Journal
CATALYSIS COMMUNICATIONS
Volume 75, Issue -, Pages 69-73Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2015.12.007
Keywords
Hierarchical TS-1; Intraaystalline voids; Grooves; TPAOH; NaOH
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Hierarchical TS-1 with grooves and intracrystalline voids was prepared by TPAOH/NaOH treatment. With increasing NaOH concentration, the dissolution-recrystallization process was intensified, the relative crystallinity and microporous properties decreased, the secondary pore volume increased. Although the dissolved species could be recrystallized, Na+ prevented the titanium incorporation, which increased the extra-framework titanium content. In phenol hydroxylation, improved activity and H2O2 efficiency were achieved when NaOH was no more than 0.1 mol/L, which may be a result of the positive influences of the secondary pores. At higher NaOH concentration (>0.1 mol/L), the activity and H2O2 efficiency decreased due to the negative influences of the non framework titanium. (C) 2015 Elsevier B.V. All rights reserved.
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