“…K E Y W O R D S CO oxidation, Co-Al oxide, mesoporous nanosheet, stable catalyst 1 | INTRODUCTIONThe oxidation of carbon monoxide (CO) over heterogeneous catalysts is of great importance due not only to the practical applications in automotive gas treatment, indoor air cleaning, and CO removal from H 2 feed gas for fuel cells, but also to its use as a model reaction in laboratory research. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] Up to now, many highly efficient catalysts for CO oxidation, mainly including supported noble metals (such as Au and Pt) 8,9,11,12,[19][20][21][22][23][24][25] and metal-oxides (such as Co 3 O 4 and MnO 2 ) have been successfully developed. 7,[13][14][15][16][17][18][26][27][28][29][30][31][32][33] For example, TiO 2 -supported Au catalyst is very active for CO oxidation at the temperature of −70 C. 1...…”