A High-Throughput Screening Approach to Identify New Active and Long-Term Stable Catalysts for Total Oxidation of Methane from Gas-Fueled Lean–Burn Engines

Abstract

A unique high-throughput approach to identify new catalysts for total oxidation of methane from the exhaust gas of biogas-operated lean-burn engines is presented. The approach consists of three steps: (1) A primary screening using emission-corrected Infrared Thermography (ecIRT). (2) Validation in a conventional plug flow gas phase reactor using a model exhaust gas containing CH4, O2, CO, CO2, NO, NO2, N2O, SO2, H2O. (3) Ageing tests using a simplified exhaust gas (CH4, O2, CO2, SO2, H2O). To demonstrate the efficiency of this approach, one selected dataset with a sol-gel-based catalysts is presented. Compositions are 3 at.% precious metals (Pt, Rh) combined with different amounts of Al, Mn, and Ce in the form of mixed oxides. To find new promising materials for the abatement of methane, about two thousand different compositions were synthesized and ranked using ecIRT, and several hundred were characterized using a plug flow reactor and their ageing behaviour was determined.

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

“…Previous works using both PGM and non-PGM catalysts agree that sulfur dioxide is responsible for the deactivation of methane emission control catalysts [8][9][10]13,15,23]. In the study presented herein, a concentration of 100 ppmV of sulfur dioxide has been used, a concentration which is 100 times higher than that present in emissions from natural gas power plants.…”

“…1: Cost-effectiveness analysis of the main catalysts studied over the past 5 years. Ref -PGM: A [6], B [7], C [8], D [9], E [10], F [11], G [12], H [13] and I [14]. Non-PGM: J [15], K [16], L [17], M [18], N [19], O [20], P [21], Q [22] and R [23].…”

“…1. As can be seen, two types of catalysts are currently used for the total oxidation of residual methane: platinum group metals (PGM) [6][7][8][9][10][11][12][13][14] and non-platinum group metals (non-PGM) [15][16][17][18][19][20][21][22][23]. The data shown in Fig.…”