Herein for the first time, a Schiff base alumoxane-supported palladium (SBA-PdA degrees) were successfully synthesized and reported as a new mesoporous nanocatalyst for C-C cross coupling reactions. The SBA-PdA degrees nanocatalyst could be dispersed in poly(ethylene glycol) and showed excellent catalytic activity for Suzuki-Miyaura, Stille and Heck coupling reactions. In addition, the nanocatalyst could be recovered and reused several times without significant loss of its catalytic activity. Pd leaching from SBA-PdA degrees is very negligible for this coupling reaction. [GRAPHICS]