Extended reactor concept for dynamic DeNOx design

A bidirectional fixed‐bed reactor for coupling of exothermic and endothermic reactions

“…Eigenberger and Nieken (1988) investigated the catalytic combustion of hydrocarbons with periodic flow reversal using the Crank-Nicolson numerical algorithm developed by Eigenberger and Butt (1976). Agar and Ruppel (1988) used an implicit finite-difference approximation to study NO, removal in the presence of ammonia and air by forced flow reversal in a fixed-bed reactor. Rakowski (1988, 1989), using a combination of the method of characteristics and orthogonal collocation, investigated the operation of an adiabatic tubular reactor forced through the reversal of flow of the reaction mixture.…”

Experimental investigation of the SCR of NOx in a simulated moving bed reactor

“…Chromatographic separations can be achieved in the RFR if the reactor is packed with an adsorbent, or with a mixture of adsorbent and catalyst, with a high adsorption capacity toward a reactant and low toward a product, so that the periodic switching of the feed traps the strongly adsorbed reactant inside the reactor. The Selective Catalytic Reduction (SCR) of NO x with ammonia in the presence of a catalyst that strongly adsorbs the ammonia was proposed in the past8‐10 as a process that can be carried out in an RFR taking advantage of this mode of reactor operation. Some authors9, 11 proposed various solutions to avoid wash out of unconverted ammonia, but, in our mind, the most effective and efficient solution is the SMB reactor made of two or three reactors connected in a closed sequence and with a set of valves that enable changing the feed position, thus simulating the behavior of a moving bed and achieving a sustained dynamic behavior 12, 13…”

Enhanced hydrogenation in a reverse flow chromatographic reactor

“…Agar and Ruppel (1988) and Falle et al (1995) have previously studied the RFCR. Their study was limited to a first‐order irreversible reaction, the selective catalytic reduction (SCR) of NOx by NH 3 , where only ammonia is adsorbed and is the reactant fed at the middle of the reactor.…”