Integrating Pd-doped perovskite catalysts with ceramic hollow fibre substrate for efficient CO oxidation

Abstract

Doping Pd into perovskite catalysts helps to reduce light-off temperatures, improve thermalchemical stability and lowered catalyst cost by decreasing Platinum Group Metals (PGMs). In this study, LaFe0.7Mn0.225Pd0.075O3 (LFMPO) and LaFe0.7Co0.225Pd0.075O3 (LFCPO) were synthesised, characterized and evaluated for catalytic treatment of automotive emissions, using CO oxidation as the model reaction. Such catalysts were further incorporated inside microstructured ceramic hollow fibre substrates, and compared with a packed bed configuration by light-off temperatures. Performance evaluations suggest that, LFMPO deposited inside the hollow fibre substrate could be light up at 232 o C, which is 10 o C lower than a packed-bed counterpart with the same amount of catalyst (5 mg) and GHSV of ~5300 h -1 . While excessive incorporation of the catalyst (10 mg) generates significantly higher transfer resistance, which impairs catalytic performance of hollow fibre reactors, with CO conversion per gram of catalyst reduced from 0.01 mole g -1 to 0.0051 mole g -1 .

Scaling up a hollow fibre reactor: A study on non-PGM hollow fibre after-treatments for methane emission control under extreme conditions

“…2C and 2D. It is also possible that certain entry pores to the finger micro-channels could have been blocked due to an excessive catalyst load [29]. Nevertheless, since the used catalyst is inexpensive (2.64 $/Kg) and volume is the main constraint of the real application of this technology, a trade-off between a large catalyst loading density and a less efficient catalyst use is justified.…”

“…Even though hollow fibre reactors have been studied as a suitable candidate for methane emission control technologies [25,27,29,30], it has not yet been proven that this technology is scalable and suitable for continuous real operation. By scalable it is meant that hollow fibre reactors can be combined into a larger structurally and mechanically all-encompassing unit composed of multiple hollow fibres bound together.…”

Hollow Fibre Adsorption Unit for On-Board Carbon Capture: The Key to Reducing Transport Emissions

“…As shown in Figure 5 A, HFAU3 possessed the highest total and effective capacity per unit length out of the five HFAUs. This behaviour can be explained by the thin coating of CaO that was deposited inside the fingers of HFAU3 which maximised the surface area offered by the 𝛼-Al 2 O 3 hollow fibre support, see Figure 4 ( Mahyon et al, 2020 ). For HFAU1 and HFAU2, the deposition of CaO particles inside the fingers left surface area uncovered and not fully exploited, while for HFAU4 and HFAU5, the fingers were saturated with CaO.…”