Synthesis of SAPO-35 molecular sieves with different structure-directing agents and their catalytic performance in the conversion of methanol to olefins

Q3 Energy

燃料化学学报 Pub Date : 2025-04-01 DOI:10.1016/S1872-5813(24)60488-3

Ni LIANG, Lei KANG, Yujia WANG, Haiyan WANG, Yingzhi BAI, Qiao HAN, Na SUN

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引用次数: 0

Abstract

A series of SAPO-35 molecular sieves with different SiO₂/Al₂O₃ ratios were synthesized by hydrothermal method using hexamethylene imine (HMI) and N-methylpiperidine (NMP) as the structure-directing agent (SDA). The synthesized SAPO-35 molecular sieves were characterized by XRD, SEM, FT-IR, NH₃-TPD, XRF and N₂ sorption and their catalytic performance in the conversion of methanol to olefins (MTO) was comparatively investigated. The results indicated that the crystallinity and acid density of the SAPO-35 molecular sieves increase first and then decrease with the increase of the SiO₂/Al₂O₃ ratio in the initial gel; in particular, the SAPO-35-0.3(HMI) sample with a SiO₂/Al₂O₃ ratio of 0.3 displays a high crystallinity, large surface area and suitable acid distribution as a catalyst in MTO. Compared with the SAPO-35-HMI sample synthesized with HMI as SDA, the SAPO-35-NMP sample having the same SiO₂/Al₂O₃ ratio but synthesized using new NMP as SDA exhibits much better catalytic stability and higher selectivity to light olefins in MTO; the selectivity to ethene + propene reaches 81.3%, where ethene accounts for more than 50%, far surpassing propene.

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不同结构导向剂的SAPO-35分子筛的合成及其催化甲醇制烯烃的性能

以六亚胺（HMI）和n -甲基哌啶（NMP）为结构导向剂（SDA），采用水热法制备了不同SiO2/Al2O3配比的SAPO-35分子筛。采用XRD、SEM、FT-IR、NH3-TPD、XRF和N2吸附等手段对合成的SAPO-35分子筛进行了表征，并比较研究了其催化甲醇制烯烃（MTO）的性能。结果表明：随着初始凝胶中SiO2/Al2O3比例的增加，SAPO-35分子筛的结晶度和酸密度先增大后减小；其中SiO2/Al2O3比为0.3的SAPO-35-0.3（HMI）样品具有较高的结晶度、较大的比表面积和适宜的酸分布等特点。与以HMI为SDA合成的SAPO-35-NMP样品相比，以新NMP为SDA合成的SiO2/Al2O3比相同的SAPO-35-NMP样品在MTO中表现出更好的催化稳定性和对轻烯烃的选择性；对乙烯+丙烯的选择性达到81.3%，其中乙烯占比超过50%，远远超过丙烯。

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来源期刊

燃料化学学报 Chemical Engineering-Chemical Engineering (all)

CiteScore

2.80

自引率

0.00%

发文量

5825

期刊介绍： Journal of Fuel Chemistry and Technology (Ranliao Huaxue Xuebao) is a Chinese Academy of Sciences(CAS) journal started in 1956, sponsored by the Chinese Chemical Society and the Institute of Coal Chemistry, Chinese Academy of Sciences(CAS). The journal is published bimonthly by Science Press in China and widely distributed in about 20 countries. Journal of Fuel Chemistry and Technology publishes reports of both basic and applied research in the chemistry and chemical engineering of many energy sources, including that involved in the nature, processing and utilization of coal, petroleum, oil shale, natural gas, biomass and synfuels, as well as related subjects of increasing interest such as C1 chemistry, pollutions control and new catalytic materials. Types of publications include original research articles, short communications, research notes and reviews. Both domestic and international contributors are welcome. Manuscripts written in Chinese or English will be accepted. Additional English titles, abstracts and key words should be included in Chinese manuscripts. All manuscripts are subject to critical review by the editorial committee, which is composed of about 10 foreign and 50 Chinese experts in fuel science. Journal of Fuel Chemistry and Technology has been a source of primary research work in fuel chemistry as a Chinese core scientific periodical.