“…Moreover, some binary oxides, e.g., TiO 2 -SnO 2 [25], Sb 2 O 5 -SnO 2 [26] and In 2 O 3 -SnO 2 [27], have also been investigated as potential supports for Pd catalysts. In particular, Wang et al reported that a small amount of Ta cations can be doped into the lattice of tetragonal rutile SnO 2 to form solid solution structure.…”