Chap10Lecture6N - 10.7 Catalyst Deactivation Topics: Types...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon
Topics: Types of Catalyst Deactivation Temperature-Time Trajectories Moving Bed Reactors· Straight Through Transport Reactors 10.7 Catalyst Deactivation C t changes.The catalyst activity is not constant in time. Determination of reaction rate law parameters Adjustment needed to account for catalyst activity, a(t), decay.
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
-r A (t) = a (t) x [-r A (fresh catalyst)] Nonseparable kinetics Separable Kinetics -r A  = -r A (past history, fresh catalyst) Activity  coefficient ) 0 ( ' ) ( ' ) ( = - - = t r t r t a A A 1 0 a(t) t a(t) may go up only  in pellet break up.
Background image of page 2
For  separable  kinetics the rate  can be written as -r A  = a(t) k(T) f(C A , C B ,…, C i ) Catalyst  decay rate   analogously  -r d  = -da/dt =p[a(t)]  k d (T) h(C A , C B ,…, C i ) k d  is decay constant h  is the functionality of r d  on concentrations For this chapter h = 1,    independent  of concentration   or h = C i   linear function of species where
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 4
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 11

Chap10Lecture6N - 10.7 Catalyst Deactivation Topics: Types...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online