A Modified Two-Step Coprecipitation Method Provides Better CuZnO/Al2O3 Methanol Synthesis Catalyst with More Uniform Distribution of Alumina

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL Catalysis Letters Pub Date : 2024-09-13 DOI:10.1007/s10562-024-04796-7

Qiong Wang, Kang Xiao, Haitao Li, Feng Lu, Quli Fan

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Abstract

A modified two-step coprecipitation method has been formulated to prepare a series of model CuZnO/Al₂O₃ catalysts for methanol synthesis from syngas. Evaluation at industrially relevant condition showed slightly higher activity and much higher stability for model catalysts than for a commercial catalyst. Due to the same CuZn-binary precursor, the model catalysts had similar structural properties with large specific surface area and pore volume, small CuO crystallites and good reducibility, resembling that of the commercial catalyst. However, the model catalysts showed much better uniformity of alumina distribution, which accounted for their better performance. Strong positive correlation between the deactivation rate and the coefficient of variation of Al/Zn indicates the uniformity of alumina distribution plays an important role in determining stability. Specifically, CuZnO/Al₂O₃ catalysts with alumina distributed more uniformly had higher stability. This work demonstrated that the formulated modified two-step coprecipitation could provide excellent CuZnO/Al₂O₃ catalysts for industrial applications. Additionally, it also affords new clues for the development of even better industrial catalysts.

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改进的两步共沉淀法可提供更好的 CuZnO/Al2O3 甲醇合成催化剂，且氧化铝分布更均匀

通过改良的两步共沉淀法制备了一系列模型 CuZnO/Al2O3 催化剂，用于从合成气中合成甲醇。在工业相关条件下进行的评估表明，与商用催化剂相比，模型催化剂的活性略高，稳定性也高得多。由于采用了相同的铜锌二元前驱体，模型催化剂具有与商用催化剂相似的结构特性，比表面积和孔隙率大，CuO 结晶小，还原性好。不过，模型催化剂的氧化铝分布均匀性更好，因此性能更佳。失活率与 Al/Zn 变化系数之间的强正相关性表明，氧化铝分布的均匀性在决定稳定性方面起着重要作用。具体而言，氧化铝分布更均匀的 CuZnO/Al2O3 催化剂具有更高的稳定性。这项研究表明，改良的两步共沉淀配方可为工业应用提供优良的 CuZnO/Al2O3 催化剂。此外，它还为开发更好的工业催化剂提供了新的线索。

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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.