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Through the temperature-programmed desorption of ammonia, an additional acid site (named h + -peak) was identified on an HZSM-5 treated with ammonia water and acidic solutions. The h + -peak appeared at ca. 780 K, higher than that for a normal acid site. The strength of the additional acid site ΔH was calculated to be 185-192 kJmol -1 on the basis of a theoretical equation...
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