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That post suggests that setting the -m32 compile and link flags will compile your node as a 32-bit executable.

Since catkin is pure cmake, you should be able to use set_target_properties to add -m32 to the LINK_FLAGS and COMPILE_FLAGS properties on the node in question.

That said, this may not work very well if the ROS libraries that you're trying to link with are 64-bit. You may have to set up a separate workspace and build your node and all of its dependencies in 32-bit mode. In this case, you'll probably just want to set the CMAKE_CXX_FLAGS globally when you call catkin_make.