1997
DOI: 10.1107/s0021889897002410
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Structure of ZrO2SiO2 Gels

Abstract: AbstractxZrO2(l -x)SiO2 gels have been prepared by hydrolytic polycondensation of tetraethylorthosilicate and zirconium n-propoxide in alcohol solution (x-0.1-0.5). The formation of the gels has been investigated in situ by conventional small-angle X-ray scattering. (SAXS) experiments. Primary particles of size 1-2 nm have been found in all hydrogels at the first stage of the gelation process. With further progress of the gelation, the primary particles have been found to aggregate into secondary clusters with… Show more

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Cited by 7 publications
(10 citation statements)
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“…Once the primary particles have been formed, the generation of a large pore system (see below) should be a consequence of their aggregation, which mainly implies the establishment of Si–O–Si interparticle covalent links (which might be kinetically favored in the presence of Zr IV ) 43. Moreover, as occurs in the case of xerogels, the presence of Zr favors the interparticle condensation reactions and leads to clusters more dense than those originated by the analogous pure silica derivatives 14. This behavior may be attributed to the development of cross‐linking through Zr centers between individual particles (Zr–O–Si or Zr–O–Zr bridges), as expected from the affinity of Zr atoms for higher oxygen coordination environments.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Once the primary particles have been formed, the generation of a large pore system (see below) should be a consequence of their aggregation, which mainly implies the establishment of Si–O–Si interparticle covalent links (which might be kinetically favored in the presence of Zr IV ) 43. Moreover, as occurs in the case of xerogels, the presence of Zr favors the interparticle condensation reactions and leads to clusters more dense than those originated by the analogous pure silica derivatives 14. This behavior may be attributed to the development of cross‐linking through Zr centers between individual particles (Zr–O–Si or Zr–O–Zr bridges), as expected from the affinity of Zr atoms for higher oxygen coordination environments.…”
Section: Resultsmentioning
confidence: 99%
“…This results in an interparticle shrinkage similar to that observed in xerogels. [14] These tendencies can be better appreciated by comparing a pure UVM-7 silica with a Zr-containing derivative (Figure 2). The micrographs in Figure 2 clearly show how the incorporation of Zr atoms also involves a change in the particle morphology.…”
Section: Characterizationmentioning
confidence: 99%
“…Zirconia−silica materials have attracted much attention in recent years because of their interesting properties for applications in heterogeneous catalysis, photocatalysis, and ceramic glasses. ZrO 2 −SiO 2 mixed oxides are very important materials with excellent chemical resistance to alkaline corrosion and low thermal expansions. ZrO 2 −SiO 2 mixed oxides display strong surface acidity and have been applied for reactions including alcohol dehydration, , alkene isomerization, and cumene dealkylation . ZrO 2 /SiO 2 -supported oxides exhibit hydrogenation activity and have been tested in propene hydrogenation …”
Section: Introductionmentioning
confidence: 99%
“…To match the precursors reactivity [16], the silica solution was pre-hydrolyzed in acidic conditions [17] …”
Section: Methodsmentioning
confidence: 99%