Study On Solid Superacid Catalyst For Light Paraffine Isomerization

The paper presents the preparation of solid supracid catalyst for Light paraffineisomerization.Select n-pentane as reaction medium to evaluate catalyst .It has evaluated on the experimentset-up composed of high pressure microreactor used 10 ml continous flow fixed-bed and ofchromatography unit. Solid superacid catalyst was prepared with ZrO2 as carrier and H₂SO₄ asimmersed liquid.In order to prepare suitable catalyst,the effect of calcinations temperature,concentration of SO₄^2-, addition second electropositive oxid, addition transitional metal andreaction conditions are respectively investigated.The results show that performance of catalystcan effect by added the second ilectropositive oxid- Al₂O₃,WO₃ and loaded Pt,Ni,Pd.Thereintothe performance of catalyst added Al₂O₃ and loaded Pt is the best.According to the evaluate and the sift through light paraffine isomerization catalyst,It showsthat preparated Pt-SO₄^2-/ZrO₂-Al₂O₃ catalyst achieved superior activity under the condition thatthe calcination temperature is 650°C , concengtration of SO₄^2- is 0.5mol/L, the content ofAl₂O₃ is 30% and content of Pt is 5%.The selected prepared catalyst for isomerization of light oilis used under the reaction conditions of 260°C, 2.0MPa, WHSV=1.0h-1 , H2/Hydrocarbon molarration 4.0, n-pentane conversion rate is 62.17%,isopentane yield is 57.01%(isomerization rate is58.00%), isopentane selectivity is 91.60%, liquid product yield is 94.84%. Solid superacidcatalyst has extensive application foreground for its advantages of easy separation and nocorruption .