You can use ANSYS Fluent/ CFX if you have their license. In case of opensource code, you can try OpenFOAM.
If you need only pressure profile in a simple geometry like 1D tube, you can choose even simpler solution via MATLAB 1D model.
The above CFD tools can give us information about: Pressure, temperature, concentration, velocity, reaction rate, phases volume fractions etc. with respect to your device geometry.
Yes, of course.
You need to employ mass, energy and momentum equations in a pseudo-homogeneous 1D model.
In the mass equation, you can insert the reaction rate.
in the momentum equation, you can measure the pressure drop along the reactor height.
The concept of 1D model can be found in this book:
https://www.wiley.com/en-us/Chemical+Reactor+Analysis+and+Design%2C+3rd+Edition-p-9780470565414
Commercial software such as Fluent/CFX or Comsol are easier for the users than OpenFOAM.
If you do not have much experiences on using such software, I think that Fluent is the best choice. Since it is updated frequently for algorithm improvement.
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