@inproceedings{874996202e184a9b90b539708ed5969a,
title = "In-situ imaging of reacting single-particle zeolites by non-linear optical microscopy",
abstract = "Zeolite catalysis has been exploited by the petrochemical industry since the 1940's for catalytic cracking reactions of long chain hydrocarbons. The selectivity of zeolites strongly depends on a pore size, which is controlled by the chosen structure-directing agent (SDA) and by the SDA decomposition/removal process. Although zeolites are composed of micron-sized crystals, studies of zeolite materials typically focus on bulk (i.e., ensemble) measurements to elucidate structure-function information or to optimize catalysts and/or process parameters. To examine these phenomena on the microscale, non-linear optical microscopy is used to provide real-time imaging of chemical reactions in zeolites at temperatures exceeding 400°C. The template decomposition mechanism is studied, as elucidation of the mechanism is critical to understanding the relationship between the decomposition chemistry and the nanoscale features of the zeolite (topology, Si/Al ratio, added dopants). Forward stimulated Raman scattering (SRS), forward coherent anti-Stokes Raman scattering (CARS) and epi two-photon fluorescence (TPF) modalities are acquired simultaneously providing video-rate structural and chemical information. A high-temperature cell with gas inlet system is used for the study of reactions under various temperatures and gas environments. Examining the decomposition process with single-particle resolution enables access to ensemble-level and spatially-resolved behavior. Parallel experiments on bulk zeolite powders are conducted to enable comparison of ensemble and single-particle behavior during template decomposition. Our multi-technique approach has high potential for gaining insight into the link between nanoscale structure and catalytic activity and selectivity of zeolitic materials.",
author = "Wrzesinski, {Paul J.} and Slipchenko, {Mikhail N.} and Zaman, {Taslima A.} and Rioux, {Robert M.} and Gord, {James R.} and Sukesh Roy",
note = "Publisher Copyright: {\textcopyright} 2015 SPIE.; Frontiers in Ultrafast Optics: Biomedical, Scientific, and Industrial Applications XV ; Conference date: 08-02-2015 Through 10-02-2015",
year = "2015",
doi = "10.1117/12.2080339",
language = "English (US)",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Michel Meunier and Herman, {Peter R.} and Stefan Nolte and Alexander Heisterkamp",
booktitle = "Frontiers in Ultrafast Optics",
address = "United States",
}