One-Pot Hydrothermal Synthesis of a Dual-Metal-Modified CuMn-ZSM-5/SAPO-34 Zeolite with Excellent MTO Catalytic Performance

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-04-23 DOI:10.1007/s10562-025-05022-8

Wenjie Yao, Lei Chen, Yinzhong Wang, Gang Yang

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Abstract

The composite molecular sieve catalysts with long reaction times were successfully synthesized by introducing Cu²⁺/Mn²⁺ and ZSM-5 into the initial gel. The catalysts were characterized with XRD, SEM and NH₃-TPD, and further investigated through the methanol-to-olefin reactions. The results showed that the addition of Cu²⁺ caused the crystallinity of ZSM-5/SAPO-34 (Z-S) to increase significantly, but with addition of Mn²⁺, the crystallinity gradually decreased. With the increase of the Mn²⁺/Cu²⁺ ratio, the desorption summits of the weak and strong acid sites gradually increased, but the weak acid centres gradually dominated, which is herein thought helped reducing formation of the coke. The designed Cu_0.05-Mn_0.05/Z-S samples showed beneficial catalytic performances with a lifetime of 1500 min, a 1.5-fold increase compared with the Cu_0.05/Z-S, while their selectivities remained exceeding 89%.

Graphical Abstract

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具有优异MTO催化性能的双金属改性CuMn-ZSM-5/SAPO-34沸石的一锅水热合成

通过在初始凝胶中引入Cu2+/Mn2+和ZSM-5，成功合成了反应时间较长的复合分子筛催化剂。采用XRD、SEM和NH3-TPD对催化剂进行了表征，并通过甲醇制烯烃反应进行了进一步的研究。结果表明，Cu2+的加入使ZSM-5/SAPO-34 （Z-S）的结晶度显著提高，但随着Mn2+的加入，结晶度逐渐降低。随着Mn2+/Cu2+比的增大，弱酸和强酸位点的解吸峰逐渐增加，但弱酸中心逐渐占主导地位，这有助于减少焦炭的形成。所设计的Cu0.05- mn0.05 /Z-S样品具有良好的催化性能，其寿命为1500 min，是Cu0.05/Z-S的1.5倍，而其选择性仍然超过89%。图形抽象

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.