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Cited by 56 publications
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References 5 publications
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“…Similar observation is described for the silica oxide [33]. In our case, upon further calcination, these fragments are not dehydrated, while the OH groups are dehydrogenated, that also reduces a likelihood of broken bonds at the Zr atom (or, by other words, a quantity of the paramagnetic Zr 3+ centers).…”
Section: Discussionsupporting
confidence: 78%
See 1 more Smart Citation
“…Similar observation is described for the silica oxide [33]. In our case, upon further calcination, these fragments are not dehydrated, while the OH groups are dehydrogenated, that also reduces a likelihood of broken bonds at the Zr atom (or, by other words, a quantity of the paramagnetic Zr 3+ centers).…”
Section: Discussionsupporting
confidence: 78%
“…It was shown, that a substitution of the OH groups by the fluoride blocks the vacancies formation by such a mechanism, since a desorption of the fluoride occurs at higher temperatures. In addition, the fluoride ions cause enough strong inductive effect resulted in weakening of the basic hydroxyl groups at neighboring Zr atoms and increasing the proton mobility, similar to that described for silica oxide [31,33]. As a result, further calcinations of these fragments resulted in the OH groups dehydrogenation, but dehydration.…”
Section: Discussionmentioning
confidence: 73%
“…Ti/FSM-16 (1.0 wt % as TiO 2 ) was prepared by impregnating FSM-16 with an aqueous titanium ammonium oxalate solution. The fluorination of the Ti/FSM-16 catalysts was carried out by a procedure previously reported . The FSM-16 was immersed in 12.5% and 25.0% ammonium fluoride solution for 2 h, dried, heated at a rate of 10 K/min to 973 K, and kept at 973 K for 5 h. The TiO 2 powder catalysts (JRC-TIO-4: anatase 92%, rutile 8%) were supplied by the Catalysis Society of Japan.…”
Section: Methodsmentioning
confidence: 99%
“…Little, Klauser, and Amberg (3) first showed that the glass could isomerize and polymerize certain hydrocarbons and associated this ability with the small quantities of other oxides such as AI,O3, ZrO,, and B,03, which are present in the glass. Chapman and Hair (4) found that when some of the surface hydroxyl groups were replaced by fluorine atoms the ability of the glass t o crack cumene was greatly enhanced. This was attributed to the electronegative fluorine atoms which increased the acidity of the neighboring hydroxyl groups, i.e.…”
Section: Introductionmentioning
confidence: 99%