Application of D‐optimal experimental design in nano‐sized ZSM‐5 synthesis for obtaining higher crystallinity

Abstract

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.

Beneficial Use of Ultrasound in Rapid-Synthesis of SAPO34/ZSM-5 Nanocomposite and Its Catalytic Performances on MTO Reaction

“…The XRD pattern in Figure e reveals the formation of pure ZSM-5 crystal with tetragonal structure. The diffraction peaks that emerged at 2θ = 7.8, 8.8, 23.3, 23.4, and 24.1° are similar to those of ZSM-5 reported in the literature. , Based on Figure f, the U-SAPO-34 molecular sieve possesses characteristic peaks at 2θ = 9.6, 12.9, 20.8, and 31°. Compared to XRD patterns of U-SAPO-34 and ZSM-5, the composite and physical mixture samples show all characteristic XRD peaks of both phases.…”

Anti-cancer activity of hierarchical ZSM-5 zeolites synthesized from rice-based waste materials

“…[6][7][8] In general, for the synthesis of high-silica zeolites, large quantities of organic ammonium cations were used such as tetraalkylammonium ions and diamine, and they were introduced into the aluminosilicate gels for the formation of the zeolitic framework in which they served as a structure-directing agent or as a space-lling agent. 9,10 However, the organic templates needed for the synthesis are toxic and highly expensive as well as these organic species enclosed within zeolitic structures can be removed by calcination at high temperatures; this inevitably leads to both energy consumption and environmental pollution. 11,12 Therefore, organic template-free synthesis of zeolites is strongly desirable since it is more ideal, cheaper, and less toxic.…”

Effect of copper on textural and acidic properties of hierarchical nanocrystalline ZSM‐5

“…Both nano‐ZSM‐5 and ion‐exchanged samples show the same crystalline features. The characteristic diffraction peaks at 2θ, which include 7.79°, 8.69°, 23.08°, 23.48°, 23.78°, and 24.28°, are completely indexed to the ZSM‐5 structure of MFI topology, and they match with the JCPDS as given in Figure 1 8,19–27 …”