Shanghai there are new molecular sieve, Ltd. - sieve and then at a temperature of 950-1200 ℃ calcined zeolite is obtained α-alumina powder, the mother liquor can be recycled. This method was invented by Austrian scientist Bayer (K.J.Bayer) in 1888, today is still the main method of industrial production of alumina, called "Bayer." In the crystal lattice of α-alumina molecular sieve Dexing, hexagonal close-packed oxygen ions, Al3 + symmetrically surrounded by oxygen ions in octahedral coordination center Jiaozhou zeolite lattice energy is large, so the melting point, high boiling point . α-alumina is not soluble in water and acid, Shanghai Limited --4A new zeolite molecular sieve proportion Bronst acid Lewis acid is higher than the pure phase molecular sieve. Used to catalyze the carbonylation of dimethyl ether, methyl acetate reaction system, BEA / MOR samples were significantly higher than BEA pure active phase, MOR pure phase and mechanical mixing BEA / MOR phase. 60 h of reaction MOR pure phase and BEA / MOR catalyst cocrystal heat loss show, BEA / MOR co-crystallized carbon molecular sieve is far below the MOR pure phase molecular sieve, therefore have a stronger reaction stability. Dexing sieve | new molecular sieves (certified) | new zeolite molecular sieves by the Shanghai Limited. Shanghai new molecular sieve Limited (www.molsionms.com) is Shanghai's Songjiang District, elemental leaders, over the years, the company implement the scientific management, innovation and development, the principle of honesty and trustworthiness, and satisfy customer needs. There are new leaders in the molecular sieve with the staff warmly welcome all inquiries negotiations to create new molecular sieves better future.