  The fabrication of synthetic self-propelled particles and the experimental
investigations of their dynamics have stimulated interest in self-generated
phoretic effects that propel nano- and micron-scale objects. Theoretical
modeling of these phenomena is often based on a continuum description of the
solvent for different phoretic propulsion mechanisms, including,
self-electrophoresis, self-diffusiophoresis and self-thermophoresis. The work
in this paper considers various types of catalytic chemical reaction at the
motor surface and in the bulk fluid that come into play in mesoscopic
descriptions of the dynamics. The formulation is illustrated by developing the
mesoscopic reaction dynamics for exothermic and dissociation reactions that are
used to power motor motion. The results of simulations of the self-propelled
dynamics of composite Janus particles by these mechanisms are presented.
