Journal
JOURNAL OF CATALYSIS
Volume 342, Issue -, Pages 173-183Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2016.07.020
Keywords
HPPO process; Ti-MWW titanosilicate; Propylene oxide; Liquid-phase epoxidation; Fixed-bed reactor
Categories
Funding
- NSFC of China [21533002, 21373089, 21403069]
- China Ministry of Science and Technology [2016YFA0202804]
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The liquid-phase epoxidation of propylene to propylene oxide (PO) over formed titanosilicate catalysts was investigated in a fixed-bed reactor. The effects of reaction temperature, n(C-3(-))/n(H2O2) molar ratio, and weight hourly space velocity (WHSV) of H2O2 or solvent on the catalytic performance of the formed Ti-MWW catalyst have been extensively studied. Adding an appropriate amount of ammonia to the reaction mixture prolonged the catalyst lifetime effectively. The main byproduct of propylene glycol (PG) and other heavy byproducts with high boiling points were deposited inside zeolite micropores, which corresponded to the main reason for the catalyst deactivation. The high-temperature calcination in air recovered readily the reactivity of the deactivated catalyst. Fluorine implantation remarkably enhanced the reactivity and lifetime of the catalyst in the hydrogen peroxide propylene oxide (HPPO) process, exhibiting a PO selectivity of >99%. (C) 2016 Elsevier Inc. All rights reserved.
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