Citrate Impregnation Solutions for the Preparation of Co-Mo/Ni-Mo Hydrotreating Catalysts: How Does Citric Acid Concentration Affect Solution Stability and Catalyst Performance

IF 2.5 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2026-10-01 DOI:10.1007/s10562-026-05535-w

Sergey V. Budukva, Mikhail V. Parfenov, Mikhail E. Revyakin, Evgenii A. Suprun, Elizaveta S. Bykova, Daria D. Uvarkina, Maxim O. Kazakov

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Abstract

This work investigates the stability of concentrated citrate-based Co-Mo and Ni-Mo impregnation solutions used for hydrotreating catalyst preparation, with particular emphasis on the composition and catalytic consequences of precipitates formed unintentionally at insufficient citric acid concentrations. The samples were characterized using a variety of techniques, including XRD, IR spectroscopy, SEM, EDS, and XPS. It was found that the dominant compounds in the precipitates are Anderson-type heteropoly compounds. The results show that Ni–Mo citrate solutions predominantly form Anderson-type ammonium 6-molybdonickelate, whereas Co-Mo citrate solutions form sparingly soluble polymolybdates in the absence of alumina and Anderson-type (ammonium 6-molybdocobaltate and ammonium 6-molybdoaluminate) heteropoly compounds upon contact with γ-Al₂O₃. Catalytic activity was evaluated in the hydrotreating of SRGO. Hydrotreating tests showed that the precipitated heteropoly compounds are transformed during sulfidation into sulfide species and may contribute to the overall HDS performance. Therefore, the higher activity observed for catalysts prepared with precipitate formation is mainly attributed to increased actual metal loading.

Graphical Abstract

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柠檬酸浸渍制备Co-Mo/Ni-Mo加氢催化剂：柠檬酸浓度对溶液稳定性和催化剂性能的影响

本研究研究了用于加氢处理催化剂制备的浓柠檬酸基Co-Mo和Ni-Mo浸渍溶液的稳定性，特别强调了在柠檬酸浓度不足时无意形成的沉淀物的组成和催化后果。采用XRD、IR、SEM、EDS、XPS等多种技术对样品进行了表征。结果表明，沉淀中的主要化合物为anderson型杂多化合物。结果表明，Ni-Mo柠檬酸盐溶液主要形成安德森型6-钼酸铵，而Co-Mo柠檬酸盐溶液在不含氧化铝的情况下形成少溶多钼酸盐，与γ-Al2O3接触后形成安德森型（6-钼钴酸铵和6-钼铝酸铵）杂多化合物。对SRGO加氢处理的催化活性进行了评价。加氢处理试验表明，沉淀的杂多化合物在硫化过程中转化为硫化物，可能有助于HDS的整体性能。因此，通过沉淀形成制备的催化剂的较高活性主要归因于实际金属负载的增加。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.