High Activity Catalytic Redox Sites Within Zeolites

沸石内的高活性催化氧化还原位点

基本信息

批准号：
0099359
负责人：
Carl Lund
金额：
$ 24.32万
依托单位：
SUNY at Buffalo
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2001
资助国家：
美国
起止时间：
2001-06-01 至 2004-11-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=0099359&HistoricalAwards=false
关键词：
Activity Catalytic Redox Sites Within

项目摘要

Proposal Title: High Activity Catalytic Redox Sites within ZeolitesProposal Number: CTS-0099359Principal Investigator: Carl LundInstitution: State University of New York at BuffaloThe objective of this proposal is to determine the chemical nature of high activity redox sites on zeolite catalysts. In previous work the PI postulated the novel hypothesis that the anions, rather than the cations, were involved the redox activity. A kinetic model involving nitrate and nitrite species was proposed to explain anomalous behavior above a certain partial pressure of reactant. Specifically, it was found that the rate of decomposition of nitrous oxide over a zeolite catalyst jumped to a higher level when its partial pressure exceeded a critical value. Because this phenomenon only occurred when the zeolite had been ion-exchange with iron, there is some interaction with the cation. The proposed research may reveal a new type of redox chemistry, which may be applied to the decomposition of NOx compounds as well as partial oxidation reactions. The use of gravimetry, infrared spectroscopy, microcalorimetry, isotope-labeling studies, and detailed kinetic studies may reveal the nature and identity of the high activity redox sites. This work has the potential to elucidate phenomena important in industrial and environmental applications including the selective catalytic reduction of nitrogen oxides.

提案标题：高活性催化氧化还原地点数量：CTS-0099359原理研究者：Carl Lundinstitution：该提议的Buffalothe纽约州立大学的目标是确定Zeolite催化剂上高活动性氧化还原地点的化学性质。在先前的工作中，PI假定了新的假设，即阴离子而不是阳离子涉及氧化还原活性。提出了一种涉及硝酸盐和亚硝酸盐物质的动力学模型，以解释反应物特定部分压力的异常行为。具体而言，发现当沸石催化剂上的一氧化二氮的分解速率在其二压超过临界值时跳至较高水平。因为这种现象仅在沸石与铁与离子交换时发生，所以与阳离子有一定的相互作用。拟议的研究可能揭示了一种新型的氧化还原化学，可以应用于NOX化合物的分解以及部分氧化反应。使用重量表，红外光谱，微量钙化，同位素标记研究和详细的动力学研究可能揭示了高活性氧化还原位点的性质和身份。这项工作有可能阐明在工业和环境应用中重要的现象，包括选择性催化氮氧化物。