Pressure effect, photoluminescence spectra

Fig. 55. Phololumiiiescence (a) and its excitation spectrum (b) of Cu(I)ZSM-5 aitalysl and the effect of CO addition on the photolumincscencc (1-4). Catalyst was prepared by evacuation of the original Cu(II)ZSM-5 sample (1.9 wt% as Cu metal) at 973 K. Addition of CO was carried out at 77 K. CO pressure (Pa) 1, 173 2, 306 3 and 3 (excitation spectrum of the photoluminescence spectrum 3), 372 4, 2660 [reproduced with permission from Yania-shita et al. (7iSd)].

Fig. 1. Effect of the addition of NO on the photoluminescence spectrum and the excitation spectrum of Mo-MCM-41 with loading amount of 1.0 Mo wt%. Pressure of added NO (A, a) 0 (b) 0.07 (C, c) 0.4 Torr (d) excess (e) degassed after (d).

Figure 18.14 The observed ordinary photoluminescence spectrum of (a—1) the / ZSM-5 catalyst and (b) its excitation spectrum and the effect of the addition of NO on the photoluminescence. The addition of NO was carried out at 298 K. NO pressure (in Torr) 1, 0.0 2, 0.2 3, 4.0 4, after the degassing of NO at 298 K. The excitation spectra were monitored at 340 nm.

---