Hydrogen peroxide modified Mg–Al–O oxides supported Pt–Sn catalysts for paraffin dehydrogenation

• A new method to prepare Mg–Al–O oxide by the addition of H2O2 was developed.
• New-made Mg–Al–O oxide has low density, big pore structure and uniform morphology.
• Pt–Sn/Mg–Al–O catalysts have high Pt dispersion and high dehydrogenation activity.
• Pt–Sn/Mg–Al–O catalysts have low acidity, high selectivity and good stability.

In this work, a new method to prepare Mg–Al–O oxide by co-precipitation method with addition of H2O2 was developed. The application of Mg–Al–O as a support of Pt–Sn catalysts for paraffin dehydrogenation was investigated. Characterization results indicated that modification of H2O2 (i) enlarged the pore structure and decreased the density and mechanical strength of the Mg–Al–O oxide and (ii) increased the platinum dispersion, weakened the acidity of the Pt–Sn/Mg–Al–O catalysts. Dehydrogenation of n-dodecane results showed that modification of H2O2 (iii) improved the paraffin conversion and olefin selectivity; (iv) inhibited the coke deposition on the catalyst and (v) extended the catalyst life-time.

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