Hydroconversion of Guaiacol Family Molecules Over Platinum Catalysts Based on Porous Aromatic Frameworks

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL Catalysis Letters Pub Date : 2024-08-14 DOI:10.1007/s10562-024-04793-w

Leonid A. Kulikov, Maria A. Bazhenova, Iuliia S. Bolnykh, Anton L. Maximov, Eduard A. Karakhanov

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Abstract

In this work hydrodeoxygenation of various lignin-derived model compounds and their mixture was studied over platinum catalysts based on porous aromatic frameworks (PAF) doped with Bronsted acid sites. Two catalysts, Pt-PAF-30-SO₃H(5.0) and Pt-PAF-30-SO₃H(7.5), with almost identical platinum loading of 5.1 and 4.7 wt. % but different sulfur concentration of 4.46 and 6.96 wt. % respectively, were synthesized using a method that allows to obtain highly uniform distribution of nanoparticles in the porous structure of the support. The HDO reaction pathways of lignin substrates with different structures were discussed, and the influence of the platinum source chosen for the synthesis of the catalyst on the activity and the selectivity of the latter was studied. We have demonstrated high stability of catalyst (for at least a 7 h reaction) and have confirmed the great activity of the Pt-PAF-30-SO₃H(7.5) catalyst in HDO reactions with a large number of lignin bio-oil model compounds. Pt-PAF-30-SO₃H(7.5) was also tested in the hydrodeoxygenation of a model mixture of aromatic substrates taken in proportions contained in lignin bio-oil. The selectivity to naphthenic hydrocarbons—products of the complete hydrodeoxygenation—was 54%.

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基于多孔芳香族框架的铂催化剂对愈创木酚家族分子的加氢转化

本研究以掺杂了布郎斯特德酸位点的多孔芳香族框架 (PAF) 为基础，研究了各种木质素衍生模型化合物及其混合物在铂催化剂上的加氢脱氧反应。采用一种可使纳米颗粒在载体的多孔结构中高度均匀分布的方法合成了两种催化剂，Pt-PAF-30-SO3H(5.0) 和 Pt-PAF-30-SO3H(7.5)，它们的铂载量几乎相同，分别为 5.1 和 4.7 wt.%，但硫浓度不同，分别为 4.46 和 6.96 wt.%。我们讨论了不同结构的木质素底物的 HDO 反应途径，并研究了合成催化剂时选择的铂源对后者的活性和选择性的影响。我们证明了催化剂的高稳定性（至少反应 7 小时），并证实了 Pt-PAF-30-SO3H(7.5) 催化剂在与大量木质素生物油模型化合物的 HDO 反应中具有极高的活性。此外，还测试了 Pt-PAF-30-SO3H(7.5) 在按木质素生物油所含比例制备的芳香族底物模型混合物中的加氢脱氧反应。对完全加氢脱氧生成的环烷烃的选择性为 54%。

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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.