YS/T 438.4-2013Methods for physical performance determination of sandy alumina. Part 4: B.E.T method for determination of specific surface area (English PDF)

Foreword

YS/T 438 "sandy alumina determination of physical performance" is divided into five sections.

--- Part 1. Determination of particle size distribution by sieving;

--- Part 2. Determination of the abrasion index;

--- Part 3. Determination of angle of repose;

--- Part 4. Determination of specific surface area;

--- Part 5. Determination of alpha- alumina content of X- ray diffraction.

This is Part 4.

The partial replacement of YS/T 438.4-2001 "sandy alumina determination of physical performance than the surface area determination." this part is YS/T 438.4-2001 "sandy alumina determination of physical performance of the specific surface area measurement," the amended and YS/T 438.4-2001 compared to the main changes are as follows.

--- Original measurement step to ST-03-type surface and pore size analyzer written by common standards for the preparation than the surface area analyzer;

--- Increased precision;

--- Increased quality assurance and control of the content;

--- The drying temperature of the sample is "300 °C ± 10 °C" changed to "105 °C ± 5 °C".

This section drafted in accordance with GB/T 1.1-2009 given rules.

The non-ferrous metal part by the National Standardization Technical Committee (SAC/TC243) centralized.

This part mainly drafted by. Aluminum Corporation of China Guangxi Branch, Luoyang Xiangjiang Wanji Aluminum Co., Ltd.

1 Scope

This section specifies the method for the determination of the specific surface area sandy alumina continuous flow chromatography.

This section applies to sandy alumina ratio of surface area measurement.

2 Method summary

Based on low-temperature physics adsorption principle, a single channel continuous flow of gas chromatography, by measuring the sandy alumina samples in liquid nitrogen (-196 °C) at a temperature on the adsorption of nitrogen using adsorption theory and calculated the BET specific surface area of the sample layers.

3 Reagents

3.1 Nitrogen. more than 99.99% purity.

3.2 Helium. purity of 99.99%.

3.3 high purity liquid nitrogen.

3.4 ethanol. AR.

3.5 Industrial hydrochloric acid.

3.6 glass wool.

3.7 cotton.

4 Instrument

Surface area enables the nitrogen adsorption occurs at liquid nitrogen (-196 °C) temperature and single-point or multi-point analysis. 4.1 surface area analyzer Analyzer.

4.2 Determination of the data processing system.

4.3 sample tube.

4.4 dryer.

4.5 Oven. Maximum temperature 300 °C.

4.6 Analytical balance. accuracy 0.1mg.

4.7 mug.

5 Sample

5.1 empty sample tube (4.3) at 105 °C ± 5 °C drying for about 30min, desiccator (4.4) to cool to room temperature, and call quality.

5.2 Sample loaded sample tube (5.1), the sample together with a sample tube together drying 2h at 105 °C ± 5 °C, remove the desiccator (4.4) to cool to room temperature in standby.

5.3 will bake a good sample and sample tube (5.2) to determine the quality of subtraction of the sample, the sample tube end lightly stuffed with wool, the completed