ZEOLITE-RHO LOADED WITH METHYLAMINES .2. DIMETHYLAMINE LOADINGS

Samples of two differently prepared zeolite rho loaded with different amounts of dimethylamine (DMA) were studied in their hydrated forms by X-ray diffraction. Both zeolites are partially dealuminated, as indic ated by nonframework Al which is assumed to be Al2O3 or AlOOH. Series I was prepared from dry-calcined NH4-rho at 873 K, series II from stea m-calcined NH4-rho at 773 K. The samples were loaded with different am ounts of DMA. Rietveld refinements yielded the following results for s eries I: (1) H-3.8(H-DMA)(5)Cs0.2Al9Si39O96.Al2O3.21H(2)O, X-ray data collection at room temperature, <Im(3)over bar m>, a = 15.0590 (2) Ang strom, R-wp = 0.089; (2) (H-DMA)(8.8)-Cs0.2Al9Si39O96.Al2O3.18H(2)O, X -ray data collection at room temperture, <Im(3)over bar m>, a = 15.068 0 (2) Angstrom, R-wp = 0.091. Series II: (3) 0.3(H-DMA)(5)Cs0.7Al6Si42 O96.2.5Al(2)O(3).24H(2)O, X-ray data collection at room temperature, < Im(3)over bar m>, a = 15.096 (2) Angstrom, R-wp = 0.120. DMA resides o n the center axis through the alpha-cage with the N atoms pointing to the single eight-ring and the two methyl groups oriented towards the c enter of the alpha-cage.