Crystallization of magnesium-containing aluminophosphate (MgAPO-11) by dry-gel conversion method

PETR 12

Shyamal Kumar Saha, sks23@psu.edu, Clean Fuels and Catalysis Program, The Energy Institute and Department of Energy and Mineral Engineering, The Pennsylvania State University, 209 Academic Projects Building, University Park, State College, PA 16802 and Chunshan Song, csong@psu.edu, Clean Fuels and Catalysis Program, The EMS Energy Institute and Department of Energy and Mineral Engineering, The Pennsylvania State University, 209 Academic Projects Building, University Park, State College, PA 16802.
Medium pore molecular sieve MgAPO-11 was synthesized by dry-gel conversion (DGC) method, using n-dipropyl amine as a structure-directing agent (SDA). The highly crystalline MgAPO-11can be obtained by steam-assisted conversion (SAC) method at MgO/Al2O3=(0.025-0.10). Small amount of Mg may have accelerated the crystallization of AlPO4-11 phase. Pure MgAPO-11 can be synthesized within 12 h at 175oC by steam-assisted conversion method. However, vapor-phase transport (VPT) was not good for synthesis of pure MgAPO-11 at lower MgO/Al2O3=(0-0.05) even synthesis was done by identical condition. The physico-chemical properties of synthesized materials were characterized by XRD, SEM, BET and NH3-TPD. The isomorphous substitution of magnesium into the neutral framework of AlPO4-11 was also evaluated by NH3-TPD analysis. SAC is an effective method for the synthesis of highly crystalline MgAPO-11.
 

Zeolite Catalysis for Green Chemistry in Synthesis of Chemicals and Fuels
8:20 AM-12:00 PM, Sunday, April 6, 2008 Morial Convention Center -- Rm. 209, Oral

Division of Petroleum Chemistry

The 235th ACS National Meeting, New Orleans, LA, April 6-10, 2008