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DESIGN AND DEVELOPMENT OF NOVEL CATALYTIC PROCESS UTILIZING ZEOLITE

新型沸石催化工艺的设计与开发

基本信息

批准号：
03453079
负责人：
IWAMOTO Masakazu
金额：
$ 4.67万
依托单位：
HOKKAIDO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1992
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-03453079/
关键词：
ZEOLITE METAL ION EXCHANGE AMINATION NITROGEN MONOXIDE ACTIVE SITE

项目摘要

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

1.为开发变压吸附脱除低浓度NO的系统，研究了不同金属交换沸石对NO的吸附性能。对于MFI沸石，每单位重量吸附剂的NO可逆吸附量随金属离子按以下顺序变化很大：过渡金属离子（[SY]）= 0.00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000碱土金属离子>稀土金属离子[）质子。Cu-和Ag-MFI分子筛对NO的可逆吸附量最大，Co-MFI分子筛对NO的不可逆吸附量最大。NO在Cu-MFI和Ag-MFI分子筛上的可逆和不可逆吸附量均随分子筛中Cu或Ag离子含量的增加而增加.在具有5.6 - 50的宽范围的二氧化硅/氧化铝比的各种沸石催化剂上研究2-甲基丙烯和氨之间的反应。高温下催化活性随Bronsted酸中心数量的平行变化， ...更多信息 Na ^+取代H-MFI-40中的H ^+或二异丙胺的预吸附均使催化剂活性显著降低，表明Bronsted酸位发生了胺化反应，催化剂活性对硅铝比的依赖性表明疏水性、分子筛结构和Brphinsted酸性是控制2-甲基丙烯与氨反应的因素.最近在铜离子交换ZSM-5沸石（Cu-ZSM-5）上发现了在氧和二氧化硫存在下烃对一氧化氮的选择性催化还原。该反应甚至在氧化气氛中在低至573K的温度下进行。为了实现一氧化氮的选择性还原，向反应物流中加入氧气是必要的。烃类浓度的增加增加了氮的转化率，扩大了反应的活性温区。结果表明，Cu-ZSM-5是一种很有潜力的稀燃汽油和柴油发动机催化剂。少