Possible To Put an Epoxy Coating on Particle Board?
Possible, yes. Recommended - probably not. What purpose to you intend it to serve? Why do you think epoxy coating (intended for application to concrete) makes it better for the purpose? With or without coatings, is particle board even remotely suitable for the purpose?

Responding to comment: Marine plywood would have been a much better choice of material - if the business lasts long enough for you to discover why that's the case, remember that when you have to replace the particleboard. Particleboard falls apart when it gets wet, and it will, no matter what you cover it with. Given that it's a food truck your choice of flooring will have to pass the health department inspection applicable to to the locale where it operates, and they may well have a preference, or even a list of approved materials; check with them before proceeding. Properly applied vinyl tile flooring is very likely more durable than epoxy - epoxy can be chipped. The solid vinyl tiles common in commercial kitchens take a lot of abuse, and if they are too badly damaged, can be replaced individually.