Method for determining molecular sieve and adsorbate affinity AT value
A technology for molecular sieves and adsorbates, which is applied in the field of determination of the AT value of the affinity between molecular sieves and adsorbates, and can solve problems such as poor accuracy
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Embodiment 1
[0015] ZSM-5 / silicalite-1 core-shell molecular sieve A T Determination of value
[0016] Put the 13mg ZSM-5 / silicalite-1 core-shell molecular sieve sample into the vacuum desiccator quickly after removing water, and put the container containing solid n-hexane into the vacuum desiccator quickly; cover the lid of the vacuum desiccator and vacuumize For 15 minutes, the sample was equilibrated under the saturated vapor pressure of the adsorbate under study at an absolute pressure gauge of 43KPa and an operating temperature of 17°C for 24 hours. °C / min heating rate from room temperature to 470 °C to measure the weight loss of the molecular sieve sample, and calculate the affinity A between the molecular sieve and the adsorbate from the DTG peak temperature T The value is 111.86.
[0017] Table 1
[0018]
[0019] The above sample was repeatedly measured once, and the results of the repeated measurement twice were shown in Table 1, and its secondary determination A T The rela...
Embodiment 2
[0021] Silicalite-1 Molecular Sieve A T Determination of value
[0022] Put the 14mg Silicalite-1 molecular sieve sample into the vacuum desiccator quickly after removing the water, and put the container containing solid n-hexane into the vacuum desiccator quickly; cover the vacuum desiccator cover, and vacuumize for 20min to make the sample dry in the vacuum The temperature is 30KPa, the operating temperature is 25°C, and the adsorbate under study is equilibrated for 28 hours under the saturated vapor pressure. The equilibrated sample is taken out, and the temperature is raised from room temperature to Measure the weight loss of molecular sieve samples at 520°C, and calculate A from the DTG peak temperature T The value is 88.40.
[0023] Table 2
[0024]
[0025] The above sample was repeatedly measured once, and the results of the repeated measurement twice were shown in Table 2, and its secondary determination A T The relative standard deviation RSD of the value is o...
Embodiment 3
[0027] ZSM-5 Molecular Sieve A T Determination of value
[0028] Put the 15mg ZSM-5 molecular sieve sample into the vacuum desiccator quickly after dehydrating, and put the container containing solid n-pentane into the vacuum desiccator quickly; cover the vacuum desiccator, and vacuumize for 30min to make the sample At a vacuum degree of 22KPa and an operating temperature of 28°C, equilibrate for 30 hours under the saturated vapor pressure of the adsorbate under study, take out the balanced sample, and use a thermal analyzer to increase the temperature from room temperature at a rate of 19°C / min under a nitrogen atmosphere. Rise to 580°C to measure the weight loss of the molecular sieve sample, and calculate A from the DTG peak temperature T The value is 76.90.
[0029] table 3
[0030]
[0031] The above sample was repeatedly measured once, and the results of the repeated measurement twice were shown in Table 3, and its secondary determination A T The relative standard...
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