GB/T 38691-2020 in English

VALID

Testing method for specific surface area of petroleum refining catalysts

Issued on:2020-03-31
Implemented on:2021-02-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $120.00
$117.00

Standard No:	GB/T 38691-2020
Document status:	VALID
Title in English:	Testing method for specific surface area of petroleum refining catalysts
Title in Chinese:	石油炼制催化剂比表面积测试方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-03-31
Implemented on:	2021-02-01
ICS Classification:	71.100.99-Other products of the chemical industry
Chinese Classification:	G74-Basic standards and general methods for catalyst
Professional Classification:	GB-National Standard
Related Keywords:	petroleum refining catalysts test method specific surface area petroleum refining catalysts introduction analysis static nitrogen adsorption capacity method
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《GB/T 38691-2020石油炼制催化剂比表面积测试方法》由TC63（全国化学标准化技术委员会）归口，TC63SC10（全国化学标准化技术委员会化工催化剂分会）执行，主管部门为中国石油和化学工业联合会。

Introduction

Analysis of the core content of the standard

This standard specifies the standardized method for determining the specific surface area of petroleum refining catalysts using the static nitrogen adsorption capacity method, which is mainly applicable to:

Micro-mesoporous structure catalytic cracking catalyst
mesoporous structure distillate oil hydrotreating catalyst
catalytic reforming catalyst

Comparison of key technical indicators

Parameters	Catalytic cracking catalyst	Hydrotreating catalyst	Test requirements
Pore structure type	Micropore + Mesopore	Mainly Mesopore	Need to clarify the classification
BET test range	0.05-0.20 relative pressure	0.05-0.20 relative pressure	≥5 test points
Precision requirement	≤8.0 m²/g	≤8.0 m²/g	Repeatability limit

Key points for implementation of test method

1. Sample pretreatment

After sampling according to the requirements of GB/T 6679-2003, it is necessary to Degas at 300℃ in the class=instrument>vacuum degassing device for more than 4 hours, and the system vacuum degree must reach below 1.3 Pa.

2. Adsorption experiment operation

Use fully automatic physical adsorption instrument, test at liquid nitrogen temperature (77K)
Collect ≥20 data points in the relative pressure range of 0.01-0.99
Guarantee ≥5 data points in the key area (0.05-0.20)

3. Data processing specifications

The BET equation calculation must meet the following requirements:

Linear correlation coefficient R²≥0.9999
The constant C value must be positive
The monolayer adsorption capacity V_m is calculated by the intercept slope method

Analysis of standard technology evolution

This standard integrates GB/T 21650.2-2008 and NB/SH/T 0959-2017 technical requirements, the main innovations include:

Case application: A refinery catalytic cracking agent test showed that when the C value is less than 50, the degassing effect needs to be checked. The actual case shows that extending the degassing time to 6 hours can increase the C value to more than 120.