Process for producing metal oxide particle and exhaust gas...

B - Operations – Transporting – 01 – J

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B01J 37/03 (2006.01) B01D 53/94 (2006.01) B01J 23/10 (2006.01) B01J 23/63 (2006.01)

Patent

CA 2562556

The present invention provides an exhaust gas purifying catalyst and a process for producing a metal oxide particle comprising multiple species of metal oxides and capable of satisfactorily exerting the properties of respective metal oxides. A process of the present invention comprises providing a sol containing at least a population of first colloid particles and a population of second colloid particles differing in the isoelectric point with each other; adjusting the pH of the sol to be closer to the isoelectric point of the population of first colloid particles than to the isoelectric point of the population of second colloid particles, thereby aggregating the population of first colloid particles; adjusting the pH of the sol, thereby aggregating the population of second colloid particles onto the population of first colloid particles aggregated; and drying and firing the obtained aggregate.

La présente invention propose un catalyseur de purification des gaz d~évacuation et un processus de production d~une particule d~oxyde métallique comprenant de multiples espèces d~oxydes métalliques et capable d~exercer de manière satisfaisante les propriétés des oxydes métalliques respectifs. Un processus de la présente invention comprend la fourniture d~un sol contenant au moins une population de premières particules colloïdales et une population de deuxièmes particules colloïdales dont le point isoélectrique est différent de l'une à l'autre ; l~ajustement du pH du sol à une valeur plus proche du point isoélectrique de la population des premières particules colloïdales que le point isoélectrique de la population des deuxièmes particules colloïdales, en agrégeant ainsi la population des premières particules colloïdales ; l~ajustement du pH du sol, en agrégeant ainsi la population des deuxièmes particules colloïdales sur la population des premières particules colloïdales agrégées ; et le séchage et le chauffage de l~agrégat obtenu.

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