Would collisions cause debris to be ejected into a higher orbit? Although I guess as long as the debris does not pick up any significant speed boost, its orbit would be elliptical and would just collide with Earth (burn up on re-entry)?
e.g. https://ntrs.nasa.gov/api/citations/20100002023/downloads/20...
which has a chart of apogee/perigee of debris. There seem to be examples of debris with _perigee_ above the collision altitude but the vast majority stayed beyond.
There would be disentigration when satellite pieces rip through other satellites.
How many satellites carry compressed gas for orbit adjustments?
Maybe there is some compressed gas pushing against liquid fuel and oxidizers, but I don't think the fuel and oxidizers would explode. Shooting tanks of gasoline with regular bullets do not cause explosions like movies would have you believe. Well, maybe pure oxidizers might, would there be enough heat generated by the tank being punctured?