《Table 4 Product composition of diff erent adsorbent used model fuel:1-hexene (34.3%) and n-heptane

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《Difunctional Adsorbents Ni/ZnO–HZSM-5 on Adsorption Desulfurization and Aromatization of Olef in Reaction》

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Comparing 1-hexene（34.3%）with 1-pentene（35.0%），the conversion rate of 1-hexene（88.9%）was higher than that of1-pentene（79.4%）at the reaction time of 1.0 h on the Ni/ZnO–HZSM-5-1:1.5，as shown in Table 4.The aromatics yield of 1-hexene was lower than that of 1-pentene，whereas1-hexene exhibited better desulfurization performance than1-pentene，as shown in Fig.3.The results agree with the discussion in Section“Comparison of thiophene desulfurization and aromatization in C 5 olefi ns.”In a word，under good olefi n aromatization，thiophene desulfurization would be weakened.One of the reasons for the weaker aromatization of 1-hexene than 1-pentene is that the pore size of HZSM-5 was fi xed and measured less than 0.45 nm（as shown in Fig.7），and HZSM-5 featured very high selectivity.The fi xed pore resulted in higher molecular volume，causing the more disadvantageous generation of aromatics[29].This result also explains why the predominant aromatichydrocarbons included toluene and xylene rather than the low-molecular-weight benzene or other higher aromatics.A low benzene yield enables the quality of product to meet the strict regulation on benzene content in clean gasoline.Based on the above analysis and olefi n product analysis in Tables 2 and 4，C 5 olefi ns easily generated naphthene，whereas 1-hexene experienced diffi culty in generating the same compound，resulting in almost no naphthene in the product.These fi ndings imply that the reaction mechanism of olefi n aromatization between C 5 and C 6 may be diff erent.