DESIGN AND DEVELOPMENT OF NOVEL CATALYTIC PROCESS UTILIZING ZEOLITE

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1. NO adsorption properties of various metal exchanged zeolites were studied to develop the system for removal of low concentration of NO by using pressure swing adsorption. With MFI zeolite, the amounts of reversible adsorption of NO per weight of adsorbent much changed with metal ion in the following order; transition metal ion(] SY.apprxeq.[)alkaline earth metal ion>rare earth metal ion(] SY.apprxeq.[)proton. The amounts of reversible adsorption of NO on Cu- or Ag-MFI zeolites were the largest while that of irreversible NO adsorption was the greatest on Co-MFI zeolite. The amount of reversible and irreversible adsorption of NO on Cu-or Ag-MFI zeolites increased in proportion to the amount of Cu or Ag ion in MFI zeolite.2. The reaction between 2-methylpropene and ammonia was investigated over various zeolite catalysts having a wide range of silica/alumina ratio of 5.6-50. A parallel change of the catalytic activity with the amount of Bronsted acid site at elevated temperatures and th … More e significant decrease of the activity by the Na^+ substitution of H^+ in H-MFI-40 or by the preadsorption of diisopropylamine showed the amination on Bronsted acid site.The dependence of the catalytic activity on silica/alumina ratio suggested that hydrophobicity and zeolite structure as well as Brphinsted acidity are factors controlling the reaction between 2-methylpropene and ammonia.3. Selective catalytic reduction of nitrogen monoxide by hydrocarbon in the presence of oxygen and sulphur dioxide has very recently been found on copper ion-exchanged ZSM-5 zeolite (Cu- ZSM-5). The reaction proceeds even in the oxidizing atmosphere at temperatures as low as 573K. Addition of oxygen to the reactant stream is necessary is achieve the selective reduction of nitrogen monoxide. The increment of concentration of hydrocarbon increased the conversion into nitrogen and expanded the active temperature region. It was concluded that Cu-ZSM-5 is suggested as one of the strong candidates for catalysts applicable to lean-burn gasoline and diesel engines. Less