改性 SBA-15 以稳定支撑的氧化物

IF 2.5 4区材料科学 Q2 CHEMISTRY, APPLIED Journal of Porous Materials Pub Date : 2024-09-04 DOI:10.1007/s10934-024-01679-5

Ching-Yu Wang, Kai Shen, John M. Vohs, Raymond J. Gorte

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引用次数: 0

摘要

为了稳定通过原子层沉积 (ALD) 沉积的 WO3 薄膜，我们研究了在室温下用食人鱼溶液处理 SBA-15 的效果。通过 X 射线衍射和透射电子显微镜观察发现，对于未改性的 SBA-15，薄膜会在 573 至 773 K 之间从 SBA-15 孔隙结构中迁移出来；但是，在 773 K 时，经过食人鱼处理的样品中的 WO3 仍留在孔隙中。虽然 N2 吸附等温线表明 SBA-15 的孔隙结构不受食人鱼处理的影响，但硅醇含量却增加了，这一点可以从水吸附等温线和硅醇区域的漫反射红外光谱中看出。对 2-丙醇的温度编程解吸结果也表明，经过食人鱼处理的样品中硅烷醇的反应性更强。这些结果证明了 SBA-15 表面改性对制备支撑氧化物催化剂的重要性。

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Modification of SBA-15 for stabilizing supported oxides

The effect of treating SBA-15 with a piranha solution at room temperature was studied for purposes of stabilizing a WO₃ film deposited by Atomic Layer Deposition (ALD). For unmodified SBA-15, the film was found to migrate out of the SBA-15 pore structure between 573 and 773 K; however, WO₃ remained within the pores in piranha-treated samples at 773 K, as demonstrated by X-Ray Diffraction and Transmission Electron Microscopy. Although N₂ adsorption isotherms showed that the pore structure of SBA-15 was unaffected by the piranha treatment, the silanol content increased, as shown by water adsorption isotherms and Diffuse Reflectance Infrared Spectra of the silanol region. Temperature-programmed desorption results for 2-propanol also suggested that the silanols were more reactive in the piranha-treated samples. The results demonstrate the importance of surface modification of SBA-15 for the preparation of supported-oxide catalysts.

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来源期刊

Journal of Porous Materials 工程技术-材料科学：综合

CiteScore

4.80

自引率

7.70%

发文量

203

审稿时长

2.6 months

期刊介绍： The Journal of Porous Materials is an interdisciplinary and international periodical devoted to all types of porous materials. Its aim is the rapid publication of high quality, peer-reviewed papers focused on the synthesis, processing, characterization and property evaluation of all porous materials. The objective is to establish a unique journal that will serve as a principal means of communication for the growing interdisciplinary field of porous materials. Porous materials include microporous materials with 50 nm pores. Examples of microporous materials are natural and synthetic molecular sieves, cationic and anionic clays, pillared clays, tobermorites, pillared Zr and Ti phosphates, spherosilicates, carbons, porous polymers, xerogels, etc. Mesoporous materials include synthetic molecular sieves, xerogels, aerogels, glasses, glass ceramics, porous polymers, etc.; while macroporous materials include ceramics, glass ceramics, porous polymers, aerogels, cement, etc. The porous materials can be crystalline, semicrystalline or noncrystalline, or combinations thereof. They can also be either organic, inorganic, or their composites. The overall objective of the journal is the establishment of one main forum covering the basic and applied aspects of all porous materials.