Interconnection between feed composition and Ni/Co ratio in (La-Ni-Co-O)-based perovskites and its effects on the stability of LPG steam reforming

Synergy Effects of Cobalt Oxides on Ni/Co-Embedded Al2O3 for Hydrogen-Rich Syngas Production by Steam Reforming of Propane

“…The synergetic effects of the oxophilic Co nanoparticles for the Ni-based reforming catalysts were largely investigated in terms of the metal-support interactions and coke resistance [6,25]. In the case of catalytic reforming reaction of hydrocarbons, it was well reported that those interactions not only enhanced the metal dispersion to promote the catalytic activity, but also lessened the coke deposition to enhance the catalytic durability.…”

“…This suggests that the Ni and Co metals have some additional synergy effects through the proper distributions of the active metallic Co nanoparticles on the NCA surfaces as well as optimal formations of the thermally stable spinel CoAl 2 O 4 and NiAl 2 O 3 phases on the bulk CA(2) support [12,32,33,37], as explained in the following section. In addition, the highly reduced NCA(0.5) and NCA(1) revealed a slightly lower H 2 selectivity of 70.1-71.2% and higher CH 4 selectivity of 4.4-5.2% compared to the less reduced NCA(2) with those values of 73.2% and 2.0%, which can be possibly attributed to the more preferential methanation activity as well as coke depositions by possibly inducing the smaller contributions of SRM activity on the metallic Co and Ni surfaces [4][5][6][7][8]33]. 1 SRP reaction was performed at the reaction conditions of T = 650 °C, P = 0.1 MPa and SV = 170,000 L/(kgcat•h) by using a feed gas composition of C3H8/N2/H2O = 1:4:9 for 12 h on stream.…”

“…Although propane can be easily decomposed in the operation temperatures of 500-800 • C due to its highly endothermic and irreversible natures in thermodynamics with their faster rates, there are not only the reforming reaction but also thermolysis at high temperature, which largely generating solid carbons under the reaction conditions compared to the SRM reaction [5]. Furthermore, since carbon depositions generally originate from Boudouard reactions and thermal hydrocarbon decompositions during the processes, more delicate efforts should be endeavored to maintain the stable catalytic activity [6][7][8].…”

Hydrogen Production from Light Hydrocarbons

“…They obtained that Rh/CeO 2 catalyst gave the highest H 2 yield. Steam reforming of LPG employing nickel-based perovskites (La-Ni-O) partly replaced with cobalt was examined [57]. The suitable selection of water/LPG feed ratio together with the proper Co/Ni ratio in the synthesis of perovskite precursors was vital to retain the catalyst active during LPG steam reform and hence the hydrogen production.…”