Effect of NH₃ Alkalization and MgO Promotion on the Performance of Ni/SBA-15 Catalyst in Combined Steam and Carbon Dioxide Reforming of Methane

Table 1

The structural properties of the catalysts.

Catalysts	^a (m^2/g)	^a (nm)	^a (cm^3/g)	^b (nm)	^c (°C)	^c (a.u.)	^d (a.u.)
Ni/SBA-15	232.6	6.08	0.29	18.35	369, 450, and 620	1	1
Ni/SBA-15-15NH3	—	—	—	—	340	1.8	1.2
Ni/SBA-15-20NH3	24.89	2.50	0.02	40.8	331	1.8	1
Ni/SBA-15-25NH3	27.42	2.54	0.02	30.0	330	1.9	1.2
Ni3Mg/SBA-15	—	—	—	—	392, 788	0.89	1
Ni6Mg/SBA-15	36.5	2.14	0.02	21.0	385, 760	0.73	2
Ni9Mg/SBA-15	27.5	1.64	0.01	18.5	360, 440, and 586	1.07	4

^aBET surface (), average pore diameter (), and total pore volume () were obtained from N₂ adsorption isotherm analysis. ^bNiO crystal size () was obtained from XRD patterns at . ^cThe maximal reduction temperature () and the number of reduced Ni^o, based on H₂ consumption, were obtained from H₂-TPR results. ^dThe desorbed CO₂ amount () was obtained from the results of CO₂-TPD results of activated samples.