Promoted RhPt bimetallic catalyst supported on δ-Al2O3 and CeO2–ZrO2 during full-scale autothermal reforming for automotive applications: Post-mortem characterization

Recent advances in diesel autothermal reformer design

“…High activity and stability, however, are threatened by the above-mentioned coke deposits and, additionally, by adsorbing sulfur-and phosphorouscontaining components, which might block the catalytically-active sites on the catalyst surface being no longer accessible for the reactants. There are numerous papers in the literature regarding experimental investigations in this respect [48][49][50][51][52][53][54][55][56][57][58][59][60]. Although the formation of coke deposits on the catalyst surface is known to be one of the most important reasons for catalyst deactivation, only a few papers deal with a priori technical approaches to suppress them [23,[61][62][63][64].…”

Surface Properties of Rh/AlPO4 Catalyst Providing High Resistance to Sulfur and Phosphorus Poisoning

“…Poisoning occurs when oxidized fuel- and oil-derived contaminants and/or additives are adsorbed or deposited onto the catalyst surface. In the case of phosphorus poisoning, an engine oil additive, zinc dialkyldithiophosphate (ZDDP), is oxidized during the combustion process and deposited as glassy overlayers of phosphates that cover the catalyst surface. − The dense and stable overlayers that form as a result cause pore blockage, loss of surface area, and occlusion of active precious metals. , The as-deposited phosphate in part reacts with the porous Al 2 O 3 support to yield AlPO 4 , and further reactions with the oxygen storage material CeO 2 yield CePO 4 , which deteriorates the oxygen storage performance. , The poisoning effects of sulfur have also been studied extensively. − It is well-known that SO 2 adsorption probes the surface basic site. , Strong chemisorption of SO 2 onto the surface of precious metals blocks the adsorption and catalytic reactions of NO, CO, and hydrocarbons. Under a reducing atmosphere, the chemisorbed SO 2 is reduced to elemental sulfur, which is also strongly bound to the metal surface unless sufficient concentrations of oxygen are present in the gas phase.…”

Development of a Catalytic Fuel Processor for a 10 kW Combined Heat and Power System: Experimental and Modeling Analysis of the Steam Reforming Unit

“…Preliminary investigations within the research project and previous studies from the literature on catalysts (e.g., mixed oxides vs. noble metal based catalysts) [14,15], reactor designs (packed bed of pellets vs coated monoliths or foams) [16][17][18][19], fuel processor solution and layout (partial oxidations vs. steam reforming, H2 purification stages vs. membrane reactors) [19][20][21][22][23][24], have led to the configuration schematically represented in Figure 1. Natural gas and H 2 O are fed to a steam reformer unit, heated by the burner which is co-fueled by the proton-exchanged membrane (PEM) stack tail gas.…”