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BS EN 16980-1:2021

BS EN 16980-1:2021

$142.49

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

Published By Publication Date Number of Pages
BSI 2021 32
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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
2 undefined
7 1 Scope
2 Normative references
3 Terms, definitions and abbreviations
3.1 Terms and definitions
8 3.2 Abbreviations and symbols
10 4 Principle
5 Interferences
6 Apparatus
6.1 General
6.2 Gas mixture preparation system
11 6.3 Illumination and measuring system
6.3.1 General
12 6.3.2 Illumination system L
13 6.3.3 Reaction chamber RE
16 6.3.4 NO/NO2 analyser
7 Sample preparation
7.1 Precaution
17 7.2 Sample characteristics
7.3 Conditioning
8 Measurement of concentrations
8.1 General
18 8.2 Measurement of the initial concentration of nitrogen oxides before entering the photochemical reactor
8.3 Conversion without sample
19 8.4 Conversion in the dark and in the presence of sample
8.5 Conversion under illumination in the presence of sample
20 9 Calculation of photocatalytic degradation rate
9.1 The observed rate of photocatalytic degradation
21 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
22 10.3 Calculation of photocatalytic degradation rate at different fan speeds
10.3.1 The observed rate of photocatalytic degradation at different fan speeds
23 10.3.2 Intrinsic rate of photocatalytic transformation
11 Acceptability ranges of main test parameters
24 12 Test report
26 Annex A (informative)Typical trend of NO, NO2 and NOx concentrations during a photocatalytic test at nominal fan speed
27 Annex B (informative)Typical trend of NO, NO2 and NOx concentrations during a photocatalytic test using different fan speeds
28 Annex C (informative)Example of test for the control of mass transfer limitation
29 Annex D (informative)Typical Ohmic response of the fan

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BS EN 16980-1:2021
$142.49