Research output: Contribution to journal › Article › peer-review
Nature of the Active Centers of In-, Zr-, and Zn-Aluminosilicates of the ZSM-5 Zeolite Structural Type. / Zaikovskii, V. I.; Vosmerikova, L. N.; Vosmerikov, A. V.
In: Russian Journal of Physical Chemistry A, Vol. 92, No. 4, 01.04.2018, p. 689-695.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - Nature of the Active Centers of In-, Zr-, and Zn-Aluminosilicates of the ZSM-5 Zeolite Structural Type
AU - Zaikovskii, V. I.
AU - Vosmerikova, L. N.
AU - Vosmerikov, A. V.
PY - 2018/4/1
Y1 - 2018/4/1
N2 - In-, Zr-, and Zn- containing elementoaluminosilicates of ZSM-5 zeolite structural type are synthesized by means of hydrothermal crystallization from alkaline alumina–silica gels. Based on the data of structural morphological studies on the samples, it is established that introducting metals into the zeolite structure leads to the formation of particles different in morphology and elemental composition. Studies of the electronic state of active centers in elementoaluminosilicates (E-AS) show that Zn2+ and In3+ cations are associated with oxygen ions in zeolite channels with bonding energies inherent in their oxides. The high value of Zn 3d bonding energy explains the stability of zinc ions in the Zn-AS structure with no formation of clusters under heating the sample by an electron microscope beam. The isomorphic substitution of Al3+ ions in the zeolite crystal lattice by Zr4+ and In3+ ions, despite the relatively low Zr 3d and In 3d bonding energies, also results in the stability of Zr-AS and In-AS systems. It is found that the aggregation of Zr and In into oxide clusters is observed only under strong heating with the electron beam after the destruction of the zeolite channel structure.
AB - In-, Zr-, and Zn- containing elementoaluminosilicates of ZSM-5 zeolite structural type are synthesized by means of hydrothermal crystallization from alkaline alumina–silica gels. Based on the data of structural morphological studies on the samples, it is established that introducting metals into the zeolite structure leads to the formation of particles different in morphology and elemental composition. Studies of the electronic state of active centers in elementoaluminosilicates (E-AS) show that Zn2+ and In3+ cations are associated with oxygen ions in zeolite channels with bonding energies inherent in their oxides. The high value of Zn 3d bonding energy explains the stability of zinc ions in the Zn-AS structure with no formation of clusters under heating the sample by an electron microscope beam. The isomorphic substitution of Al3+ ions in the zeolite crystal lattice by Zr4+ and In3+ ions, despite the relatively low Zr 3d and In 3d bonding energies, also results in the stability of Zr-AS and In-AS systems. It is found that the aggregation of Zr and In into oxide clusters is observed only under strong heating with the electron beam after the destruction of the zeolite channel structure.
KW - active centers
KW - aggregates
KW - clusters
KW - crystals
KW - elementoaluminosilicate
KW - morphology
KW - zeolite
UR - http://www.scopus.com/inward/record.url?scp=85045074107&partnerID=8YFLogxK
U2 - 10.1134/S0036024418040349
DO - 10.1134/S0036024418040349
M3 - Article
AN - SCOPUS:85045074107
VL - 92
SP - 689
EP - 695
JO - Russian Journal of Physical Chemistry A
JF - Russian Journal of Physical Chemistry A
SN - 0036-0244
IS - 4
ER -
ID: 12417487