A Silicon Microreactor for Transient Spatially Resolved FTIR and Thermal Analysis of NOx Storage Reduction Catalysts and Reactors

CBET-0828852BaertschNOBXB存储还原（NSR）催化反应器目前正在开发作为后处理系统，以减少稀燃柴油发动机的NOBXB排放，以满足将于2007年和2010年实施的严格的EPA法规。基于瞬态非等温整体式反应器内基本反应动力学和详细传热传质的预测模型将为发动机制造商提供一种快速开发、优化和最终控制柴油发动机减排系统以满足这些苛刻法规的机制。复杂的，循环NSR系统的这种模型的开发需要实验研究和验证的瞬态和空间变化的动力学和热行为在一个整体后处理系统。然而，用于将催化剂表面表征技术和热测量能力结合到整料反应器几何形状中的方法是不可用的。在NSR循环期间，催化剂表面和反应器温度都作为时间和在整料中的位置的函数而变化，并且严格的预测模型需要捕获这些空间和时间现象。因此，这样的空间和时间的反应信息必须是可用的和可测量的实验模型验证和参数估计。PI的目标是利用为MEMS（微机电系统）开发的硅微制造技术带来的机会，开发一种新型的微反应器，用于表征动态NSR催化系统。将开发一个集成的微系统，以实现在NSR催化循环期间对高表面积纳米结构负载金属和氧化物催化剂的空间分辨和瞬态FTIR分析，同时对非等温NSR过程的空间分辨和瞬态温度测量，以及在几何形状内、在反应条件和时空下复制后处理整体式反应器。这项工作将直接影响普渡大学师生与康明斯公司研发团队之间的合作。致力于开发改进的发动机/催化剂系统，用于减少柴油发动机中的NOBXB，以满足即将到来的EPA标准。更广泛的影响通过这项工作，将催化剂表面表征技术（特别是在高温下的原位FTIR）和热测量能力纳入整体和填充床反应器的几何形状，以改进催化剂的设计和分析的新能力将被开发。此外，PI正在努力招募，保留和支持妇女和少数民族学生通过工程项目中的妇女，指导关系和K-12外展计划，包括普渡EDGE夏令营将继续进行。工程教学资源将由本科生以MEMS学习模块的形式开发，并在NSF资助的nanoHUB（HTUwww.nano.orgUTH）上传播，作为其在线纳米电子课程的一部分。

CBET-0828852BaertschNOBXB storage reduction (NSR) catalytic reactors are currently being developed as after treatment systems to reduce NOBXB emissions from lean burn diesel engines to meet stringent EPA regulations to be imposed in 2007 and 2010. Predictive models based on fundamental reaction kinetics and detailed heat and mass transfer within transient non-isothermal monolithic reactors will provide a mechanism for engine manufacturers to rapidly develop, optimize, and ultimately control diesel engine emission reduction systems to meet these demanding regulations. Development of such models for complex, cyclic NSR systems requires experimental investigation and validation of transient and spatially variant kinetic and thermal behavior within a monolith after-treatment system. However, methods for incorporating catalyst surface characterization techniques and thermal measurement capabilities into monolith reactor geometries are not available. Both the catalyst surface and the reactor temperature vary as a function of time and position in the monolith during NSR cycles, and a rigorous predictive model needs to capture these spatial and temporal phenomena. Thus, such spatial and temporal reaction information must be available and measurable experimentally for model validation and parameter estimation. Intellectual Merit The PI aims to take advantage of opportunities emerging from silicon microfabrication technologies developed for MEMS (micro-electro-mechanical systems) to develop a novel microreactor for the characterization of dynamic NSR catalytic systems. An integrated microsystem will be developed to enable combined Uspatially resolved and transient FTIR analysis Uof high-surface area nanostructured supported metallic and oxide catalysts during NSR catalytic cycles, simultaneously with Uspatially resolved and transient temperature measurementsU of the non-isothermal NSR process and Uwithin a geometry and at reaction conditions and space times replicating after-treatment monolith reactorsU. This work will directly impact a collaboration between faculty and students at Purdue University and a research and development team at Cummins Inc. working to develop improved engine/catalyst systems for reducing NOBXB from diesel engines to meet impending EPA standards. Broader Impact Through this work new capabilities for incorporating catalyst surface characterization techniques (specifically in-situ FTIR at elevated temperatures) and thermal measurement capabilities into monolith and packed-bed reactor geometries for improved catalyst design and analysis will be developed. Additionally, on-going efforts by the PI to recruit, retain, and support women and minority students in engineering through the Women in Engineering Program, mentoring relationships, and K-12 outreach programs including the Purdue EDGE summer camp will continue. Engineering teaching resources will be developed by undergraduate students in the form of MEMS learning modules and disseminated on the NSF funded nanoHUB (HTUwww.nano.orgUTH) as part of its on-line nanoelectronics curriculum.