Figure 2

XRD patterns of these samples. (a) Spent FCC catalyst, (b) Ti/FCC, (c) V-Ti-2/FCC, (d) V-Ti/FCC and (e) V/FCC. The peaks generated by zeolite Y are marked with hexagram (JPDS card No. 77–1551); the peaks generated by TiO₂ are marked with rhombus (JPDS card No. 73–1764); the peaks generated by V₂O₅ are marked with dot (JPDS card No. 45–0429).