Table 2 NH3-TPD analysis of MgAl2O4 (MA), 15Co3O4/γ-Al2O3 (CA), 15Co3O4/MgO (CM), and Co3O4/MgAl2O4 (Co/MA) samples.

From: CO2 utilization as a soft oxidant for the synthesis of styrene from ethylbenzene over Co3O4 supported on magnesium aluminate spinel: role of spinel activation temperature

S. No.

Sample

Weak (100–200 °C)

Moderate (200–400 °C)

Strong (400–800 °C)

Total acidity (mmol. g−1)

1

800MA

0.032

0.158

0.352

0.510

2

CM

0.085

0.312

0.492

0.889

3

CA

0.021

0.106

1.026

1.153

4

15Co/700MA

–

0.159

0.472

0.631

5

10Co/800MA

–

0.185

0.491

0.676

6

15Co/800MA

–

0.257

0.655

0.912

7

20Co/800MA

–

0.126

1.194

1.320

8

15Co/900MA

–

0.139

0.381

0.520

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