摘要
采用共浸渍法制备了不同Ce含量改性的Ce-Pt/Hβ-HZSM-5异构化催化剂。通过BET,XRD,NH_3-TPD,Py-IR,TEM等手段对催化剂试样进行了表征,在固定床微反装置上考察了催化剂对正己烷的异构化反应活性。实验结果表明,稀土助剂Ce的引入导致催化剂的比表面积和孔体积降低,B酸量和总酸量增加,活性Pt物种的分散性得到改善,优化了催化剂的正己烷异构化性能。在反应压力1.5 MPa、体积空速1 h^(-1)、氢油体积比500、反应温度280℃的条件下,Ce含量1%(w)、Pt含量0.4%(w)的Ce-Pt/Hβ-HZSM-5催化剂活性最高,正己烷转化率为81.90%,异构化率为81.78%。
Ce modified Pt/Hβ-HZSM-5 catalysts were prepared through co-impregnation and characterized by means of BET, XRD, NH3-TPD, Py-IR and TEM. The catalytic performances of the prepared catalysts in the isomerization of n-hexane were evaluated in a fixed-bed micro-reactor. The results showed that, the introduction of Ce led to the BET specific surface area and pore volume of the catalysts decreasing, and the Br/Snsted acidic sites and total acidity of the catalysts increasing. And the addition of Ce improved the dispersity of the Pt species and the performances of the catalysts in the isomerization. Under the optimal conditions of reaction pressure 1.5 MPa, LHSV 1 h^-1, V（H2） ： V（oil） 500, reaction temperature 280 ℃ and Ce-Pt/Hβ-HZSM-5 with Ce content of 1%（w） and Pt content of 0.4%（w） as the catalyst, the conversion of n-hexane and the isomerization rate reached 81.90% and 81.78%, respectively.
作者
张孔远
崔程鑫
赵兴涛
杨志超
刘晨光
Zhang Kongyuan Cui Chengxin Zhao Xingtao Yang Zhichao Liu Chenguang(StateKeyLaboratoryofHcavyOilProcessing, KeyLaboratoryofCatalysisofCNPC, China University ofPetroleum （EastChina） Qingdao Shandong 266580, Chin)
出处
《石油化工》
CAS
CSCD
北大核心
2017年第5期524-529,共6页
Petrochemical Technology
