Synthesis of ZSM-5 zeolites using hexamethylene imine as a template: Effect of microwave aging

Sinter-resistant gold nanoparticles encapsulated by zeolite nanoshell for oxidation of cyclohexane

“…The X-ray diffraction (XRD) data (Fig. 2) of Au@ZSM-5 and Au@MCM-22 possess diffraction peaks 32,33 of corresponding zeolites matching with previous reports and also with the JCPDS data (JCPDS les 42-0023 and 47-0242). To check the effect of heat treatment on crystallinity of ZSM-5, XRD analysis was also carried out for ZSM-5 dried at 200 C (Fig.…”

“…In another beaker 0.053 g of sodium hydroxide was mixed together with 1.7 ml HMI and 0.15 g of sodium aluminate in 15 ml H 2 O. [33][34][35] The mixture thus obtained was added in silica coated gold nanoparticles. The nal mixture was transferred to autoclave and the reaction was carried out at 158 C for 3 days.…”

MCM-22, MCM-36, and ITQ-2 Zeolites with Different Si/Al Molar Ratios as Effective Catalysts of Methanol and Ethanol Dehydration

“…The third strongest diffraction peak of ZSM-5 should be at about 23 • and therefore may be overlapped by (1 0 6) reflection of MCM-22. Secondly, the synthesis of ZSM-5 with using hexamethylene imine, used also in the synthesis of MCM-22(P), was reported in scientific literature [25]. However, as it was already mentioned, this hypothesis is very speculative and additional studies should be done to explain this scientific problem.…”

Application of Unconventional External-Field Treatments in Air Pollutants Removal over Zeolite-Based Adsorbents/Catalysts

“…have been successfully synthesized by the microwave-assisted method [110]. At present, the ZSM-5, SAPO-34, and SSZ-13 zeolites loaded with Cu have been used in ammonia selective catalytic reduction of NO x [111]. There are also several zeolites synthesized by microwave methods for the adsorption or catalytic purification of VOCs [112], such as MCM-41, MCM-22, NaX, and NaY [113].…”

“…Therefore, these activated water molecules with high activation energy can lead to rapid gel dissolution [95]. Jun et al [111] found that microwaves could promote the formation of crystal nuclei during the aging process of ZSM-5. The SAPO-34 with different morphologies was synthesized by Lin et al [105] after rapid crystallization at 180 • C for 1 h in a microwave radiation device, which greatly shortened the crystallization time from 2.5 h. Shalmani et al [110] synthesized the SAPO-34 by combining the microwave with a traditional hydrothermal method and concluded that the microwave played a main role in promoting nucleation and shortening crystallization time from 24 to 3 h. The microwave heating radiation was also applied by Yu et al [92] to the synthesis of SSZ-13, and the crystallization time was greatly shortened from 72 h under traditional hydrothermal crystallization to 9 h. The main reason was that microwaves could promote the rapid dissolution of the gel mother liquor, activate the water molecules, and improve the reaction rate, thus shortening the induction period and nucleation period during the process of crystallization.…”