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The natural Na-type montmorillonite (Na-MMT) was activated by HNO 3 (20 wt.%) solution under the different temperature and time to obtain acid activated MMT (Acid-MMT). Zn (4 wt.%) was supported on Acid-MMT via the impregnation method by using Zn(NO 3 ) 2 ·6H 2 O as a precursor. The catalytic performance of the Zn/Acid-MMT for the aromatization of heptane was investigated. The results indicated that the amount and distribution of acidity of Acid-MMT which could be adjusted by altering the aciddoi:10.1180/clm.2020.36 fatcat:fnzn6rc3sfcdfbhsub2kgijkc4