Hydroisomerization of n-Dodecane over Pt/SAPO-11 Catalyst
Following the hydrodeoxygenation of oil and grease feedstocks,the subsequent pro-hydrogen isomerization step assumes a pivotal role in the preparation of bio-aviation.A Pt/SAPO-11 catalyst was meticulously synthesized through the impregnation method,involving the loading of Pt onto SAPO-11 molecular sieve.Comprehensive characterization of the physicochemical properties of both the molecular sieve and the catalyst was conducted.Subsequently,the isomerization performance of the catalyst was assessed using a fixed-bed hydrogenation reactor,employing n-dodecane as a model compound.The results showed the temperature as the primary influencing factor on conversion and selectivity.Specifically,as the reaction temperature increased from 350℃ to 390℃,the conversion of n-dodencane was increased from 18.8% to 86.2%,the selectivity of isododecane was decreased from 99.7% to 67.2% .Under the conditions of 380℃,2 MPa,weight hourly space velocity of 0.45 h-1,and hydrogen-oil volume ratio of 1 500,the conversion of n-dodecane reached 80.5%,and the selectivity of isododecane was 70.1% .
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