Effect of Realistic Operating Considerations on Preferential Oxidation of CO and Regulatory Strategies:A Review and Perspectives
In the realm of hydrogen production for fuel cell applications,H2 must be refined to ultra-high purity levels es-sential for the functionality of fuel cells.Various methods are available for removing trace contaminants from effluent gas streams,falling into the broad categories of adsorption,membranes,scrubbers,and selective reactions.Preferential oxidation of carbon monoxide(CO-PROX)plays a pivotal role in ensuring the purity of hydrogen-rich gases.This catalytic process selectively removes CO impurities,typically requiring reduction to concentrations below 0.001％,thereby enabling the sup-ply of high-purity H2 to fuel cells.While much existing research utilizes idealized conditions and simulated reformate gas compositions for evaluating novel CO-PROX catalyst materials,it tends to somewhat overlook the real operational factors(water vapor and carbon dioxide),reactor design,and mass/heat transfer.Unlike the singular improvement of catalytic per-formance under ideal experimental conditions,the practical application of CO-PROX necessitates consideration of unavoida-ble factors,such as the upstream hydrogen source and the downstream anode tolerance of fuel cell.It is also imperative to design an optimized CO-PROX reactor that takes into account realistic operating conditions.This comprehensive review delves into the multifaceted aspects of CO-PROX.mainly focusing on the impact of water vapor(H2O),carbon dioxide(CO2),and other practical operational considerations.The analysis encompasses their inhibitory and promotional effects on CO-PROX reactions.In addition,we summarize and suggest possible strategies for enhancing CO-PROX tolerance in this work.The catalytic performance can be augmented by modulating the reaction temperature and the feed atmosphere,and catalyst could be activated through pre-treatment with specific atmosphere.High-tolerability CO-PROX catalysts can be de-veloped by meticulously selecting appropriate supports and active-sites.Furthermore,several studies have successfully ele-vated the reaction performance by integrating insights from other research disciplines.Thereby,this review serves as a valua-ble reference bridging fundamental research with practical engineering applications within the CO-PROX domain.
preferential oxidation of COH2O and CO2 factorsinhibition/promotion effectregulatory strategy
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