The Synthesis Of SBA-15 Mesoporous Molecular Sieve And Study On Its Adsorption And Methane Storage Function

Because of having orderly hole compared with microporous molecular sieves, the inorganic mesoporous material can be the adsorption or catalytical reaction place of big molecule. Furthermore its potential usage in big molecule seperation and heavy oil catalys make mesoporous material becoming the hot spot of research. Using non-ionic surfactant,the Stucky of the California University synthesized a new kind of molecular sieves SBA-n. Because of its good structure function, excellent hydrothermal stability, steady framework structure, easily polished interior surface and certain wall thickness with easily blended element, SBA-15 is especially outstanding of SBA series. It has a bright future in various domains, such as chemical industry, environment energy, living creature technique, adsorption-separation, catalyst and light, electric, magnetism, etc. The major content of our experiment is about the influence of various synthesis factor to the physical properties of SBA-15 and develop its application in CH4,CO2,N2 adsorption and methane hydrate storage.Using the HCl density of 0.1 M, we can make the synthetic material with the tallest pore volume and biggest BET surface area. To regulate synthesis temperature, time and quantity of expander 1,3,5-3 methyl benzenes(TMB), we can acquire the pore size continuously adjustable between 5 and 20 nm and high BET surface area of 500 m2/g-900 m2/g. Through repeating the experiment under the same condition, we know the well reduplicate property of SBA-15.By measuring CH4, CO2 and N2 adsorption isotherms on three selected samples with different physical property at 275 K, we discover SBA-15 has different ability to adsorb these three kinds of gas. So it can be used as a candidate adsorbent of separating CH4, CO2 and N2.Through the measurement of CH4 adsorption isotherm on SBA-15 preadsorbed different amount of water at 275K, we find a sharp increase existed in all of these isotherms. Along with the increase of preadsorbed water amount, the highest methane adsorption quantity rise, in contrast the pressure of sharp increase lower gradually: when Rw is 2.92, the biggest methane adsorbed quantity is 3.75 times of dry sample's, meanwhile the sharp increase pressure is close to methane hydrate formation pressure in water. Then we measure methane formation isotherm at 275 K, 277 K, 279 K and 281 Kwith Rw =2.69 to anticipate the enthalpy, we further confirm that the hydrate forms at the sharp increase pressure.