• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>Sensors (Basel Switzerland) >Correlating the Integral Sensing Properties of Zeolites with Molecular Processes by Combining Broadband Impedance and DRIFT Spectroscopy—A New Approach for Bridging the Scales
【2h】

Correlating the Integral Sensing Properties of Zeolites with Molecular Processes by Combining Broadband Impedance and DRIFT Spectroscopy—A New Approach for Bridging the Scales

机译：宽带阻抗和DRIFT光谱相结合将分子筛的整体传感特性与分子过程相关联-一种弥合尺度的新方法

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Zeolites have been found to be promising sensor materials for a variety of gas molecules such as NH3, NOx, hydrocarbons, etc. The sensing effect results from the interaction of the adsorbed gas molecules with mobile cations, which are non-covalently bound to the zeolite lattice. The mobility of the cations can be accessed by electrical low-frequency (LF; mHz to MHz) and high-frequency (HF; GHz) impedance measurements. Recent developments allow in situ monitoring of catalytic reactions on proton-conducting zeolites used as catalysts. The combination of such in situ impedance measurements with diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), which was applied to monitor the selective catalytic reduction of nitrogen oxides (DeNOx-SCR), not only improves our understanding of the sensing properties of zeolite catalysts from integral electric signal to molecular processes, but also bridges the length scales being studied, from centimeters to nanometers. In this work, recent developments of zeolite-based, impedimetric sensors for automotive exhaust gases, in particular NH3, are summarized. The electrical response to NH3 obtained from LF impedance measurements will be compared with that from HF impedance measurements, and correlated with the infrared spectroscopic characteristics obtained from the DRIFTS studies of molecules involved in the catalytic conversion. The future perspectives, which arise from the combination of these methods, will be discussed.
机译：现已发现，沸石是用于各种气体分子（例如NH3，NOx，碳氢化合物等）的有前途的传感器材料。传感效果是由吸附的气体分子与非共价键合到沸石上的流动阳离子的相互作用产生的。格子。阳离子的迁移率可以通过电低频（LF; mHz到MHz）和高频（HF; GHz）阻抗测量来访问。最近的发展允许就地监测在用作催化剂的质子传导沸石上的催化反应。这种原位阻抗测量与漫反射红外傅里叶变换光谱法（DRIFTS）的结合，用于监测氮氧化物的选择性催化还原（DeNOx-SCR），不仅提高了我们对沸石催化剂的传感性能的了解完整的电信号传递给分子过程，但也弥合了正在研究的长度范围，从厘米到纳米。在这项工作中，总结了用于汽车排气特别是NH3的基于沸石的阻抗传感器的最新发展。将从LF阻抗测量获得的NH3电响应与HF阻抗测量获得的电响应进行比较，并与从DRIFTS研究涉及催化转化的分子获得的红外光谱特性相关联。将讨论这些方法的组合所产生的未来观点。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号