Synthesis and Properties of the MFI Zincosilicalite

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Title:Synthesis and Properties of the MFI Zincosilicalite
Creators:
Giordano, Girolamo
Katovič, Andrea
Szymkowiak-Janiszewska, Ewa
Kowalak, Stanisław
Journal or Publication Title:
Collection of Czechoslovak Chemical Communications, 68, 6, pp. 1149-1162
Uncontrolled Keywords:MFI, Catalytic properties, Molecular sieves, Thermal analysis, Heterogeneous catalysis, Cracking, Hydrothermal crystallization, Zincosilicates, Zeolites

Abstract

Zincosilicalite MFI with various zinc contents (up to Zn/Si = 0.07) has been synthesized by hydrothermal crystallization. The samples with the Zn/Si ratio in the range 0.03-0.07 still show the crystalline structure of MFI, but they are less ordered and differ in properties from those with lower Zn contents. The mixtures with the Zn/Si ratios higher than 0.07 resulted in amorphous products or condensed crystalline phases (quartz). The introduction of Zn affected both the crystallization time and properties of the resulting products. Usually the higher Zn/Si ratio of the gel required a longer crystallization time. The zinc introduced affected the thermal template removal making it more difficult than for the zinc-free silicalite. The obtained zincosilicates were modified by ion-exchange with various cations. Contrary to zinc-free silicalite-1, they showed considerable catalytic activity in propan-2-ol decomposition and in cumene cracking. The activity usually increased with the Zn content up to the ratio Zn/Si = 0.03 and then decreased with rising Zn loading. It also depended on the cation introduced. The Cu-modifications resulted in dehydrogenation of propan-2-ol. <p>

Title:Synthesis and Properties of the MFI Zincosilicalite
Creators:
Giordano, Girolamo
Katovič, Andrea
Szymkowiak-Janiszewska, Ewa
Kowalak, Stanisław
Uncontrolled Keywords:MFI, Catalytic properties, Molecular sieves, Thermal analysis, Heterogeneous catalysis, Cracking, Hydrothermal crystallization, Zincosilicates, Zeolites
Divisions:Life and Chemical Sciences > Institute of Organic Chemistry and Biochemistry > Collection of Czechoslovak Chemical Communications
Journal or Publication Title:Collection of Czechoslovak Chemical Communications
Volume:68
Number:6
Page Range:pp. 1149-1162
ISSN:0010-0765
E-ISSN:1212-6950
Publisher:Institute of Organic Chemistry and Biochemistry
Related URLs:
URLURL Type
http://dx.doi.org/10.1135/cccc20031149UNSPECIFIED
ID Code:2111
Item Type:Article
Deposited On:06 Feb 2009 17:15
Last Modified:06 Feb 2009 16:15

Citation

Giordano, Girolamo; Katovič, Andrea; Szymkowiak-Janiszewska, Ewa; Kowalak, Stanisław (2003) Synthesis and Properties of the MFI Zincosilicalite. Collection of Czechoslovak Chemical Communications, 68 (6). pp. 1149-1162. ISSN 0010-0765

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