Liquid-Phase Oxidation of Cyclohexane by Cr/Ti-MWW Zeolite Catalysts for KA Oil Synthesis

IF 2.3 4区 化学 Q3 CHEMISTRY, PHYSICAL
Ximin Wang, Guiying Wu, Siyi Wang, Zhongman Liang, Shengdong Zhu, Fang Jin
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引用次数: 0

Abstract

The mixed systems of cyclohexanol and cyclohexanone (commonly known as KA oil) are key precursors for the synthesis of caprolactam and adipic acid.The atom planting (AP) and impregnation methods has been used to introduce Ti and Cr sequentially into deboronated MWW zeolite catalysts for cyclohexane liquid-phase oxidation, and high KA oil selectivity was obtained. The highly dispersed Cr species as the active site for cyclohexane oxidation were made by introduction of tetra-coordinated Ti species into the zeolite skeleton through the AP method. The catalysts were characterized using XRD, FT-IR, UV-Vis, contact angle and other methods. The results show that the hydrophilicity of the zeolites, the polarity of the solvents, and the metal loading have significant effects on the cyclohexane conversion and the selectivity of KA oil. Through continuous optimization of the reaction conditions, cyclohexane conversion and KA oil selectivity of 25.8% and 99.4% were obtained, respectively.

Cr/Ti-MWW沸石催化剂液相氧化环己烷合成KA油
环己醇和环己酮(俗称KA油)的混合体系是合成己内酰胺和己二酸的关键前体。采用原子种植(AP)和浸渍法将Ti和Cr依次引入到波化MWW沸石环己烷液相氧化催化剂中,获得了较高的KA油选择性。通过AP法在沸石骨架中引入四配位的钛,得到了高度分散的Cr作为环己烷氧化的活性位点。采用XRD、FT-IR、UV-Vis、接触角等方法对催化剂进行了表征。结果表明,沸石的亲水性、溶剂的极性和金属负载对KA油的环己烷转化率和选择性有显著影响。通过对反应条件的不断优化,环己烷转化率为25.8%,KA油选择性为99.4%。
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来源期刊
Catalysis Letters
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.
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