Synthesis And Application Of Nanoscale NaY Molecular Sieve From Attapulgite

With the rapid development of the world, the global gasoline and diesel fuel demand is increasing and the catalyst activity, stability requirements continue to increase, because of their large surface area, good thermal stability, catalytic activity the huge number of multi-center, high intragranular diffusion rate and other characteristics, and lower secondary cracking catalyst coking ability to improve the conversion of macromolecules and other aspects of the product, the nanoscale NaY moleular sieve catalysts showed a reduction of more superior than the conventional NaY moleular sieve crystal size performance. Currently, the NaY moleular sieve has been widely used in catalytic cracking, hydrocracking and isomerization cracking and other refining processes. Therefore, research of low cost, green and environmental friendly, superior performance nanoscale Y zeolite NaY moleular sieve has important practical significance and industrial value.The attapulgite from xuyi was treated with calcined at temperature of950℃. the nanoscale NaY moleular sieve has been hydro thermal synthesized. Study focused on influence of different crystallization temperature, crystallization time, directing agents aging time, material ratio of n(SiO2)/n(Al2O3), n(Na2O)/n(SiO2) and an additional amount of water on relative crystallinity of NaY molecular seives, The sample was characterized by XRD, SEM, N2adsorption-desorption. The results show that the n(Si02)/n(Al203)=4.7, n(H20)/n(Na2O)=55:1, n(Na2O)/n(Al2O3)=0.7, crystallization temperature99℃, the crystal of time24h, directing agents aging temperature30℃, aging time24h, extra water less than10ml, the49%relative crystallinity nanoscale attapulgite NaY molecular seives was synthesized, the average particle size less than100nm, the porous carbon materials specific surface area and pore volume reach up to487m2/g,0.33cm3/g.Then, the porous carbon materials were synthesized by using NaY as hard template and maltose as carbon precursor, to obtain a kind of microporous carbon material. The XRD, N2adsorption-desorption were conducted to investigate the physical properties of NaY molecular sieves and porous carbon materials. Test results show that the BET surface area of carbon materials template789.2m2/g, a total pore volume of0.616cm3/g, micropore volume rate of85.6%. Respectively, The constant current charge/discharge tests, AC impedance tests and cyclic voltammetry tests were employed to investigate the electrochemical performance of the as-prepared porous carbon. When the current density is600mA/g, the maximum specific capacitance of the material is163.3F/g. The AC impedance tests shows that showed that the microporous carbon material having a outstanding double-layer properties, most capacitance in capacitance of supercapacitors can be used. The cyclic voltammetry curves maintain a typical quasi-rectangular feature when the scan rate increased from5mV/s to100mV/s. It is illustrate that the material exhibits a well rate performance.