Monolithic catalysts have been widely investigated for CO

2

methanation due to their fast mass and heat transfer rate

but the effect of the interaction between the catalyst layer and the monolithic support has been little studied. In this work

Ni/Al

2

O

3

/SiC monolithic catalysts

Ni/Al

2

O

3

powder catalysts and Ni/Al

2

O

3

/SiC-M catalysts were prepared to explore the effect of Si-Al interaction between the catalyst layer and SiC ceramic for CO

2

methanation performance. Ni/Al

2

O

3

/SiC exhibited a CO

2

conversion of 53% and a CH

4

specific reaction rate of 0.05 mmol·g

-1

·s

-1

under conditions of 0.1 MPa

400 °C

and a WHSV of 60000 ml·g

-1

·h

-1

. The CO

2

conversion raised by 0.15-fold and the CH

4

specific reaction rate raised by 0.25-fold compared to Ni/Al

2

O

3

with the same catalyst content. SEM

XRD

Raman

and other characterization results revealed that the formation of Si-Al interaction between the catalyst layer and SiC ceramic could weaken the interaction between Ni and Al

2

O

3

thereby improving the catalytic activity of Ni/Al

2

O

3

/SiC catalyst. However

the Si-Al interaction was further strengthened during the high-temperature reaction process

which significantly weakened the interaction between Ni and A

l

2

O

3

thereby leading to a decline in the catalytic performance of Ni/Al

2

O

3

/SiC catalyst during an 80-h stability test. This study provides valuable insights for future research and development of monolithic catalysts.