Modification of natural clinoptilolite zeolite to enhance its hydrogen adsorption capacity

被引：0
作者：
Sema Akyalcin
Levent Akyalcin
Ecem Ertugrul
机构：
[1] Eskişehir Technical University,Department of Chemical Engineering
来源：
Research on Chemical Intermediates | 2024年 / 50卷
关键词：
Natural zeolite; Clinoptilolite; Acid treatment; Hydrogen adsorption; Adsorption isotherm;
D O I：
暂无
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学科分类号：
摘要：
In this study, natural clinoptilolite was treated with HCl, HNO3, and C2H2O4 at various concentrations (0.1, 0.5, and 1.0 M) at different temperatures (60, 70, and 80 °C) and treatment times (2, 3, and 4 h). The hydrogen adsorption capacity of natural clinoptilolite increased from 0.446 to 3.255 mmol/g after treating with 0.5 M HNO3 at 80 °C for 2 h. The correlation of the newly produced textural and structural properties with hydrogen adsorption ability is explained by characterizing the modified clinoptilolites using X-ray fluorescence (XRF), X-ray diffraction (XRD), nitrogen adsorption/desorption isotherms, and temperature programmed desorption of ammonia (NH3-TPD) measurements. The results show that the hydrogen adsorption capacity of modified clinoptilolites is associated with both the quantity and strength of the strong acid sites, in addition to the enhanced surface area and micropore volume. The hydrogen adsorption data for natural and acid-treated clinoptilolite samples at 77 K obeyed the Freundlich isotherm model.
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页码：1455 / 1473
页数：18
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