Patent ID: 7029642

Claim:
A crystalline solid UVL-1 having an X ray diffraction diagram including at least the peaks described in the table below: d hkl (A) 2theta (°) I/I 0 11.69 7.55 mw to vs 7.50 11.79 vw to w 5.76 15.36 w to mw 3.70 24.00 m to s 3.57 24.91 s 3.36 26.49 vs 3.14 28.48 w to mw 2.50 35.88 vw 2.41 37.30 vw in which vs = very strong; m = medium; w = weak; s = strong; mw = medium weak; vw = very weak. and with the following chemical composition, expressed as the anhydrous compound in terms of moles of oxide: (XO 2 ):(Y 2 O 3 ) m :(Z 2/n O) p in which: X represents at least one tetravalent element selected from the group formed by Si, Ge; Y represents at least one trivalent element selected from Al, B, Cr, Ga; Z represents at least one cation with valency n; and in which: n is in the range 2 to 4; m is in the range 0 to 0.2; and p is in the range 0 to 0.2.