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题名: Hydroisomerization of n-hexadecane on zeolite catalysts
作者: Huang, WG;  Li, DD;  Shi, YH;  Kang, XH;  Meng, XB;  Wang, K;  Dong, WZ;  Nie, H;  Li, C
关键词: platinum ;  zeolite ;  alumina ;  n-hexadecane ;  hydroisomerization ;  reaction mechanism
刊名: CHINESE JOURNAL OF CATALYSIS
发表日期: 2003-09-01
卷: 24, 期:9, 页:651-657
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Applied ;  Chemistry, Physical ;  Engineering, Chemical
研究领域[WOS]: Chemistry ;  Engineering
英文摘要: Hydroisomerization of n-hexadecane on zeolite catalysts was studied and the reaction mechanism was discussed, which may provide new clues to developing hydroisomerization catalysts with high selectivity. The catalysts were prepared as follows: zeolite and alumina were mixed and then extruded to make a support, after drying and calcination, platinum was loaded on by wet impregnation with Pt(NH3)(4)Cl-2 solution. The hydroisomerization of n-hexadecane was carried out in a continuous fixed-bed reactor with down-flow. The catalysts were loaded in the reactor and reduced for 4 h. Then n-hexadecane was pumped into the reactor at different temperatures. The reaction results indicated that Pt/MCM-22 and Pt/ZSM-5 catalysts show higher activity but lower selectivity than Pt/Hbeta and Pt/SAPO-11 catalysts. The selectivity of Pt/SAPO-11 is the highest, more than 90% at the conversion of 80%. From the cracked product distribution, it could be seen that, for Pt/ZSM-5 and Pt/Hbeta, the fractions of small molecule products, such as C-3, C-4 and C-5, are more than those of long chain products, but for Pt/SAPO-11, the cracked product distribution is nearly symmetrical, which means that there is secondary cracking occurred for Pt/ZSM-5 and Pt/Hbeta but no for Pt/SAPO-11. The symmetrical distribution of cracked products is the characteristics of large-pore zeolites or amorphous catalysts, so it can be concluded that the hydroisomerization takes place on the external surface or at the pore mouth of SAPO-11, but not in the pore channel. The different zeolites showed different behavior for the isomerization, which can be attributed to their different acidity. The strong acidity of MCM-22 and ZSM-5 leads to poor isomerization selectivity. SAPO-11 has high selectivity, indicating that the weak and mild acids are favorable to the isomerization.
关键词[WOS]: ALUMINOPHOSPHATE MOLECULAR-SIEVES ;  KEY-LOCK CATALYSIS ;  PORE MOUTH ;  TON-TYPE ;  HYDROCRACKING ;  HYDROCONVERSION ;  ALKANES ;  ACIDITY ;  DECANE ;  ISOMERIZATION
语种: 英语
WOS记录号: WOS:000185982100005
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138220
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.SINOPEC, Res Inst Petr Proc, Beijing 100083, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Huang, WG,Li, DD,Shi, YH,et al. Hydroisomerization of n-hexadecane on zeolite catalysts[J]. CHINESE JOURNAL OF CATALYSIS,2003,24(9):651-657.
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