摘要
以工业Beta沸石为载体,负载不同含量的Pt,得到了不同金属中心/酸中心浓度比(c_(M)/c_(A))的催化剂,对其进行物化表征,并以正庚烷为模型化合物对不同c_(M)/c_(A)催化剂进行异构化反应性能评价。结果表明:Pt粒子均匀地负载在沸石的外表面上,对沸石结构没有影响,酸性略有下降。对于催化剂的正庚烷异构化反应活性,当催化剂c_(M)/c_(A)小于0.037时,反应过程由金属中心数量控制,产生大量多支链异构体产物和裂化产物;当c_(M)/c_(A)大于0.285时,反应过程由酸中心数量控制,有氢解反应发生。在反应压力为0.4 MPa、反应温度为207℃、质量空速为1.0 h^(-1)、氢/烃摩尔比为5、催化剂质量为1.0 g的条件下,当催化剂c_(M)/c_(A)为0.266、正庚烷转化率为70.75%时,异构体总选择性为95.14%,总收率为67.31%,其中多支链异构体收率为15.63%,裂化产物收率低于5%。
Industrial Beta zeolite was used as raw material and loaded with different contents of Pt to achieve the catalysts with various metal center/acid center concentration ratios(c_(M)/c_(A)),and their physicochemical properties were characterized;the hydroisomerization reactions of different c_(M)/c_(A) catalysts were evaluated using n-heptane as a model compound.The results show that Pt particles are uniformly loaded on the external surface of zeolite,which have no effects on the structure of zeolite,and the acidity of the loaded samples is decreased slightly.For the n-heptane isomerization reaction activity of catalysts,when the c_(M)/c_(A) is less than 0.037,the reaction process is controlled by the amount of metal center,and a large number of multi-branched i-heptane and cracked products are formed.When the c_(M)/c_(A) is greater than 0.285,the reaction process is dominated by the acid center amount,and hydrogenolysis reaction occurs.At the reaction pressure of 0.4 MPa,reaction temperature of 207℃,mass space velocity of 1.0 h^(-1),hydrogen/hydrocarbon molar ratio of 5,catalyst mass of 1.0 g,c_(M)/c_(A) of 0.266 and n-heptane conversion rate of 70.75%,the total selectivity of isomers is 95.14%;the total yield is 67.31%,of which the yield of multi-branched isomers is 15.63%,and that of cracking products is less than 5%.
作者
郭凯
马爱增
罗一斌
王子健
邢恩会
李金芝
李大东
GUO Kai;MA Aizeng;LUO Yibin;WANG Zijian;XING Enhui;LI Jinzhi;LI Dadong(SINOPEC Research Institute of Petroleum Processing Co.,Ltd.,Beijing 100083,China)
出处
《石油学报（石油加工）》
EI
CAS
CSCD
北大核心
2024年第1期12-22,共11页
Acta Petrolei Sinica(Petroleum Processing Section)
基金
中国石油化工股份有限公司项目(ST22038)基金资助。
