期刊
CHEMICAL ENGINEERING JOURNAL
卷 389, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2020.124384
关键词
Cr-based catalysts; Support effects; Metal-support interactions; Methyl mercaptan
资金
- National Natural Science Foundation of China [21667016, U1402233, 21767016, 21267011]
Chromium (Cr) species with different loading (1, 2.5, 5, 7.5 and 10 wt%) were impregnated over alumina (Al2O3) and silica (SiO2) supports to investigate the effects of the metal-support interactions on decomposing methyl mercaptan. The characterization results revealed that the amount and nature of surface hydroxyl groups of support (Al-OH and Si-OH) induce the different interactions between chromium species and support, which generates an exceeding support-dependent dispersion, oxidation states, reducibility, and acid-base properties for the prepared Cr-based catalysts. As compared with SiO2 support, Al2O3-supported chromium catalysts with evenly dispersed monochromatic Cr(VI) species exhibited excellent catalytic activity by means of theirs enhanced reducibility and sufficient acid-basic sites. Therefore, it is concluded that the metal-support interactions can be tailored by engineering the amount and nature of hydroxyl groups on the support.
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