Ni_xMg_6-x

Al_1.8La_0.2

Co-precipitation and calcined under an airflow at 800˚C

600˚C - 800˚C

Catalyst exhibited increased CH₄ and CO₂ conversion thenLa free catalyst

carbon deposition on the catalyst surface was Significant

75 - 80

[102]

La promoted

Ni-Mg-Al

Co-precipitation followed by calcination at 600˚C for 6 hours in flowing air

600˚C & 750˚C

La-promotion enhanced the reducibility of NiO and was beneficial for preparing hydrotalcite based Ni catalysts for DRM

deactivation of the catalyst is severe at low temperatures

82

[103]

Ce promotion Ni/Al and Ni/Mg/Al

Co-precipitation, calcination in the stream of air for 4 h at 550˚C and then adsorption of Ce

550˚C, 650˚C & 750˚C

Ce-promotion in Ni/Mg/Al and Ni/Al increased CH₄ concentrations and affected both activity, selectivity and stability of the developed catalyst

Excess presence of CH₄ and CO₂in the feed decreases both CH₄ and CO₂ conversions

87

[104]

Zr promoted Mg(Ni, Al)O

Co-precipitation followed by calcination at 550˚C for 4 h

550˚C, 650˚C & 750˚C

The amount of incorporated Zr and its placement in the catalyst system affected activity, basicity, and textural properties of the catalyst

Zr introduction to the catalyst system decreased activity.

83

[105]

Ni containing

Mg-Al

Co-precipitation and then calcination for 5 h at 500˚C

300˚C

Higher Ni incorporation affected both the CO₂ adsorption capacity andthe reducibility of the catalysts

CH₄ selectivity of the catalyst decreases at higher temperatures (400˚C - 450˚C)

98.3

[106]

NiMgAl

Co-precipitation followed by calcination in the static air at 500˚Cfor 10 h

800˚C

Catalysts with a higher Mg/Al ratio exhibited better resistance to coke formation and catalytic activity. Ni-Mg-Al catalyst with Mg/Al ratio of 1 exhibited the best catalytic performance and stability

Low activity and stability was reported for Al-rich catalysts

83

[107]

Ni-Mg-Al

Co-precipitation followed by calcination for 6hrs at different temperatures of 300˚C, 400˚C, 500˚C, 600˚C, 700˚C, and 800˚C

Temperatures between

400˚C and 700˚C & atmospheric pressure

High catalytic performance due to the lower size of nickel and better stability of the Htlc (NiAl₂O₄) support

Reduction temperature increases with increasing calcination temperatures

90

[108]

CeZr, Zr, and Ce promoted

Ni-Mg-Al

Co-precipitation and then calcination for 4 h at

550˚C

550˚C

Zr affected both the selectivity and catalytic activity of the catalyst

Conversion of both CO₂ and CH₄ was comparatively low

40

[78]

CeO₂-modified

Ni-Mg-Al

Co-precipitation and then calcination for 4 h at

650˚C

0.1 MPa & 750˚C

CeO₂-modified catalysts presented high activity during pressurized DRM

CeO₂ addition by both co-precipitation and impregnation method led to a decrease in the pore diameter, total pore volume, and surface area.

58

[109]

Ni-Mg-Al

Co-precipitation followed by calcination at 800˚
C for 5 h.

400˚C to 800˚
C

Catalysts exhibited increased activity for both the CH₄ and CO₂ reforming. Moreover, increasing Ni loadings promoted activity

At low temperature (600˚C) catalytic stability decreased with higher Ni loadings

86

[110]