Work

Kaolin-Based Hydrogen Adsorption: Impact of Surface Pretreatment

Year: 2025

Type: article

Abstract: Hydrogen storage is one of the critical points in the widespread adoption of hydrogen. Kaolin shows strong potential, as it allows for greater adsorption of small molecules such as H 2, and its adsorption capacity can be increased by improving its surface properties through chemical pretreatment. For this purpose, kaolin was pre-treated with HCl to investigate the effect of varying temperature, duration, and acid concentration on clay structure and H 2 adsorption. With increased acidic and thermal conditions, the SiO 2 /Al 2 O 3 ratio increased, while the intensity of Al– O –H peaks in FT-IR results decreased. Kaolinite peaks became more pronounced with increasing acid concentration and had increased crystallinity, while SEM showed the rod/spiky fine flake structure. These changes affected the surface area and pore structure, thereby increasing its H 2 adsorption capacity (from 0.0844 mmol/g to 0.1691 mmol/g). Although increasing duration improved the structure, it reduced hydrogen adsorption by 8.3–16 %. Treated kaolin has a homogeneous structure for H 2 adsorption.

Source: International Journal of Hydrogen Energy

DOI: 10.1016/j.ijhydene.2025.151733

Authors: Ezgi Bayrakdar Ates, Fatih Sorgulu, Muhammed Iberia Aydin

Institutions: Yalova University, Yıldız Technical University

Language: English

Topic: Hydrogen Storage and Materials

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,730

Funder: Yildiz Teknik Üniversitesi