Energy Storage Science and Technology ›› 2023, Vol. 12 ›› Issue (1): 42-50.doi: 10.19799/j.cnki.2095-4239.2022.0429

• Energy Storage Materials and Devices • Previous Articles     Next Articles

Preparation and performance evaluation of mineral-based magnesium sulfate thermochemical adsorption materials

Yelong ZHANG1(), Qi MIAO2,3, Pengfei SONG1, Linghua TAN2,3, Yi JIN1(), Yulong DING4   

  1. 1.Jiangsu Jinhe Energy Technology Company Limited, Jurong 212499, Jiangsu, China
    2.School of Chemistry and Chemical Engineering, Nanjing University of Science & Technology
    3.National Special Superfine Powder Engineering Research Center of China, Nanjing 210094, Jiangsu, China
    4.University of Birmingham, Birmingham B15 2TT, UK
  • Received:2022-08-03 Revised:2022-08-12 Online:2023-01-05 Published:2023-02-08
  • Contact: Yi JIN E-mail:ZYL1988219@163.com;yi.jin@jinhe-energy.com

Abstract:

In this study, mineral materials such as the attapulgite, the diatomite, and the expanded vermiculite were used as carriers to create mineral-based magnesium sulfate thermochemical adsorption materials using the equivalent-volume impregnation approach. The microstructures of mineral carriers and mineral-based magnesium sulfate composites were evaluated by X-ray diffraction, scanning electron microscopy, and specific surface area and pore structure tests. The adsorption/desorption kinetic and thermal storage performance of mineral-based magnesium sulfate composites were evaluated using thermal weight loss, dynamic water vapor adsorption, and differential scanning calorimetry tests. It was discovered that the disc-shaped microstructure of the diatomite made possible the faster desorption/adsorption reaction rate and greater thermal storage capacity of the composites, and the heat of desorption reaction could reach 557.1 kJ/kg. Additionally, the ambient temperature of 25 ℃ and the relative humidity of 85% were the ideal adsorption reaction conditions for the mineral-based magnesium sulfate composites.

Key words: magnesium sulfate, mineral carrier, thermochemical heat storage, adsorption

CLC Number: