Concentrations of base and acid site according to CO₂-TPD and NH₃-TPD profiles.

Sample	Base sites (mmol g−1)				Acid sites (mmol g−1)
	B TOTAL a	B W b	B M b	B S b	A TOTAL c	A W d	A M d	A S d
Mg2Zr0.22Al0.78–MMO	0.311	0.045	0.151	0.115	0.277	0.074	0.143	0.060
Mg2Zr0.33Al0.67–MMO	0.367	0.060	0.209	0.098	0.299	0.115	0.132	0.052
Mg2Zr0.53Al0.47–MMO	0.543	0.103	0.315	0.125	0.436	0.160	0.224	0.052
Mg2Zr0.67Al0.33–MMO	0.411	0.076	0.254	0.081	0.306	0.143	0.107	0.056

^a B _TOTAL is the total concentration of base sites calculated based on CO₂-TPD.

^b B _W, B_M, and B_S represent the concentration of weak, medium, and strong base site, respectively, which are calculated according to CO₂-TPD and the deconvoluted TPD profiles in the temperature range 50–550 °C.

^c A _TOTAL is the total concentration of acid sites calculated based on NH₃-TPD.

^d A _W, A_M, and A_S denote the concentration of weak, medium, and strong acid site, respectively, which are calculated according to NH₃-TPD and the deconvoluted TPD profiles in the temperature range 50–550 °C.