Facile synthesis of nano-sized NH4-ZSM-5 zeolites

Effect of precursor acidity on zeolite supported Pd catalyst properties and hydrodeoxygenation activity for the production of biofuel

“…This observation is typical of solids having considerable degree ofmesopores [19].Theincrease in the amount of N 2 adsorbed in the Pd/Zand FPd/Zcompared to ZLTalso supports the data in Table 2 which is in accordance with previous reports that loss of crystallinity usually leads to increase in the pore volume and specific surface area [19][20][21][22][23].…”

“…The loss of crystallinity in both catalystscan be seen to have considerably reduced their particles sizes with attendant increase in surface area compared to the ZLT supportas shown in Table 2 (BET analysis). As earlier mentioned, aluminosilicatesusually experience loss of crystallinity under acid influence and thermal treatment which is usually accompanied by increase in the specific surface area, and such lossof crystallinity is a function of the acid type and concentration as well as the degree of thermal treatment [22].The considerable loss of crystallinity in Pd/Z can be ascribed to the combined effect of OxA functionalization and proper calcination at the Pd/Z synthesis stage resulting in dealumination from the lattice structure, while the apparent amorphous observed in FPd/Z can be ascribed to the additionalcrystallinity loss due to intense dealuminationeffect from fluoride ion. This result further corroborates earlier observation in Table 1.…”

HZSM-5/MCM-41 composite molecular sieves for the catalytic cracking of endothermic hydrocarbon fuels: nano-ZSM-5 zeolites as the source

“…However, at 0.45 \ p/ p 0 \ 0.95, there was a jump in the adsorbed amount appeared due to N 2 filling the mesopores in HZM. Isotherms with steep uptake at higher p/p 0 were obtained for HZM-Ns and HZSM-5-N (50), which may be ascribed to the interparticle voids formed by agglomeration of the nano-sized primary particles (Xue et al 2012). In addition, as shown in Fig.…”

Seed-assisted OSDA-free synthesis of ZSM-5 zeolite and its application in dehydrogenation of propane

“…Ren et al [14] proposed a method based on seed surface crystallization method for the rapid and controllable synthesis of ZSM-5 zeolite with core-shell structure. Xue et al reported the successful synthesis of NH 4 -ZSM-5 zeolites with different Si/Al ratio and size by simply adjusting the amount of seeding suspension [15]. Addition of an organic additive and colloidal silicalite-1 seeds to the initial synthesis mixture for the fabrication of ZSM-5 were compared by Xu et al [16].…”