摘要
Ni_2P/Al_2O_3-SAPO-11催化剂用于催化重整过程易于积炭失活。通过与Ni_2P/Al_2O_3、Pt/Al_2O_3-SAPO-11及Ni/Al_2O_3-SAPO-11催化剂表面积炭行为对比,研究了该催化剂表面的积炭规律。以甲基环戊烷为积炭前驱物,在不同温度下进行加速积炭实验,采用热重-差示热分析表征催化剂表面积炭位置,并以环己烷、正庚烷为模型化合物对积炭前后催化剂进行脱氢-异构反应催化性能评价。结果表明,由于P原子的作用,Ni_2P/Al_2O_3-SAPO-11重整催化剂具备一定的抗积炭性能,其积炭形成速率介于Pt/Al_2O_3-SAPO-11和Ni/Al_2O_3-SAPO-11催化剂之间;积炭在Ni_2P/Al_2O_3-SAPO-11重整催化剂金属活性中心上形成后,逐步迁移到酸性载体上形成聚合度更高的积炭,并且酸性载体上的积炭是催化剂失活的主导因素。
Ni2P/AI2O3-SAPO-1 catalyst was easily deactivated because of coke in catalytic reforming process. The carbon deposition rule was studied by the comparison with Ni2P/A1203, Pt/AI203-SAPO-11 and Ni2P/AI2O3-SAPO-1 Methylcyclopentane was used as the coke precursors in accelerating coke experiment. TG-DTA was used to study the location of coke on the catalyst surface. The dehydrogenation and isomerism activity of the catalysts were measured with cyclohexane and n-heptane as feeds. The results showed that Ni2P/A12Oa-SAPO-11 reforming catalyst showed anti-carbon performance due to the action of P atom. The coke formation rate of Ni2P/A1203-SAPO-11 was between those of Pt/A12O3-SAPO-11 and Ni/Al2O3-SAPO-11. At first, coke was formed on the metal center of Ni2P/A12Oa-SAPO-11, and then gradually moved to the support to form the coke with higher degree of polymerization, which is the primary factor in the deactivation of Ni2P/AI2O3-SAPO-11catalyst.
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2015年第6期1288-1293,共6页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
中国石油天然气集团公司科技开发项目(2012B-2305-02)资助
