Methods for treatment of phosphomolybdic acid based catalysts du

Details Methods for treatment of phosphomolybdic acid based catalysts du Methods for treatment of phosphomolybdic acid based catalysts du

1983-05-24

1984-09-11

Konopka, P. E.

Catalyst, solid sorbent, or support therefor: product or process

Regenerating or rehabilitating catalyst or sorbent

Gas or vapor treating

2604653, 560214, 562531, 562532, 562534, 562535, 562599, B01J 2728, C07C 5125, C07C 51377, C07C 57055

Patent

active

044710615

ABSTRACT:
The present invention relates to a method for maintaining the activity of PMA based catalysts during reactor shutdown by flushing the reactor with an oxide of nitrogen gas at a temperature of from about 150.degree. C. to about 370.degree. C. The method can be employed in the reactor by terminating the feed of hydrocarbon to the reactor and then flushing the reactor. The method can be employed to treat PMA based catalysts having the general formula Mo.sub.x P.sub.y A.sub.a B.sub.b C.sub.c D.sub.d E.sub.e O.sub.z wherein A is selected from the group consisting of ammonium, cesium, potassium, rubidium and thallium; B is selected from the group consisting of copper and vanadium; C is selected from the group consisting of antimony, arsenic, bismuth and tellurium; D is palladium; E is aluminum, barium, calcium, cerium, chromium, cobalt, iron, magnesium, manganese, nickel tantalum, titanium, tungsten, zinc, zirconium, chlorine and/or bromine; x can be 3 to 15, y can be 1 to 1.5; a can be 0.1 to 3; b can be 0.1 to 3; c can be 0 to 2; d can be 0 to 2; e can be 0 to 4 and z is a number necessary to satisfy the valence of all the other elements.

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