A. STEPANOV A, M. VELICHKINA L, L. KOROBITSYNA L, K. ALTUNINA L
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The strength of the acid centres of unmodified samples, depending on the structure-forming additive, decreases in the series: DES > CA > PER, and the concentration of acid centres of both types, on the contrary, decreases for zeolites in the series: PER > CA > DES. The catalytic activity of synthesized zeolites has been studied in the processes of non-oxidative methane conversion and refining of the straight-run gasoline fraction of oil. The dependence of the activity and stability of samples on their physicochemical properties caused by the template nature is determined. It has been shown that zeolite synthesized using DES and the 4.0%Mo/ZSM-5 catalyst obtained on its basis exhibit higher activity and stability in the processes of non-oxidative methane conversion into aromatic hydrocarbons and in upgrading the straight-run gasoline fraction of oil, in comparison with zeolite-based catalysts obtained using PER or CA.","PeriodicalId":44968,"journal":{"name":"Chemistry for Sustainable Development","volume":"23 9","pages":""},"PeriodicalIF":0.4000,"publicationDate":"2024-06-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"INVESTIGATION OF THE PHYSICOCHEMICAL AND CATALYTIC PROPERTIES OF MFI TYPE ZEOLITES SYNTHESIZED USING DEEP EUTECTIC SOLVENT\",\"authors\":\" A. STEPANOV A, M. VELICHKINA L, L. KOROBITSYNA L, K. 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引用次数: 0
摘要
使用季戊四醇(PER)、碳酰胺(CA)或深共晶溶剂(DES)(PER 和 CA 的二元混合物)作为模板合成了结构类型为 ZSM-5 的沸石。红外光谱和 X 射线衍射分析表明,合成沸石所用模板的性质会影响所得样品的相纯度和结晶度。研究了沸石以及用沸石与纳米级钼粉干法机械混合制备的含钼催化剂的质地和酸性。研究表明,沸石的质地特性取决于模板的性质。CA 的使用有助于获得比表面积和孔隙率最大的沸石。未改性样品的酸中心强度随结构形成添加剂的不同而降低:DES>CA>PER,相反,两种类型的酸中心浓度在沸石系列中都会降低:PER>CA>DES。在甲烷的非氧化转化和石油直馏汽油馏分的精炼过程中,对合成沸石的催化活性进行了研究。研究确定了样品的活性和稳定性与其由模板性质引起的物理化学特性之间的关系。结果表明,与使用 PER 或 CA 合成的沸石基催化剂相比,使用 DES 合成的沸石和在其基础上获得的 4.0%Mo/ZSM-5 催化剂在将甲烷非氧化转化为芳香烃和提炼石油直馏汽油馏分的过程中表现出更高的活性和稳定性。
INVESTIGATION OF THE PHYSICOCHEMICAL AND CATALYTIC PROPERTIES OF MFI TYPE ZEOLITES SYNTHESIZED USING DEEP EUTECTIC SOLVENT
Zeolites of the structural type ZSM-5 were synthesized using a template, which was pentaerythritol (PER), carbamide (CA), or a deep eutectic solvent (DES) - a binary mixture of PER and CA. It is determined by IR spectroscopy and X-ray diffraction analysis that the nature of the templates used in the synthesis of zeolites affects the phase purity and the degree of crystallinity of the obtained samples. The textural and acidic properties of zeolites and Mo-containing catalysts prepared from them by dry mechanical mixing with nanoscale molybdenum powder have been studied. It is shown that the textural properties of zeolites depend on the template nature. The use of CA promoted obtaining the zeolite with maximal specific surface area and pore volume. The strength of the acid centres of unmodified samples, depending on the structure-forming additive, decreases in the series: DES > CA > PER, and the concentration of acid centres of both types, on the contrary, decreases for zeolites in the series: PER > CA > DES. The catalytic activity of synthesized zeolites has been studied in the processes of non-oxidative methane conversion and refining of the straight-run gasoline fraction of oil. The dependence of the activity and stability of samples on their physicochemical properties caused by the template nature is determined. It has been shown that zeolite synthesized using DES and the 4.0%Mo/ZSM-5 catalyst obtained on its basis exhibit higher activity and stability in the processes of non-oxidative methane conversion into aromatic hydrocarbons and in upgrading the straight-run gasoline fraction of oil, in comparison with zeolite-based catalysts obtained using PER or CA.