Concerning the regenerative manner and the regenerative hydrogen treating catalytic converter null used catalytic converter

摘要

PROBLEM TO BE SOLVED: To recycle a catalyst, which is deactivated and then, not utilized after use, by controlling metal tolerance MPr expressed by a specific equation to equal to or above a specific value.;SOLUTION: The metal tolerance MPr expressed by the equation is an index of the deposited quantity of vanadium tolerable so far as the catalyst is deactivated to come to end of the life. The tolerable quantity of deposited vanadium is increased with increase in the value. MPr is ≥1, preferably ≥3. The equation: (PV/2Vv)×{8×105×(PD)1.3]×(SP/Vp)-VA, (wherein, PV is fine pore volume (m3/kg) when the catalyst is new; Vv is the volume (which is 3.8×10-6 (m3/%kg)) when 1 wt.% vanadium deposited on 1 kg new catalyst is expressed in terms of vanadium sulfide; PD is the average fine pore diameter (m) of the new catalyst; Sp is the outside surface area (m2) of a piece of the grain when the catalyst is new; Vp is the average volume (m3) of a piece of the grain when the catalyst is new; VA is the quantity of the deposited vanadium (wt.%) based on the new catalyst as reference.;COPYRIGHT: (C)2000,JPO