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Quantitative Determination of CeOH4++ Complexes in CeY Zeolites

In CeY zeolites hydroxyl groups may act as Bronsted-centres and play an important role in the catalytic properties of these adsorbents. Therefore it is of interest to determine the total number of OH groups and to get information about their bonding to the zeolite lattice. One of the possibilities to obtain the number of that sort of protons which are interacting with Ce + is to measure the frequency dependence of the second moment of proton magnetic resonance [1, 2]. For these measurements we used a NaY zeolite where 73% of Na ions were exchanged by Ce . The samples were heated to 300 or 400°C and then evaporated to 10~ Pa (DB treatment), or evaporated and heated to 300 or 400°C (SB treatment). The second moment of the protons was measured at frequencies of 21 and 62 MHz at room temperature. The results are given in Table 1. The total number of hydroxyl groups per cavity (1/8 of the unit cell) is 4.3, 3.2, and 1.1 for 73 NaCeY 300 DB, 73 NaCeY 400 DB, and 73 NaCeY 400 SB respectively [2]. The frequency dependence of M2 can be explained using the general formula [3]