Single‐Phase Formation of Rh₂O₃ Nanoparticles on h‐BN Support for Highly Controlled Methane Partial Oxidation to Syngas

Abstract

Single-phase formation of active metal oxides on supports has been vigorously pursued in many catalytic applications to suppress undesired reactions and to determine direct structure-property relationships.H owever,t his is difficult to achieve in nanoscale range because the effect of nonuniform metal-support interfaces becomes dominant in the overall catalyst growth, leading to the nucleation of various metastable oxides.H erein, we develop as upported singlephase corundum-Rh 2 O 3 (I) nanocatalyst by utilizing controlled interaction between metal oxide and h-BN support. Atomicresolution electron microscopya nd first-principle calculation reveal that single-phase formation occurs via uniform and preferential attachment of Rh 2 O 3 (I) (110) seed planes on welldefined h-BN surface after decomposition of rhodium precursor.B yu tilizing the Rh/h-BN catalyst in methane partial oxidation, syngas is successfully produced solely following the direct route with keeping aH 2 /CO ratio of 2, whichm akes it ideal for most downstream chemical processes.

Unraveling the Unique Promotion Effects of a Triple Interface in Ni Catalysts for Methane Dry Reforming

“…Recently, boron nitride (BN) has shown outstanding performance in various catalytic reactions, as well as excellent resistance to carbon deposition, due to its unique electronic properties. − The interfaces between BN and metal nanoparticles can be well-constructed due to the two-dimensional atomic crystals of BN. The interfaces of metal nanoparticles and BN were reported to enhance the methanation activity and inhibit coke formation. , Meanwhile, the weak interaction between BN and metal nanoparticles is beneficial for the absorption of gas molecules over the interface .…”

Heteroepitaxial Growth of B5‐Site‐Rich Ru Nanoparticles Guided by Hexagonal Boron Nitride for Low‐Temperature Ammonia Dehydrogenation

“…Many 2D materials, including h-BN, have been synthesized on substrates with the same symmetry and similar lattice parameters, [30] and one specific phase of Rh 2 O 3 nanocrystals has been synthesized on h-BN(001) with its lattice aligned to the h-BN lattice. [31] Accordingly, atomically clean surfaces with hexagonal lattice structure such as highly ordered pyrolytic graphite will induce the formation of epitaxial Ru nanoparticles. [27] Nonetheless, the use of h-BN as a support provides an additional advantage.…”

Integrated in situ spectroscopic studies on syngas production from partial oxidation of methane catalyzed by atomically dispersed rhodium cations on ceria

“…Compared to SRM and DRM, a partial oxidation of methane (POM) is attractive; 11,12 it circumvents the request of high temperature since it is essentially exothermic and can produce syngas with an ideal ratio of H 2 /CO at 2/1, a favorable composition for the production of significant intermediate compounds including methanol, one of the most important raw materials in chemical and energy industries. 6,13 CH 4 has the highest H/C ratio (4) among all hydrocarbons. It is difficult to activate its C-H bonds because the sp 3 hybridization of the atomic orbitals of carbon atoms makes the C-H bonds quite strong with a bond energy as high as 439 kJ mol À1 .…”

“…Compared to SRM and DRM, a partial oxidation of methane (POM) is attractive; 11,12 it circumvents the request of high temperature since it is essentially exothermic and can produce syngas with an ideal ratio of H 2 /CO at 2/1, a favorable composition for the production of significant intermediate compounds including methanol, one of the most important raw materials in chemical and energy industries. 6,13…”