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Synthesis and Application of ReY Molecular Sieve with Good Performances and Low Sodium Content

Author: WangSuLi
Tutor: LiHuiPing
School: Zhengzhou University
Course: Chemical processes
Keywords: NaY zeolite Ion exchange Rare earth chloride Ammonium chloride Rey -type zeolite
CLC: O643.36
Type: Master's thesis
Year: 2009
Downloads: 35
Quote: 1
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Abstract


Y-type zeolite silica-alumina ratio, having a uniform and regular pore structure of molecular size and large surface area, which has a a unique adsorptive catalytic properties and good thermal stability. ReY type zeolite is a rare earth element load NaY Zeolite, reducing the sodium content having higher activity, can be used as an efficient adsorbent or catalyst. Industrial use of high-grade oil, such as anti-fuel, aviation speed oil because of the oil itself and working conditions and the environment, the use of prone to deterioration of the oil caused by the oil deeper color, acid value increased with increasing water content , decrease of resistivity and so on. Deterioration of the oil not only reduces the life of the anti-fuel, resulting in the failure of the system and its components, serious will also endanger the safe operation of the system, and the replacement of oil in the system will also greatly increase the cost. The task of the subject from the Aluminum Corporation of China Science and Technology Development Fund \for degradation-resistant oil purification regeneration, reduce production costs, improve the reliability of operation of the anti-fuel system will have a significant economic and social benefits. Load of rare earth elements Y zeolites and zeolite in the sodium content is reduced to less than 0.2% has not been reported. First of different composition, different aging time directing agent Hydrothermal Synthesis of NaY zeolite, BET and XRD analysis to characterize the degree of surface area and crystalline. The results show that the composition of the directing agent and aging time on the synthesis of NaY zeolite crystallization and performance have a greater impact. Using single-factor design NaY zeolite synthesis conditions: directing agent composed of 16Na 2 O: the 1Al 2 the O 3 : 15SiO 2 : 300H 2 O, Chen Hua 48h, sol aging at 50 ℃ for 2 h, 105 ° C under crystallization 48h, synthesis under this condition sodium type zeolite surface area of ??712 m 2 · g -1 , the degree of crystallinity of 92%, 13.8% of the sodium content. Secondly, the rare earth salts and ammonium salts of two-stage ion exchange process to modify the synthesis of NaY. Investigated by single factor method the first phase of rare earth chloride, switching time, switching temperature, the amount of wash water and baking ion exchange, for better exchange. Under the optimized conditions followed by exchange of the sodium content was reduced from 13.8% to 1.08%; investigated by orthogonal design factors of the second stage, the sodium content of 1.08% ReY zeolite with ammonium chloride, fluorosilicone ammonium two exchange agent to the depth of the ion-exchanged, the final sodium content down to 0.2% or less. Finally, ReY zeolite synthesized sodium content of 0.18% by measuring the conductivity and an acid value of the anti-fuel research and evaluation of the adsorption properties. The results show that when the adsorbent amount of 10% of the anti-fuel, from China Great Wall Aluminum Company deterioration resistant oil resistance rate of 2.6 × 10 9 Ω · cm to rise to 1.2 × 10 < sup> 12 Ω · cm, acid value reduced by 0.40mg (KOH) · g -1 to 0.04mg (KOH) · the g -1 , color from deep red to pale yellow, with the new anti-fuel close to the adsorption effect is better than other anti-fuel adsorbent. Low sodium prepared ReY zeolite with high adsorption performance, provide technical support and theoretical basis for research on low-sodium ReY sieve industrial production and application.

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalyst
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