Optimization of the Pore Structure of Spherical Alumina by Crosslinking Polymerization Technology

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL Catalysis Letters Pub Date : 2025-04-22 DOI:10.1007/s10562-025-05030-8

Jiale Li, Xingye Lin, Guandong Wu, Xijia Sun, Yufei He, Dianqing Li

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Abstract

It is crucial to enlarge the pore size of spherical alumina while maintaining its high mechanical strength. In this work, acrylamide, maleimide and phenol were introduced as cross-linker into Al sol to prepare spherical alumina supports by the oil-drop method. By conducting crosslinking polymerization reactions using these cross-linkers with formaldehyde, the consumption of formaldehyde reduces its evaporation and thereby minimizes the disruption to the pore structure of the spherical alumina prepared by the oil-drop method. As a result, the pore structure of the spherical alumina is optimized from wedge-shaped pores to interconnected pores, with the proportion of pores in the range of 25–40 nm increasing by ~ 10% while maintaining strength exceed 60 N/P. This pore structure optimization effectively alleviates the reduction in catalytic activity caused by mass transfer limitations, the H₂O₂ productivity of the Pd/Al₂O₃-PH-3% (3% phenol as cross-linker) catalyst increased by 9.3% compared to that of Pd/Al₂O₃ without cross-linker.

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用交联聚合技术优化球形氧化铝的孔隙结构

在保持高机械强度的同时扩大球形氧化铝的孔径是至关重要的。本研究将丙烯酰胺、马来酰亚胺和苯酚作为交联剂引入到Al溶胶中，采用油滴法制备球形氧化铝载体。通过使用这些交联剂与甲醛进行交联聚合反应，甲醛的消耗减少了其蒸发，从而最大限度地减少了对油滴法制备的球形氧化铝孔隙结构的破坏。结果表明，球形氧化铝的孔隙结构由楔形孔优化为连通孔，在25 ~ 40 nm范围内的孔隙比例增加了~ 10%，同时强度保持在60 N/P以上。这种孔结构优化有效地缓解了传质限制导致的催化活性降低，Pd/Al2O3- ph -3%（3%苯酚为交联剂）催化剂的H2O2产率比未添加交联剂的Pd/Al2O3催化剂提高了9.3%。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.