甲醇和庚烷暴露导致 4A、5A 和 13X 分子筛的水蒸气吸附能力损失,ACS Omega

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甲醇和庚烷暴露导致 4A、5A 和 13X 分子筛的水蒸气吸附能力损失
ACS Omega ( IF 3.7 ) Pub Date : 2022-02-17 , DOI: 10.1021/acsomega.1c03370
Prabhu Azhagapillai _{1,

2} , Maryam Khaleel _{1,

2} , Fouad Zoghieb _{1,

2} , Gisha Luckachan ₂ , Liyamol Jacob ₂ , Donald Reinalda _{1,

2}

Affiliation

基于沸石的分子筛因其高吸水能力和极低的水蒸气平衡压力而应用于工业脱水装置。在其使用寿命期间，它们往往会慢慢失去其水蒸气吸附能力。为了优化干燥装置中分子筛的使用，了解导致失活的机制至关重要。在这项工作中，通过在相对苛刻的条件下使用重复吸附/再生循环将 LTA 和 FAU 型沸石暴露于甲醇和庚烷蒸汽来研究容量损失。设计了一个简单的微流单元并将其用于失活实验。使用重量分析仪测量所得样品的水蒸气吸附能力。此外，它们还通过经典的 XRD、¹³C NMR和TGA技术。即使在暴露于污染物之后，新鲜和用过的沸石 XRD 图案的结晶度也没有受到显着影响。发现甲醇容易引起水蒸气吸附能力的严重损失，比庚烷更严重。暴露于甲醇的样品中的水蒸气吸收量比新鲜沸石低约 50%。这归因于非挥发性的残留碳氢化合物。

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Water Vapor Adsorption Capacity Loss of Molecular Sieves 4A, 5A, and 13X Resulting from Methanol and Heptane Exposure

Zeolite-based molecular sieves are applied in industrial dehydration units for their high water uptake capacities and extremely low equilibrium pressure of water vapor. During their operational life, they tend to lose their water vapor adsorption capacity slowly. To optimize the usage of molecular sieves in dryer units, it is vital to understand the mechanism(s) leading to deactivation. In this work, the capacity loss was studied by exposing LTA- and FAU-type zeolites to methanol and heptane vapors under relatively harsh conditions using repetitive adsorption/regeneration cycles. A simple microflow unit was designed and used for the deactivation experiments. The water vapor adsorption capacity of the resulting samples was measured using a gravimetric analyzer. In addition, they were characterized by classic XRD, ¹³C NMR, and TGA techniques. The crystallinity of fresh and spent zeolite XRD patterns was not drastically affected even after exposure to the contaminants. It was found that methanol easily gave rise to a severe loss of water vapor adsorption capacity, much more so than heptane. Water vapor uptake in the methanol exposed samples is ∼50% lower than that for the fresh zeolites. This is attributed to nonvolatile, residual hydrocarbons.

更新日期：2022-02-17

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