Monodisperse Sr–La₂O₃hybrid nanofibers for oxidative coupling of methane to synthesize C₂hydrocarbons

Abstract

The synergistic effects from combinations of each component's functionality in hybrid Sr-La2O3 nanofibers brought about an improved catalytic behaviour for oxidative coupling of methane carried out at high temperatures, which cannot be achieved over the conventional Sr doped La2O3 spherical catalyst.

Correlation between the acid–base properties of the La2O3 catalyst and its methane reactivity

“…Combining eqn (3) to (5), we obtain an expression for the reaction energy in terms of the acid-base properties of the La 3+ -O 2À pair site as shown in eqn (6), where c 0 is a sum of all the constant terms.…”

“…2,3 As a result, a large number of OCM catalysts have been developed during the past three decades, although none of them have been commercialized mainly due to the limited yield of C 2 products (C 2 H 6 and C 2 H 4 ). 5,6 Therefore, there is great interest in further optimizing these catalysts by elucidating their catalytic mechanisms and investigating their structureperformance relationship. 5,6 Therefore, there is great interest in further optimizing these catalysts by elucidating their catalytic mechanisms and investigating their structureperformance relationship.…”

Process intensification in the catalytic conversion of natural gas to fuels and chemicals

“…Nano-structured catalysts activate the methane 13 13:50 ] at lower temperatures [111,140] . Nano-structured (nanowire, nanorods, nanofibers) La 2 O 3 , Sr-La 2 O 3 and La 2 O 3 -CeO 2 catalysts delivered superior OCM performance compared to the same catalysts in powder form [111,[141][142][143] . Song et al [142] developed a stable Sr-La 2 O 3 nanofiber catalyst that delivered approximately 16% C 2 yield at 500 °C, with the catalyst being stable up to 800 °C.…”

“…Nano-structured (nanowire, nanorods, nanofibers) La 2 O 3 , Sr-La 2 O 3 and La 2 O 3 -CeO 2 catalysts delivered superior OCM performance compared to the same catalysts in powder form [111,[141][142][143] . Song et al [142] developed a stable Sr-La 2 O 3 nanofiber catalyst that delivered approximately 16% C 2 yield at 500 °C, with the catalyst being stable up to 800 °C. The catalytic activity of nanorods and nonofibers is attributed to high surface areas, well defined crystalline structures, and the ability to form surface oxides [141] .…”

“…The catalyst activity is found to depend not only on the catalyst's metal composition, but also on particle size and morphology [140][141][142][143] . Nano-structured catalysts activate the methane 13 13:50 ] at lower temperatures [111,140] .…”