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BS EN 16980-1:2021 – TC:2022 Edition

BS EN 16980-1:2021 – TC:2022 Edition

$186.33

Tracked Changes. Photocatalysis. Continuous flow test methods – Determination of the degradation of nitric oxide (NO) in the air by photocatalytic materials

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BSI 2022 72
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This document specifies a method for assessing the performance of photocatalytic inorganic materials contained in cement mortars and/or limes or ceramic-based matrices, paints or materials deposited as thin films or coatings on a variety of substrates for the photocatalytic abatement of nitric oxide in the gas phase. This method does not apply to the assessment of samples to be applied with flow perpendicular to the surface or flow permeating the surface itself as polymeric and paper filters, honeycomb structures and suchlike.

The performance for the photocatalytic sample under test is evaluated by measuring the degradation rate of nitric oxide (NO) using the method specified herein. The photocatalytic abatement rate is calculated from the observed rate by eliminating the effects of mass transfer. The intrinsic photocatalytic abatement rate is an intrinsic property of the material tested and makes it possible to distinguish the photocatalytic activities of various products with an absolute scale defined with physical and engineering meaning.

For the measurements and calculations described in this document the concentration of nitrogen oxides (NOx) is defined as the stoichiometric sum of nitric oxide (NO) and nitrogen dioxide (NO2).

PDF Catalog

PDF Pages PDF Title
42 undefined
47 1 Scope
2 Normative references
3 Terms, definitions and abbreviations
3.1 Terms and definitions
48 3.2 Abbreviations and symbols
50 4 Principle
5 Interferences
6 Apparatus
6.1 General
6.2 Gas mixture preparation system
51 6.3 Illumination and measuring system
6.3.1 General
52 6.3.2 Illumination system L
53 6.3.3 Reaction chamber RE
56 6.3.4 NO/NO2 analyser
7 Sample preparation
7.1 Precaution
57 7.2 Sample characteristics
7.3 Conditioning
8 Measurement of concentrations
8.1 General
58 8.2 Measurement of the initial concentration of nitrogen oxides before entering the photochemical reactor
8.3 Conversion without sample
59 8.4 Conversion in the dark and in the presence of sample
8.5 Conversion under illumination in the presence of sample
60 9 Calculation of photocatalytic degradation rate
9.1 The observed rate of photocatalytic degradation
61 9.2 Intrinsic rate of photocatalytic transformation
10 Optional part for the use of different fan speeds
10.1 General
10.2 Conversion under illumination in the presence of sample at different fan speeds
62 10.3 Calculation of photocatalytic degradation rate at different fan speeds
10.3.1 The observed rate of photocatalytic degradation at different fan speeds
63 10.3.2 Intrinsic rate of photocatalytic transformation
11 Acceptability ranges of main test parameters
64 12 Test report
66 Annex A (informative)Typical trend of NO, NO2 and NOx concentrations during a photocatalytic test at nominal fan speed
67 Annex B (informative)Typical trend of NO, NO2 and NOx concentrations during a photocatalytic test using different fan speeds
68 Annex C (informative)Example of test for the control of mass transfer limitation
69 Annex D (informative)Typical Ohmic response of the fan

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BS EN 16980-1:2021 - TC
$186.33