Investigation on the Redox Properties of a Novel Cu-Based Pr-Modified Oxygen Carrier for Chemical Looping Combustion

Abstract

CO2 levels in the atmosphere are growing as a result of the burning of fossil fuels to meet energy demands. The introduction of chemical looping combustion (CLC) as an alternative to traditional combustion by transporting oxygen emphasizes the need to develop greener and more economical energy systems. Metal oxide, also defined as an oxygen carrier (OC), transports oxygen from the air to the fuel. Several attempts are being made to develop an OC with a reasonable material cost for superior fuel conversion and high oxygen transport capacity (OTC). This study aims to synthesize a potential OC using the wet impregnation method for the CLC process. Thermogravimetric analysis (TGA) was used to determine the cyclic redox properties using 5% CH4/N2 and air as reducing and oxidizing gases, respectively. The 10CuPA-based OC retained a high OTC of about 0.0267 mg O2/mg of OC for 10 cycles that was higher than 10CuA-based OC. Furthermore, the oxygen transfer rate for 10CuPA-based OC was relatively higher compared to 10CuA-based OC over 10 cycles. In comparison to 10CuA-based OC, the 10CuPA-based OC presented a steady X-ray diffraction (XRD) pattern after 10 redox cycles, implying that the phase was stably restored due to praseodymium-modified γ alumina support.

A Comparative Study of Eggshell and Commercial Sorbent-Based Catalysts through Synthesis and Characterization for SESR Process

“…Coal gasification [7], thermochemical water splitting [8], chemical looping technology [9,10], direct methane decomposition [11], steam methane reforming (SMR) [12], and partial oxidation of methane [13] are established techniques for H 2 generation. Among these techniques, and despite its disadvantages, such as increased energy usage and reaction complications, SMR has been implemented at the industrial scale [14].…”

“…From an economic standpoint, noble metals are not favored [15]. Furthermore, as the reaction progresses, the activity of Ni-based catalysts reduces due to carbon deposition [24][25][26]. The addition of a suitable support, such as Al or Mg, increases the surface area of the catalyst and retarded carbon deposition [27,28].…”