Balanced Fast-SpaciMS capillary configurations provide practically noninvasive channel-average measurements in catalytic monoliths

0578877 - ÚT 2024 RIV GB eng J - Journal Article
Hlavatý, Tomáš - Kočí, P. - Isoz, Martin - Deka, D. - Partridge, W.
Balanced Fast-SpaciMS capillary configurations provide practically noninvasive channel-average measurements in catalytic monoliths.
Chemical Engineering Science. Roč. 282, December (2023), č. článku 119272. ISSN 0009-2509. E-ISSN 1873-4405
Institutional support: RVO:61388998
Keywords : SpaciMS * SpaciFTIR * CO oxidation * three-way catalyst * CFD
OECD category: Chemical process engineering
Impact factor: 4.7, year: 2022
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S000925092300828X

Spatially resolved capillary-inlet mass spectrometry (SpaciMS) provides a detailed picture of the spatiotemporal evolution of reaction network in catalytic monoliths. In the present work, we combine the SpaciMS experiments with a newly developed non-isothermal 3D CFD model for heterogeneously catalyzed reactive flows, including diffusion and permeation through the coated catalyst and channel wall. We explore how the capillary size and sampling rate can be balanced to minimize the impact on probed-channel conversions and provide species concentration measurements representative of the free channel average. In all studied configurations, the balanced sampling-rate fraction is noticeably higher than the corresponding capillary occlusion fraction. For a typical 350-micron capillary that occupies 11% of the channel cross- section, the balanced sampling rate represents 43% of the channel flow. The present work shows that together, a balanced SpaciMS configuration and numerical simulation provide accurate channel-averaged information of a monolithic catalyst under realistic operation conditions.
Permanent Link: https://hdl.handle.net/11104/0348039