A Novel Catalyst Geometry for Automobile Emission Control

Pereira, Candido; Kim, G.; Hegedus, L. Louis

doi:10.1080/01614948408064724

Cited by 8 publications

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

Aluminum Oxide (Alumina), Activated

Pearson

2000

Kirk-Othmer Encyclopedia of Chemical Technology

View full text Add to dashboard Cite

The activated aluminas comprise a series of nonequilibrium forms of partially hydroxylated aluminum oxide, Al 2 O 3 . The chemical composition can be represented by \documentclass{article}\usepackage{amssymb}\pagestyle{empty}\begin{document}${{\rm{Al}}{_{2}}{\rm{O}}_{{(}3-x{)}}}$\end{document} (OH) 2 x where x ranges from about 0 to 0.8. They are porous solids made by thermal treatment of aluminum hydroxide precursors and find application mainly as adsorbents, catalysts, and catalyst supports. Activated alumina, for purposes of this discussion, refers to thermal decomposition products (excluding α‐alumina) of aluminum trihydroxides, oxide hydroxides, and nonstoichiometric gelatinous hydroxides. The term “activation” is used to indicate a change in properties resulting from heating (calcining). In general, as a hydrous alumina precursor is heated, hydroxyl groups are driven off, leaving a porous solid structure of activated alumina. The physical properties of the material are set by the choice of precursor, the forming process, and the activation conditions. Activated alumina is a relatively innocuous material from a health and safety standpoint. It is nonflammable and nontoxic. Normal precautions associated with handling of nuisance dusts should be taken. Activated alumina is normally shipped in moisture‐proof containers because of its strong desiccating action.

show abstract

Aluminum Oxide (Alumina), Activated

Pearson

2000

Kirk-Othmer Encyclopedia of Chemical Technology

View full text Add to dashboard Cite

show abstract

Aluminum Oxide (Alumina), Activated

Pearson

2003

Kirk-Othmer Encyclopedia of Chemical Technology

View full text Add to dashboard Cite

The activated aluminas comprise a series of nonequilibrium forms of partially hydroxylated aluminum oxide, Al 2 O 3 . The chemical composition can be represented by \documentclass{article}\usepackage{amssymb}\pagestyle{empty}\begin{document}${{\rm{Al}}{_{2}}{\rm{O}} _{{(}3-x{)}}}$\end{document} (OH) 2 x where x ranges from about 0 to 0.8. They are porous solids made by thermal treatment of aluminum hydroxide precursors and find application mainly as adsorbents, catalysts, and catalyst supports. Activated alumina, for purposes of this discussion, refers to thermal decomposition products (excluding α‐alumina) of aluminum trihydroxides, oxide hydroxides, and nonstoichiometric gelatinous hydroxides. The term “activation” is used to indicate a change in properties resulting from heating (calcining). In general, as a hydrous alumina precursor is heated, hydroxyl groups are driven off, leaving a porous solid structure of activated alumina. The physical properties of the material are set by the choice of precursor, the forming process, and the activation conditions. Activated alumina is a relatively innocuous material from a health and safety standpoint. It is nonflammable and nontoxic. Normal precautions associated with handling of nuisance dusts should be taken. Activated alumina is normally shipped in moisture‐proof containers because of its strong desiccating action.

show abstract