, which are key intermediates in catalytic transformations. The first part of this thesis concerns the structure and reactivity of bis-allylpalladium complexes. LÄS MER