Structure and Catalytic Property of Coherent Spinel Surface Layers on Hexaaluminate Microcrystals

Highly Active Ruthenium Catalyst Supported on Barium Hexaaluminate for Ammonia Decomposition to COx-Free Hydrogen

“…Obviously, BHA resembles BaO rather than γ-Al 2 O 3 in terms of acidity and basicity, despite the fact that the molar fraction of Ba 2+ to Al 3+ in BHA is only 1/12. This can be explained by the layered structure of BHA that BaO-containing planes intercalate into the alumina spinel blocks. , Therefore, this special structural configuration can be used to explain the reason why BHA has identical basicity with that for BaO.…”

Electronic and structural promotion of barium hexaaluminate as a ruthenium catalyst support for ammonia synthesis

“…4), in which alumina spinel blocks are intercalated by mirror planes containing [BaO] [55]. γ -Al 2 O 3 also constitutes defective spinel blocks, and in this respect the structures of BHA and γ -Al 2 O 3 bear some resemblance.…”

“…The crystalline structure of BHA has been widely investigated [54][55][56][57][58][59]. According to Kimura et al [58,59], the compound BaAl 12 shows the layered BHA structure formed by the present microemulsion synthesis.…”

Waste-free scale up synthesis of nanocrystalline hexaaluminate: properties in oxygen transfer and oxidation reactions

“…catalytic combustion. 9 Some perovskite-based structures (ABO 3 where A x+ and B y+ are respectively lanthanides and transition metal cations), also exhibit high activity. 10 These materials however suffer from a dramatic surface area decrease at high temperature, making them less attractive than hexaaluminates for high temperature reactions.…”