Synthesis of hierarchical nanoporous HY zeolites from activated kaolin, a central composite design optimization study
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Elservier
Abstract
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In this article, we investigated the optimum formulation towards synthesis of hierarchical nanoporous
HY zeolites from acid activate kaolin. A central composite design (CCD) helped to examine the influence
of aging (X1), crystallization (X2) and NaOH solution to kaolin ratio (X3) on crystallinity (C%), specific surface
area (SSA) and hierarchical factor (HF). From the analysis of variance (ANOVA), we deduced that all
the process variables show statistical significance towards obtaining high C% and SSA while only X3 is statistically
significant for optimal HF. The effectiveness of models was further evaluated using margin of
error and tolerance interval. The Optimum formulation for this hierarchical nanoporous HY zeolite was
43.60, 64.23 and 6.97 for X1, X2, and X3, respectively. The developed models show that X3 is the most statistically
significant variable because it has the highest coefficient and the lowest p-value in the entire
model. These results give instrumental insight into the synthesis of hierarchical nonporous HY zeolite
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TP Chemical technology