Procedure

VN

Overview

A DIN SPEC based on the pre-standardization procedure is the result of standardization work which has not yet been published as a standard by DIN due to certain reservations regarding the content or due to the procedure for drawing up the standard which differs from that of a standard. This document has been prepared by Technical Committee CEN/TC 386 "Photocatalysis", the secretariat of which is held by AFNOR (France). This document describes 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 is not suitable for 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 described 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 standard the concentration of nitrogen oxides (NO_x) is defined as the stoichiometric sum of nitric oxide (NO) and nitrogen dioxide (NO₂). The responsible national standardization committee is NA 062-02-93 AA "Photokatalyse" ("Photocatalysis") at DIN Standards Committee Materials Testing (NMP).

Responsible national committee

NA 062-02-93 AA - Photocatalysis  

Responsible european committee

CEN/TC 386/WG 2 - Air purification