Sökning: "catalyst preparation"

Visar resultat 1 - 5 av 89 avhandlingar innehållade orden catalyst preparation.

  1. 1. Quantitative studies of changes in microstructure and activity during ageing of supported catalysts

    Författare :Torben Pingel; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; supported nanoparticle catalyst; scanning electron microscopy SEM ; quantitative; bimetallic catalyst; ageing properties; CO oxidation; FIB SEM; specimen preparation; particle size distribution PSD ; transmission electron microscopy TEM ;

    Sammanfattning : Catalytic converters have substantially contributed to the improvement of air quality in populated areas in the last decades by abatement of the emission of hazardous componentssuch as CO, unburned hydrocarbons and NOx. However, due to the exposure to high temperature and different components in the exhaust gas, the performance of the catalysts degrades with time. LÄS MER

  3. 2. High Bandgap FAPbBr3 Perovskite Solar Cells : Preparation, Characterization, and Application

    Författare :Yawen Liu; Erik Johansson; Tönu Pullerits; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; High-bandgap FAPbBr3; additives; defect passivation; dopant-free HTMs; 2D perovskites; carbon electrode; oxygen evolution; Chemistry with specialization in Physical Chemistry; Kemi med inriktning mot fysikalisk kemi;

    Sammanfattning : High bandgap lead-halide perovskite solar cells (PSCs) have gained interest as top cells for tandem solar cells and photoelectrochemical applications due to their suitable energy bands. However, the PSCs have limited stability and performance, and their fabrication in a glovebox and utilization of expensive metal contacts increase the cost and limit their application. LÄS MER

  4. 3. Immobilizing catalysts on textiles : case of zerovalent iron and glucose oxidase enzyme

    Författare :Mohammad Neaz Morshed; Vincent Nierstrasz; Frank Hollmann; Högskolan i Borås; []
    Nyckelord :Biocatalysts; Catalyst immobilization; Catalytic reduction; Chitosan; Dye removal; Environmental remediation; Enzyme immobilization; Glucose oxidase; Hyperbranched dendrimers; Heterogeneous catalysis; Heterogeneous bio-Fenton; Heterogeneous Fenton; Inorganic catalysts; Phenol removal; Polyester nonwoven fabric; Pathogenic bacteria removal; Plasma ecotechnology; Polyethylenimine; Textile catalyst; Textile biotechnology; Textile surface modification; Wastewater treatment; Zerovalent iron; 生物催化剂; 涤纶无纺布; 金属颗粒：铁固定化; 超支化树状大分子; 聚酰胺胺树状大分子 3-氨基丙基）; 三乙氧基硅烷; 1-硫代甘油; 聚乙烯胺; 壳聚糖; 葡萄糖氧化酶; 氧化还原酶; 酶固定化，物理吸附; 纤维催化剂; 多相催化; 抗菌纺织品; 革兰氏阳性（G ve）菌 革兰氏阴性（G-ve）菌; 类芬顿; 生物芬顿; 染料去除; 苯酚去除; 生物催化; 产业纺织品; 纺织生物技术; 纺织品表面改性; 环境治理; 废水处理; 零价铁。; Biocatalyseurs; Immobilisation de catalyseurs; Reduction de catalyseurs; Chitosane; Élimination de colorants; Assainissement de l’environnement; Immobilisation d’enzymes; Glucose oxydase; Dendrimères hyper-ramifiés; Catalyse hétérogène; Bio-Fenton hétérogène; Fenton hétérogène; Catalyseurs inorganiques; Élimination de phénols; Non-tissé Polyester; Élimination de bactéries pathogènes; Écotechnologie plasma; Polyéthylèneimine; Catalyseur textile; Biotechnologie textile; Modification de surface textile; Traitement des eaux usées; Fer zéro-valent; Biokatalysatorer; Katalysatorimmobilisering; Katalytisk reduktion; Kitosan; Avlägsnande av färgämnen; Miljösanering; Enzymimmobilisering; Glukosoxidas; Hypergrenade dendrimerer; Heterogen katalys; Heterogen bio-Fenton; Heterogen Fenton; Oorganiska katalysatorer; Fenolavlägsnande; Polyester fiberduk; Avlägsnande av patogena bakterier; Plasmaekoteknik; Polyetylenimin; Textil katalysator; Textil bioteknik; Modifiering av textilytor; Avloppsrening; Zerovalent järn; Textil och mode generell ; Textiles and Fashion General ;

    Sammanfattning : Catalytic systems are one of the most effective technologies of modern chemical processes. The system uses a molecule called ‘catalyst’ that is capable of catalyzing a reaction without being produced or consumed during the process. LÄS MER

  5. 4. Lean NOx reduction over silver-alumina catalysts - Aspects on synthesis, structure and activity

    Författare :Hannes Kannisto; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; freeze-drying; HC-SCR; DRIFTS.; aromatic hydrocarbons; silver-alumina; Lean NOx reduction; selective catalytic reduction; sol-gel; characterization; catalyst preparation; kinetic modeling;

    Sammanfattning : The aim of this thesis is to increase the understanding of how to design highly active silver-alumina catalysts for selective catalytic reduction of NOx with hydrocarbons (HC-SCR) in oxygen excess at low temperatures (150-250 °C). Silver-alumina catalysts have been prepared using different methods, including a new unique preparation method developed during the thesis project. LÄS MER

  7. 5. Catalytic combustion of methane

    Författare :Philippe Thevenin; KTH; []
    Nyckelord :catalytic combustion; gas turbine; methane; palladium; alumina; barium; lanthanum; oxidation; preparation; temperature-programmed oxidation TPO ; decomposition; reoxidation; X-ray photoelectron spectroscopy XPS ; metal-support interaction; deactiva;

    Sammanfattning : Catalytic combustion is an environmentally benign technologywhich has recently reached the stage of commercialization.Palladium is the catalyst of choice when considering gasturbines fuelled with natural gas because of its superioractivity for methane oxidation. LÄS MER