Journal
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
Volume 60, Issue 42, Pages 15056-15063Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.iecr.1c02207
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Funding
- National Key R&D Program of China [2019YFC1907602]
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The study showed that serial VPO catalysts with different activation temperatures exhibited varying species proportions and surface properties, with the S-405 catalyst demonstrating the highest conversion and selectivity for n-butane oxidation.
Serial VPO catalysts with different compositions of crystalline phases were prepared at various activation temperatures. The characterization results revealed that the proportion of V5+ species, the acidity levels, and the surface P/V ratios of VPO catalysts showed an increasing tendency with activation temperature. The performances of n-butane oxidation for serial VPO catalysts were tested at different conditions. It was shown that the S-405 catalyst (activated at 405 degrees C) presented the highest conversion of n-butane (75.2%) at a GHSV of 1000 h(-1) and the highest selectivity for maleic anhydride (MA) (68.9%) at a GHSV of 1800 h(-1), which were attributed to S-405's high intensities at different crystalline faces, the highest amount of acidity (5.52 mL/g), the highest number of total removed oxygen atoms (2.88 x 10(21) atom g(-1)), and the best reducibility. In addition, the kinetic and thermodynamic analyses confirmed that the S-405 catalyst possessed the best activity and selectivity of n-butane oxidation, and the effects of Lat-O and Sur-O on the selectivity for MA were also disclosed.
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