Sökning: "zsm-5"

Visar resultat 1 - 5 av 69 avhandlingar innehållade ordet zsm-5.

  1. 1. Crystallization of NBA-ZSM-5 from kaolin

    Författare :Wilson Aguilar-Mamani; Johanne Mouzon; Benoît Louis; Luleå tekniska universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; zeolite; ZSM-5; n-butylamine; crystal; raw materials; Chemical Technology; Kemisk teknologi;

    Sammanfattning : ZSM-5 is an aluminosilicate zeolite with high Si/Al ratio with suitable properties for catalysis, ion exchange, adsorption and membrane applications. The main goal of this thesis was to study the growth of ZSM-5 zeolite crystals from inexpensive natural sources of silica and alumina, as well as n-butylamine (NBA) as a low-cost structure directing agent. LÄS MER

  3. 2. NOx Adsorption and Transport in ZSM-5 Films

    Författare :Indra Perdana; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Wicke-Kallenbach cell; mathematical modelling; NOx adsorption and transport; adsorbed species; ZSM-5 films; permeation;

    Sammanfattning : The present work dealt with a fundamental study of NOx adsorption-desorption and transport in ZSM-5 as films supported on cordierite monolith and as a part of composite membranes. The adsorption-desorption study was focused on developing a mechanistic understanding of NOx adsorption in ZSM-5 films including the effects of counter-ions, Si/Al ratios and film thicknesses on the adsorption. LÄS MER

  4. 3. Preparation and characterization of collodial suspensions of ZSM-5 type zeolites

    Författare :Anders Persson; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; silicalite-1; redisperison; FTi.r.; monodisperse; ZSM-5; colloidal zeolite; 27< sup>A1 MAS n.m.r.; dynamic light scattering;

    Sammanfattning : .... LÄS MER

  5. 4. Studies of the influence of ZSM-5 synthesis on activity and stability of Cu-ZSM-5 in leand NOx reduction

    Författare :Malin Berggrund; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; HC-SCR; Cu-ZSM-5; catalysis; propene; lean NOx reduction; hydrothermal stability;

    Sammanfattning : The growing concern about the global warming coupled with the increasing emissions of the greenhouse gas carbon dioxide, combined with the climbing oil price, drives the interest to more fuel efficient lean combustion engines for automotive applications. Such engines require new technical solutions for reduction of NOx in the exhaust gases, which are in excess oxygen, where a conventional three-way catalyst cannot be used to reduce NOx. LÄS MER

  7. 5. NOx Adsorption in ZSM-5 Films - Experimental studies and mathematical modeling

    Författare :Indra Perdana; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; ZSM-5 films; NOx adsorption; adsorbed species; mathematical modeling.;

    Sammanfattning : This work dealt with studies of NOx adsorption in films of ZSM-5. The study was interesting due to its significant contribution to develop a detailed understanding of NOx transport and adsorption in ZSM-5 which is of interest for catalyst or membrane applications. LÄS MER