Epoxide compounds are ultra-important intermediates for manufacturing a variety of chemical products, yet their industrial preparation still suffers from some non-negligible drawbacks. Herein, novel CoOx nanoparticles dispersed within internal channels...
The oxidative coupling of imines to ketazine with molecular oxygen is a green process towards hydrazine hydrate synthesis, which could efficiently address the environmental and economic issues of the traditional Raschig or peroxide-ketazine process.
The liquid–solid postsynthetic
method is commonly used in
the preparation of metal-containing zeolites, for example, Ti-β
(BEA) zeolite. This paper reports a facile and Ti incorporation improved
liquid–solid impregnation method for Ti-β zeolite preparation
by incorporating a unique Ti precursor, namely, partially ethoxylated
chlorotitanate (Ti(Cl)4–n
(OEt)
n
), into the defects of dealuminated β
zeolite. The Ti precursor was prepared from the reaction of TiCl4 and ethanol, and its structure was determined by visible
Raman spectroscopy. The Ti species coordination state and distribution
of synthesized Ti-β zeolite were analyzed by UV Raman, XPS,
UV–vis, and TEM EDS mapping. The results suggest that most
of the Ti species were incorporated into the BEA framework tetrahedrally
and dispersed uniformly. The Ti-β zeolite synthesized by the
improved method exhibits higher surface and bulk framework Ti content
(94.4% and 65.3%, respectively) compared with Ti-β zeolites
prepared through hydrothermal synthesis, dry impregnation, and ordinary
liquid–solid impregnation method. Catalytic performance evaluation
results of 1-hexene epoxidation reconfirmed the high framework content
of Ti-β zeolite synthesized by the improved method. The function
mechanism of this unique Ti precursor was provided based on TG-MS
characterization results, and it suggests that Ti precursor with two
types of substitution groups which show different reactivity would
enhance the Ti incorporation into the zeolite framework.
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