GB/T 23518-2020Palladium on carbon catalyst (English PDF)

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard replaces GB/T 23518-2009 "Palladium Carbon". Compared with GB/T 23518-2009, the main technical changes are as follows.

--- Increase the types of carrier carbon materials. carbon black, mesoporous carbon, carbon nanotubes, carbon molecular sieves (see Chapter 3, 5.3);

--- Delete the requirements for ash content in the original standard (see 4.4 and 5.3 of the 2009 edition);

--- Increased the requirements of palladium-carbon catalytic performance (see 5.3, 6.2);

---During the moisture content test, the drying temperature is changed from 70°C±5°C to 105°C±5°C, and the moisture content can also be measured by a moisture analyzer Take measurements. (See 6.4, 5.5 of the 2009 edition)

1 Scope

This standard specifies the classification and marking, technical requirements, test methods, inspection rules and markings, packaging, transportation, storage, quality certification of palladium carbon The contents of the specification and purchase order (or contract).

This standard applies to palladium carbon used in fine chemicals, pharmaceuticals and other hydrogenation reduction processes.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated references, the latest version (including all amendments) applies to this document.

GB/T 10722 Determination of total surface area and external surface area of carbon black by nitrogen adsorption method

YS/T 1072 Methods for chemical analysis of palladium on carbon-Determination of palladium content-Inductively coupled plasma atomic emission spectrometry

YS/T 1073 Palladium-carbon chemical analysis method. Determination of lead, copper and iron content. Inductively coupled plasma atomic emission spectrometry

3 Terms and definitions

The following terms and definitions apply to this document.

4 Classification and marking

According to the mass fraction of palladium in the product and the type of carbon.

Marking. mass fraction (%)-Pd/C- carbon type

Example:

The mass fraction of Pd (%) is 3%, and the carrier is palladium carbon with activated carbon, which is marked as. 3%-Pd/C-activated carbon.

5 Technical requirements