Sorption enhanced reaction for high purity products in reversible reactions

Abstract

Reversible reactions (A 1 B 5 C 1 D) can be performed to near completion using an admixture of catalyst and sorbent that will selectively adsorb one of the reaction products. For an initially clean sorbent and a favorable adsorption isotherm and a long reactor, the adsorbed product, C, will propagate as a sharp, shock-like front. While the adsorbed product will not move faster than this front, the second, nonadsorbed product, D, will, in principle, leave the reactor, uncontaminated. However, a parametric analysis of the two examples presented in this work, the water gas shift and the cracking of hydrogen sulfide, reveals an unexpectedly complex behavior. While assuming adsorption equilibrium the effect of the equilibrium constant, the reaction kinetics and adsorption isotherm on the reactant and product concentration profiles are simulated. It is found that desired behavior is favored by large equilibrium constants, rapid kinetics, and strong nonlinear adsorption. Figure 6. Effects of different K eq on the CO concentration profile inside the reactor when t 5 146 s, K r 5 2.039 mol/(sÁkgÁkPa) and K c 5 0.374 kPa 21 .

Olive Mill Wastewater Valorization through Steam Reforming Using Multifunctional Reactors: Challenges of the Process Intensification

“…One of those alternatives for the process intensification of the OMWSR is the utilization of a SER (see Figure 10), which consists of combining the TR and CO 2 sorption in the same reactor. This innovative configuration allows shifting the thermodynamic equilibrium of the steam reforming reaction by removing one of the products (in this case CO 2 ) from the reaction medium-Le Chatelier principle [160,161]. This reactor configuration was already used in multiple applications [109, in the last decade.…”

Development of an effective bi-functional Ni–CaO catalyst-sorbent for the sorption-enhanced water gas shift reaction through structural optimization and the controlled deposition of a stabilizer by atomic layer deposition

“…Besides the capture of CO 2 , CaO-based sorbents have the potential to be integrated in processes that combine CO 2 capture with a catalytic reaction, e.g., steam reforming [46][47][48][49][50] and/ or the water-gas shi reaction [51][52][53][54] to yield high-purity H 2 . For example, a typical composition of the effluent gas of an industrial water-gas shi unit is approximately 76% H 2 , 17% CO 2 , 3% CO, and 4% CH 4 .…”