表面性质对铈催化剂以二氧化碳和甲醇为原料合成碳酸二甲酯的影响机理研究

IF 15.7 1区 化学 Q1 CHEMISTRY, APPLIED Chinese Journal of Catalysis Pub Date : 2024-10-01 DOI:10.1016/S1872-2067(24)60091-4
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引用次数: 0

摘要

以二氧化碳和甲醇为原料直接合成碳酸二甲酯(DMC)作为一种对环境无害且可替代传统工艺的方法备受关注。本文采用一锅合成法制备了一系列具有不同质构特征和表面性质的氧化铈催化剂,用于以二氧化碳和甲醇为原料直接合成碳酸二甲酯(DMC),并详细研究了其结构-性能关系。表征结果表明,随着煅烧温度的升高,表面酸碱性质和氧空位含量都随着结晶度的升高而降低,同时催化剂上的 DMC 产率出现了意想不到的火山状变化趋势。原位漫反射红外傅立叶变换光谱(DRIFTS)研究表明,甲醇的吸附速率比 CO2 慢,甲醇的活化状态在很大程度上影响了关键中间产物的形成。虽然低温煅烧带来的表面酸碱性和氧空位的增强有利于 CO2 的活化,但低结晶度样品上过量强碱性位点的存在不利于 DMC 的合成,因为这些位点会优先形成无反应的单/多齿碳酸盐,并进一步阻碍甲醇的活化。此外,在使用 2-氰基吡啶作为脱水试剂时,发现 DMC 的合成既受到快速原位脱水的促进作用的影响,也受到水合产物竞争性吸附在同一活性位点上的抑制作用的影响。
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Mechanism study on the influence of surface properties on the synthesis of dimethyl carbonate from CO2 and methanol over ceria catalysts
The direct synthesis of dimethyl carbonate (DMC) from CO2 and methanol has attracted much attention as an environmentally benign and alternative route for conventional routes. Herein, a series of cerium oxide catalysts with various textural features and surface properties were prepared by the one-pot synthesis method for the direct DMC synthesis from CO2 and methanol, and the structure-performance relationship was investigated in detail. Characterization results revealed that both of surface acid-base properties and the oxygen vacancies contents decreased with the rising crystallinity at increasingly higher calcination temperature accompanied by an unexpectedly volcano-shaped trend of DMC yield observed on the catalysts. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) studies indicated that the adsorption rate of methanol is slower than that of CO2 and the methanol activation state largely influences the formation of key intermediate. Although the enhanced surface acidity-basicity and oxygen vacancies brought by low-temperature calcination could facilitate the activation of CO2, the presence of excess strongly basic sites on low-crystallinity sample was detrimental to DMC synthesis due to the preferred formation of unreactive mono/polydentate carbonates as well as the further impediment of methanol activation. Moreover, with the use of 2-cyanopyridine as a dehydration reagent, the DMC synthesis was found to be both influenced by the promotion from the rapid in situ removal of water and the inhibition from the competitive adsorption of hydration products on the same active sites.
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来源期刊
Chinese Journal of Catalysis
Chinese Journal of Catalysis 工程技术-工程:化工
CiteScore
25.80
自引率
10.30%
发文量
235
审稿时长
1.2 months
期刊介绍: The journal covers a broad scope, encompassing new trends in catalysis for applications in energy production, environmental protection, and the preparation of materials, petroleum chemicals, and fine chemicals. It explores the scientific foundation for preparing and activating catalysts of commercial interest, emphasizing representative models.The focus includes spectroscopic methods for structural characterization, especially in situ techniques, as well as new theoretical methods with practical impact in catalysis and catalytic reactions.The journal delves into the relationship between homogeneous and heterogeneous catalysis and includes theoretical studies on the structure and reactivity of catalysts.Additionally, contributions on photocatalysis, biocatalysis, surface science, and catalysis-related chemical kinetics are welcomed.
期刊最新文献
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