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An Unusual Pathway of Crystallization of Zeolite ZSM-5 in Heterogeneous System: Phenomenology and starting considerations


Ren, Nan; Subotić, Boris; Bronić, Josip; Tang, Yi; Dutour Sikirić, Maja; Mišić Radić, Tea; Svetličić, Vesna; Bosnar, Sanja; Antonić Jelić, Tatjana
An Unusual Pathway of Crystallization of Zeolite ZSM-5 in Heterogeneous System: Phenomenology and starting considerations // Chemistry of materials, 24 (2012), 10; 1726-1737 doi:10.1021/cm203194v (međunarodna recenzija, članak, znanstveni)


Naslov
An Unusual Pathway of Crystallization of Zeolite ZSM-5 in Heterogeneous System: Phenomenology and starting considerations

Autori
Ren, Nan ; Subotić, Boris ; Bronić, Josip ; Tang, Yi ; Dutour Sikirić, Maja ; Mišić Radić, Tea ; Svetličić, Vesna ; Bosnar, Sanja ; Antonić Jelić, Tatjana

Izvornik
Chemistry of materials (0897-4756) 24 (2012), 10; 1726-1737

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Zeolte ZSM-5; Unusual crystallization pathway; “Worm-like” particles; Condensed aggregates; Polycrystalline aggregates; Heterogeneous system

Sažetak
Crystallization of zeolite ZSM-5 from a diluted heterogeneous system (12.5Na2O-Al2O3-8TPABr-60SiO2-4000H2O) was investigated by various experimental methods such as, X-ray diffraction (XRD), electron diffraction (ED), infrared spectroscopy (FTIR), X-ray fluorescence (XRF), scanning-electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), thermo-gravimetric analysis (TG-DTG), particle size analysis (PSA) and Inductive Coupling Plasma (ICP) Emission Spectrometry. The crystallization process is characterized by a very long “induction period” (95 % of the entire reaction time) and very fast transformation (5 % of the entire reaction time) of amorphous to crystalline phase (zeolite ZSM-5) at the end of crystallization process. Analysis of the obtained results have shown that the crystallization process takes place by a chain of processes: (i) formation of “primary” amorphous aluminosilicate precursor (gel) at room temperature, (ii) formation of “secondary” amorphous aluminosilicate precursor (“worm-like” particles – WLPs), (iii) formation of “tertiary” amorphous aluminosilicate precursor (condensed aggregates – CAs) by aggregation of the WLPs and densification (condensation) of aggregates and (iv) formation of nuclei and their growth in the matrixes of CAs ; these processes result in the formation of fully crystalline zeolite ZSM-5 in the form of polycrystalline aggregates.

Izvorni jezik
Engleski

Znanstvena područja
Kemija



POVEZANOST RADA


Projekt / tema
098-0982904-2953 - Studij utjecaja svojstava alumosilikatnih prekursora na njihove transformacije (Josip Bronić, )
098-0982934-2744 - Površinske sile na atomskoj skali u istraživanju mora i nanotehnologiji (Vesna Svetličić, )

Ustanove
Institut "Ruđer Bošković", Zagreb

Časopis indeksira:


  • Current Contents Connect (CCC)
  • Web of Science Core Collection (WoSCC)
    • Science Citation Index Expanded (SCI-EXP)
    • SCI-EXP, SSCI i/ili A&HCI
  • Scopus


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