A study of some surface properties of samples of Syrian natural zeolite and the effect of the acidic treatment

Three samples of Syrian natural zeolite from Om Ezen site were studied. We studied the surface properties of samples before and after treatment with hydrochloric acid solution (pH=3 - 4). We used the adsorption method of nitrogen gas at 77 K. The specific surface area was measured by BET method and standard isotherm methods (t-method, αs-method). Texture structure parameters were determined for all samples before and after treatment (total pore size, micro and meso porosity, and pore radius). We found that the isotherms for all samples (before and after acidic treatment), for II and VI types were equal. The isotherms showed hystorysis, and we noticed that after acidic treatment increases in the surface area and decreases in micro porosity for samples N-83, N-86 but no changing in sample N-79. The methods used in the paper gave same results. The avuoge pore radius is in the range of micro porosity, but these values increase for N-83, N-86 Samples after acidic treatment. The acidic treatment showed large changing in surface structure. (author)