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采用水热法合成出不同硅铝比的SAPO-11分子筛,负载Pt后在固定床反应器上对正十八烷进行临氢异构化.采用XRD、BET、SEM、TEM和NH_3-TPD对分子筛及催化剂进行表征.考察了不同Si含量对正十八烷临氢异构性能的影响,确定硅铝比为0.3最适宜;改变反应温度、压力、空速以及氢油比等参数,考察了0.5%Pt/SAPO-11催化剂的异构化性能.结果表明:340℃、3 MPa、空速为1 h-1和氢油体积比为1 000∶1时,正十八烷转化率达到73.1%,煤汽油比1.44,异构收率64.2%.
Hydrothermal method was used to synthesize SAPO-11 molecular sieve with different Si / Al ratio. Hydrogenation of n-octadecane to hydroperoxide was carried out on a fixed-bed reactor after loading Pt. XRD, BET, SEM, TEM and NH3-TPD Molecular sieves and catalysts were investigated.The effects of different Si contents on the hydroisomerization properties of n-octadecane were investigated, and it was found that the optimal ratio of Si / Al was 0.3. The parameters such as reaction temperature, pressure, space velocity and hydrogen- The results showed that the conversion of n-octadecane reached 73.1 at 340 ℃, 3 MPa, the space velocity of 1 h-1 and the volume ratio of hydrogen to oil of 1 000:1 %, Coal-to-gasoline ratio 1.44, and heterogeneous yield 64.2%.