Difference between the methods for methanol reforming

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This is a catalytic bed section for methanol reforming, and I used two methods to simulate it.

The one side is a porous catalyst, and the other side is a porous medium.

The difference between the two is: for the former, I filled the parameter Scat into the porous catalyst, while for the latter, I directly filled it into the forward reaction frequency factor in the chemical reaction.

It feels like the product is the same for both, so why are the simulation results so different?



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