Influence of acid activation on hydrogen adsorption properties of analcime-rich tuff from Turkey

In this study, structural, thermal, and hydrogen (H2) adsorption properties of natural analcime-rich zeolite tuff (A) from Trakya (Turkey) that acid-treated forms investigated. Analcime mineral was treated with 0.1, 0.5, 1, 2, 3 M HCl solutions at 80 °C for 5 h. Differences in structural thermal behaviors the analcime samples before after acid- treatment were examined by X-ray fluorescence spectroscopy (XRF), diffraction (XRD), Fourier transform infrared (FT-IR), scanning electron microscopy detector x-ray energy dispersive (SEM-EDX), analysis (TG-DTG-DTA) nitrogen methods. Micropore volume, micropore area, specific surface area values analcimes very high compared to sample. It found zeolites a SiO2/Al2O3 ratio exhibited higher H2 capacity stability. capacities 77 K up 100 kPa between 0.255 0.632 mmol/g. The increases order A < 05HA 01HA 1HA 2HA 3HA. Additionally, it determined had an almost linear connection BET areas.