Isolated boron in zeolite for oxidative dehydrogenation of propane

Abstract

Oxidative dehydrogenation of propane (ODHP) is a key technology for producing propene from shale gas, but conventional metal oxide catalysts are prone to overoxidation to form valueless COx. Boron-based catalysts were recently found to be selective for this reaction, and B–O–B oligomers are generally regarded as active centers. We show here that the isolated boron in a zeolite framework without such oligomers exhibits high activity and selectivity for ODHP, which also hinders full hydrolysis for boron leaching in a humid atmosphere because of the B–O–SiOx linkage, achieving superior durability in a long-period test. Furthermore, we demonstrate an isolated boron with a –B[OH…O(H)–Si]2 structure in borosilicate zeolite as the active center, which enables the activation of oxygen and a carbon–hydrogen bond to catalyze the ODHP.

Surface Molecule Manipulated Pt/TiO2 Catalysts for Selective Hydrogenation of Cinnamaldehyde

“…Previous attempts to improve the chemoselectivity of metal nanocatalysts mainly focused on controlling the size, shape and composition of metal NPs, and, the interactions between metal and supports (1-6). More recent researches have seen an increased focus on understanding the interactions between adsorbates at nanoscale interfaces of heterogeneous catalysts (7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24). But, how these interactions can be precisely regulated to tune the chemical reactivity remains elusive.…”

Relationship between Acidity and Activity on Propane Conversion over Metal-Modified HZSM-5 Catalysts

“…The increasing energy demand and reducing fossil fuel resources make it imperative to develop new processes for the production of transportation fuels and chemicals. Catalytic conversion of light alkanes to more valuable chemicals, commodities, and fuels has attracted much attention in recent years [1][2][3]. Giving the scarcity of fossil fuels and suddenly increased low-cost light alkanes supplement from the shale gas revolution, propane conversion is becoming popular, and is regarded as an attractive way to meet the increasing demand for propylene and aromatics [4][5][6].…”

Propane to olefins tandem catalysis: a selective route towards light olefins production

“…55 OPDH is however competing with dry reforming of propane (3CO 2 + C 3 H 8 " 6CO + 4H 2 ), so that selective catalysts are needed. Boron-based catalysts have been proposed for the OPDH reaction using oxygen as an oxidizer (e.g., B-substituted zeolites 141,142 and hexagonal BN or BN nanotubes 143 ). Future studies should focus on the application of such catalysts in combination with CO 2 as an oxidant and in deriving structureactivity relationship principles to guide catalyst design.…”