Static and Ultrasonic‐assisted Aging Effects on the Synthesis of Analcime Zeolite

Abstract

The synthesis of zeolite ANA under static hydrothermal conditions was performed accompanied by an additional static and ultrasonic‐assisted aging of the reaction mixture prior to crystallization. The aging process was compared with stirring‐assisted aging, microwave‐assisted aging and syntheses without any aging. The influence of aging time on the crystallization time of zeolite ANA was investigated. The static and ultrasonic‐assisted aging can shorten the crystallization time of the ANA phase. Moreover, ultrasonic‐assisted aging leads to altered morphologies of the particles. The products were characterized by X‐ray diffraction (XRD) and scanning electron microscopy (SEM).

Effect of ultrasound energy on the zeolitization of chemical extracts from fused coal fly ash

“…The hot spots produced due to these cavitations can reach a temperature of 5000°C, the local pressure can go as high as 20 MPa with high cooling rates of 10 7°C /s these cavitations result in particle collisions at high velocities [4][5][6]. There have been many reported works where zeolites have been synthesized utilizing UTS energy [7][8][9][10][11][12][13][14].…”

“…However, the UTS impulses used in their experiments were 2 MHz so there was no energy input and thus no effect on the zeolitization was expected [17]. It is hypothesized that dissipation of UTS energy in the reaction mixture obtained from fused CFA extracts would shorten the reaction time as observed in experiments conducted using pure chemical precursors [7] chemical precursors [7][8][9]13,14] or CFA precursors [10,11]. The brief descriptions of the experimental procedures reported in literature are summarized in Table 1.…”

Effects of the different synthetic parameters on the crystallinity and crystal size of nanosized ZSM-5 zeolite

“…Different methods, such as the application of ultrasound or microwave treatment (Azizi and Yousefpour 2010, Razavian et al 2011, Askari and Halladj 2012 and the variation of different parameters, can lead to the formation of nanosized zeolites. Reducing the ZSM-5 zeolite particle size leads to a shorter diffusion path of molecules and a less mass transfer resistance (Nagamatsu et al 1992, Yamamura et al 1994, Tosheva and Valtchev 2005, Majano et al 2009).…”

Isomorphous Substitution of Iron and Nickel into Analcime Zeolite

“…[10][11][12][13][14] We recently reported the preparation of Al-rich analcime (ANA) with Si/Al ratios of 10-19. [15][16][17] This paper aims to study the structural consequences following the incorporation of Fe +3 and Ni +2 into ANA and attempts to experimentally increase its content to arrive at uniform Fe-Al ANA and Ni-Al ANA. We present evidences of the incorporation of iron and nickel into the framework (channel wall) of ANA by framework vibration Fourier transform infrared (FT-IR) spectroscopic method, powder X-ray diffraction (XRD), diffuse reflectance UV/Vis spectroscopy and nitrogen adsorption.…”