M Irwin A M Boies J J Swanson H J Schulz ºCatalytic Instruments BACKGROUND ºCatalytic Instruments GmbH amp CoKG specialise in the production of innovative aerosol instrumentation and services founded on catalytic stripper CS technology ID: 1014751
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1. CATALYTIC STRIPPER EMERY OIL REMOVAL EFFICIENCYM. Irwin, A. M. Boies, J. J. Swanson, H.-J. Schulz ºCatalytic Instruments
2. BACKGROUNDºCatalytic Instruments GmbH & Co.KG specialise in the production of innovative aerosol instrumentation and services founded on “catalytic stripper” (CS) technologyCatalytic Stripper (CS)Common component of a Volatile Particle Remover (VPR)More robust than a simple thermodenuder/evaporation tube for the new proposed sub-23nm roll-off Passes current challenge aerosol test (tetracontane)Next challenge: “ > 99% removal efficiency of polydisperse alkane or emery oil with count median diameter > 50 nm and mass > 1 mg/m3”2
3. VPRA VPR is deployed to ensure only the solid fraction of aerosol is measured by the Particle Number Counter (PNC)Legislated levels are for the VPR system as a wholeTo ensure robustness, we tested the CS at undiluted levelsVOLATILE PARTICLE REMOVERAcronymDefinitionPSPParticle Sampling ProbePTTParticle Transfer TubePCFParticle pre-classifierVPRVolatile Particle RemoverPNCParticle Number CounterCSCatalytic StripperPND2Particle Number Diluter 2
4. EXPERIMENTAL GOALSPerformance with dilutionExamine the removal efficiency of the CS015 under expected load conditions, i.e. with concentration appropriate to PND1 operating at a dilution factor of at least 100102Performance without dilutionExamine the removal efficiency of the CS015 without any dilution stages—”worst case scenario”, i.e. with no or failed PND1
5. EXPERIMENTAL SETUPEmery oil diluted in n-propanol1.5 L/min flow rate through CS015CS015 operated at 350ºCSMPS with multiple charge correction enabled
6. EMERY OIL SIZE DISTRIBUTION - DILUTED
7. EMERY OIL CS REMOVAL EFFICIENCYNumber removal efficiency = 99.8%Mass removal efficiency = 99.99%
8. EMERY OIL CS REMOVAL EFFICIENCYNumber removal efficiency = 99.8%Mass removal efficiency = 99.99%
9. EMERY OIL SIZE DISTRIBUTION - UNDILUTED
10. EMERY OIL CS REMOVAL EFFICIENCYNumber removal efficiency = 99.4%Mass removal efficiency = 99.99%
11. EMERY OIL CS REMOVAL EFFICIENCYNumber removal efficiency = 99.4%Mass removal efficiency = 99.99%
12. WHAT ABOUT THIS RESIDUAL MODE?Not all particles removed?These are contaminant particles that form from metallic ionic compounds present in the mixture (n-propanol and emery oil) These compounds form small metallic nanoparticles when the solvent evaporatesThis can demonstrated in two ways 1) pure generation technique (no solvent) 2) a tandem CS
13. RESULTS SUMMARYCONCENTRATIONNUMBER REMOVAL EFFICIENCYMASS REMOVAL EFFICIENCYDILUTED9.9x105 /cc GMD 56nm0.15 mg/m399.80%99.99%UNDILUTED2.2x106 /ccGMD 64nm1.21 mg/m399.40%99.99%
14. CONCLUSIONS140103Performance with dilutionRemoval efficiency target of > 99% reach for diluted concentration of Emery Oil, w.r.t number and mass0102Performance without dilutionRemoval efficiency target of > 99% reach for raw concentration of Emery Oil, w.r.t number and massApplication Note CI-00070Scan the QR code to the right to download the application note pdf with detailed explanation and more data.
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16. Catalytic Stripper — a more robust solutionEvaporation Tube (ET) alone has been shown to not remove all volatile components in some cases1,2The ET may even generate solid particles under certain conditions2 The Catalytic Stripper (CS) is a robust solution to the requirement of solid particle measurementThe CS complies with current PMP regulation directly (i.e. > 99.99% removal of challenge aerosol at 50nm) simply a more robust ET in the VPR system, with catalytic membranes for higher volatile removal efficiency1Amanatidis, S., Ntziachristos, L., Karjalainen, P., Saukko, E., Simonen, P., Kuittinen, N., … R Onkk O B, T. (2018). AS&T Comparative performance of a thermal denuder and a catalytic stripper in sampling laboratory and marine exhaust aerosols. https://doi.org/10.1080/02786826.2017.14222362Swanson, Jacob and David Kittelson, 2010. Evaluation of thermal denuder and catalytic stripper methods for solid particle measurements, Journal of Aerosol Science, Volume 41, Issue 12, Pages 1113-1122.16
17. CONCLUSIONSPerformance with dilutionNumber removal efficiency > 99.8%Mass removal efficiency > 99.99%01
18. CONCLUSIONS02Performance without dilutionNumber removal efficiency > 99.4%Mass removal efficiency > 99.99%