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分别以浸渍法和分步浸渍法制备了Ni/SAPO-11催化剂和Ni-Sn/SAPO-11双金属催化剂,利用XRD、F T-IR、NH_3-TPD、Py-IR、SEM等手段对其进行了表征,考察了Sn含量对分子筛结构和酸性的影响,并以正庚烷临氢异构化为探针反应,考察了Sn含量及反应条件对催化剂临氢异构化性能的影响.结果表明,在我们所考察的Sn含量范围(加入锡含量)内,所制备的催化剂均能保持SAPO-11分子筛晶相,金属Sn均可调节催化剂酸性.加入Sn可以明显提高正庚烷的转化率和异庚烷的选择性,其中,在氢烃比n(H_2)/n(n-C_7H_(16))为14、H_2流速为30m L/min、还原温度为430℃、还原时间为5 h、反应温度为300℃、反应时间为5 h、重时空速(WHSV)为6.8 h-1、反应压力为常压条件下,5%Ni-4%Sn/SAPO-11催化剂的催化性能较佳,其正庚烷转化率可达43%,异庚烷的选择性可达71%.
Ni / SAPO-11 catalyst and Ni-Sn / SAPO-11 bimetallic catalyst were prepared by impregnation method and step impregnation method respectively. XRD, FTIR, NH3-TPD, Py- The effects of Sn content on the structure and acidity of the zeolites were investigated. Hydroisomerization of n-heptane to probe was also investigated. The effects of Sn content and reaction conditions on the hydroisomerization performance of the catalysts were investigated. Results The results showed that the catalyst prepared in the range of Sn content (with tin content) we investigated retained the crystalline phase of SAPO-11 molecular sieve, and the metal Sn could regulate the acidity of the catalyst. The addition of Sn can obviously improve the conversion of n-heptane And isoheptane selectivity, in which the hydrogenation ratio is 14, the flow rate of H 2 is 30 m L / min, the reduction temperature is 430 ℃, and the reduction time is 5 h at a hydrogen ratio of n (H 2) / n (n-C 7 H 16) , The reaction temperature is 300 ℃, the reaction time is 5 h, the WHSV is 6.8 h-1, and the catalytic performance of 5% Ni-4% Sn / SAPO-11 catalyst under normal pressure is better , Its n-heptane conversion rate of up to 43%, iso-heptane selectivity of up to 71%.