不同改性ZSM-5分子筛负载Ni催化剂上1-庚烯芳构化和异构化性能研究 |
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引用本文: | 宋烨,林伟,田辉平,龙军.不同改性ZSM-5分子筛负载Ni催化剂上1-庚烯芳构化和异构化性能研究[J].石油炼制与化工,2016,47(8):1-6. |
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作者姓名: | 宋烨 林伟 田辉平 龙军 |
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作者单位: | 中国石化石油化工科学研究院 |
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摘 要: | 以磷改性ZSM-5分子筛(ZSM-5-P)、磷和铁改性ZSM-5分子筛(ZSM-5-P-Fe)、未改性NaZSM-5分子筛和无定形SiO2为载体,通过浸渍法制备了Ni/ZSM-5-P,Ni/ZSM-5-P-Fe,Ni/NaZSM-5,Ni/SiO2催化剂,采用N2吸附-脱附、X射线衍射、NH3-TPD、H2-TPR以及吡啶吸附-脱附红外光谱等手段对催化剂进行表征,并在催化加氢脱硫反应条件下,考察了1-庚烯在上述催化剂作用下的芳构化和异构化反应性能。结果表明:Ni/ZSM-5-P-Fe和Ni/ZSM-5-P比Ni/NaZSM-5具有更高的催化反应活性,其异构化产品、芳烃及气体收率明显增加;Ni/ZSM-5-P-Fe具有较多的中强酸活性中心和B酸中心,在该催化剂作用下1-庚烯具有较高的异构化和芳构化反应性能,说明B酸中心能较好地促进1-庚烯异构化和芳构化反应的进行,在一定强度的酸中心和金属中心协同作用下1-庚烯芳构化及异构化反应效率最高。
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关 键 词: | 改性ZSM-5 1-庚烯 异构化 芳构化 辛烷值 脱硫技术 |
收稿时间: | 2015-12-04 |
修稿时间: | 2016-04-13 |
STUDY OF AROMATIZATION AND ISOMERIZATION OF 1-HEPTENE OVER DIFFERENT MODIFIED ZSM-5 ZEOLITE-SUPPORTED Ni CATALYSTS |
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Abstract: | The aromatization and isomerization performance of 1-heptene over Ni/SiO2, Ni/NaZSM-5, Ni/ZSM-5-P and Ni/ZSM-5-P-Fe was investigated at the conditions of catalytic hydrodesulfurization (T = 673 K, P = 1.5 MPa, WHSV = 5 h-1). The catalysts were prepared by loading nickel on the carriers by spraying method and were characterized by XRD, XRF, N2 adsorption-desorption and NH3-TPD, H2-TPR, and pyridine-FTIR techniques. The product distributions show that Ni/ZSM-5-P-Fe and Ni/ZSM-5-P exhibit a remarkable enhancement of aromatization and isomerization of 1-heptene compared with that of Ni/ZSM-5, resulting in increased yields of isomerized product, aromatics, and dry gas. The performance of Ni/ZSM-5-P-Fe is even better because it has more mid-strong acid center and Bronsted acid, indicating that the Bronsted acid promotes the aromatization and isomerization of 1-heptene. It is concluded that the synergetic effect of metallic active sites and appropriate acid sites on the bifunctional catalysts is in favor of the aromatization and isomerization of 1-heptene. |
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Keywords: | modified ZSM-5 1-heptene isomerization aromatization RON desulfurization technology |
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