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Application of D‐optimal experimental design in nano‐sized ZSM‐5 synthesis for obtaining higher crystallinity
Author(s) -
Soltanali Saeed,
Halladj Rouein,
Rashidi Alimorad,
Bazmi Mansour
Publication year - 2014
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201300434
Subject(s) - crystallinity , materials science , molar ratio , zeolite , analytical chemistry (journal) , nano , mineralogy , nuclear chemistry , chemistry , chromatography , composite material , catalysis , organic chemistry
D‐optimal experimental design with three levels of SiO 2 /Al 2 O 3 , template/SiO 2 , H 2 O/SiO 2 , SiO 2 /Na 2 O and TPABr/TPAOH ratio parameters was used to optimize the experimental parameters by the analysis of variance (ANOVA). The effects of above mentioned ratios in the initial synthetic mixture on the crystallinity of the ZSM‐5 zeolite were studied. The synthesized samples were characterized by XRD, FE‐SEM, and TEM analysis. Fischer test results showed that SiO 2 /Al 2 O 3 and H 2 O/SiO 2 molar ratios are the most and least effective parameters, respectively, in the range studied. The most important two‐way interaction variable was that of template/SiO 2 and Na 2 O/SiO 2 molar ratios. The optimum composition of the gel compound to achieve relative maximum crystallinity is SiO 2 /Al 2 O 3 = 99.96, template/SiO 2 = 0.16, H 2 O/SiO 2 = 34.68, Na 2 O/SiO 2 = 0.02 and TPABr/TPAOH = 1.44.