ISO TS 23362-2021 PDF

Full title and description

Nanotechnologies — Nanostructured porous alumina as catalyst support for vehicle exhaust emission control — Specification of characteristics and measurement methods. This ISO Technical Specification defines the measurable characteristics and recommended measurement methods for nanostructured porous alumina in powder form used as a catalyst support in vehicle exhaust emission control systems (primarily for gasoline-powered cars).

Abstract

This document lists critical and additional characteristics of nanostructured porous alumina that should be measured (for example specific surface area, specific pore volume, pore diameter, density and impurity content) and recommends standardized measurement methods (gas adsorption/BET/BJH, ICP, XRF, etc.). It specifies which characteristics are mandatory to report to buyers and notes that some measurements (e.g., specific surface area and pore volume) should be taken before and after thermal treatment. The specification does not cover health, environment or safety-specific characteristics.

General information

• Status: Published — Technical Specification (confirmed and reviewed in 2024; remains current).
• Publication date: January 2021.
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 07.120; 43.060.20.
• Edition / version: Edition 1 (2021) — ISO/TS 23362:2021.
• Number of pages: 10 pages.

Key bibliographic and status details above are taken from the ISO catalogue entry and the published Technical Specification.

Scope

Applies to nanostructured porous alumina in powder form intended as catalyst support for vehicle exhaust emission control (targeted at gasoline-powered cars). The document specifies which physical and chemical characteristics are critical or recommended to measure and provides recommended measurement methods for each characteristic. It excludes requirements specific to health, environmental or safety aspects and notes that users must validate the applicability of referenced measurement standards to nanostructured porous alumina. Storage and sample-conditioning (to avoid moisture adsorption) are highlighted as important for comparable results.

Key topics and requirements

• Definition of critical and additional characteristics for nanostructured porous alumina (e.g., specific surface area, specific pore volume, pore diameter, apparent/tap density, impurity content, loss on ignition).
• Recommended measurement methods: gas adsorption (BET/BJH), pore analysis standards, ICP-AES/OES for metallic impurities, XRF for elemental analysis, density/tap tests and thermal-treatment protocols.
• Requirement to measure and report critical characteristics to buyers; SSA and specific pore volume to be measured both before and after specified thermal treatment.
• Guidance that referenced international measurement standards may need validation for nanoporous alumina and that buyer/seller agreements should cover sample storage and conditioning.
• Terminology aligned with ISO vocabulary documents for nanotechnologies (references to ISO/TS 80004 series and related measurement standards).

These topics and requirements are summarized and organized from the specification's tables of characteristics and measurement-method recommendations.

Typical use and users

Primary users include catalyst-support and ceramic manufacturers, automotive catalyst formulators, quality control and R&D laboratories, suppliers and purchasers of nanostructured porous alumina, and standards bodies/test houses validating measurement methods for nanoporous materials. The document is used during material specification, incoming quality inspection, supplier qualification and R&D to ensure consistent reporting of material properties for vehicle exhaust catalysts.

Related standards

Commonly referenced documents include ISO/TS 80004 series (nanotechnology vocabulary), ISO 18757 (gas adsorption), ISO 15901 series (porous materials/pore analysis), ISO 9277 (specific surface area), ISO 9161 (bulk and tapped density), and other ISO analytical and material standards used as measurement-method references. Users should consult the normative references listed in ISO/TS 23362:2021 for the full set of related standards.

Keywords

nanostructured porous alumina; catalyst support; vehicle exhaust emission control; three-way catalytic converter; specific surface area (SSA); pore volume; pore diameter; BET; BJH; ICP; XRF; nanotechnologies; measurement methods.

FAQ

Q: What is this standard?

A: ISO/TS 23362:2021 is an ISO Technical Specification that defines measurable characteristics and recommended measurement methods for nanostructured porous alumina used as catalyst support in vehicle exhaust emission control systems.

Q: What does it cover?

A: It covers the identification of critical and additional physical and chemical characteristics (e.g., SSA, pore volume, pore size, density, impurities), prescribes or recommends measurement methods for those characteristics, and gives guidance on sample conditioning and reporting; it does not address health, environmental or safety-specific requirements.

Q: Who typically uses it?

A: Manufacturers and suppliers of catalyst supports and ceramic honeycomb substrates, automotive catalyst developers, quality and testing laboratories, and procurement/specification teams in the automotive supply chain.

Q: Is it current or superseded?

A: It was published in January 2021 (Edition 1) and the ISO catalogue entry indicates the publication was reviewed and confirmed in 2024, so this version remains current.

Q: Is it part of a series?

A: It is a Technical Specification produced under ISO/TC 229 (Nanotechnologies) and references vocabulary and characterization documents in the ISO/TS 80004 series and multiple ISO measurement standards; it should be read alongside those normative references.

Q: What are the key keywords?

A: Nanostructured porous alumina, catalyst support, vehicle exhaust, pore structure, specific surface area, BET, BJH, ICP, XRF, nanotechnologies.