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    ASTM D3943 - 21

    Standard Test Method for Total Molybdenum in Fresh Alumina-Base Catalysts

    Active Standard ASTM D3943 | Developed by Subcommittee: D32.03

    Book of Standards Volume: 05.06


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    Significance and Use

    4.1 This test method sets forth a procedure by which catalyst samples can be compared either on an interlaboratory or intralaboratory basis. It is anticipated that catalyst producers and users will find this method of value.

    1. Scope

    1.1 This test method covers the determination of molybdenum in alumina-base catalysts and has been cooperatively tested at molybdenum concentrations from 8 to 18 weight %, expressed as MoO3. Any component of the catalyst other than molybdenum such as iron, tungsten, etc., which is capable of being oxidized by either ferric or ceric ions after being passed through a zinc-amalgam reductor column (Jones reductor) will interfere.

    1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

    1.3 Many catalysts that contain molybdenum also contain other metals, nickel for example, that may be regulated by the EPA. Go to the material safety data sheet for the catalyst material being analyzed. More information can be found at EPA.gov. Additional information on nickel containing catalysts can be found in Test Method D4481.

    1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

    1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.


    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    D1193 Specification for Reagent Water

    D4481 Test Method for Total Nickel in Fresh Alumina-Base Catalysts

    D7442 Practice for Sample Preparation of Fluid Catalytic Cracking Catalysts and Zeolites for Elemental Analysis by Inductively Coupled Plasma Optical Emission Spectroscopy

    E173 Practice for Conducting Interlaboratory Studies of Methods for Chemical Analysis of Metals

    E507 Test Method for Determination of Aluminum in Iron Ores by Flame Atomic Absorption Spectrometry


    ICS Code

    ICS Number Code 71.040.30 (Chemical reagents)

    UNSPSC Code

    UNSPSC Code 12161600(Catalysts)


    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/D3943-21

    Citation Format

    ASTM D3943-21, Standard Test Method for Total Molybdenum in Fresh Alumina-Base Catalysts, ASTM International, West Conshohocken, PA, 2021, www.astm.org

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