Synthesis of olefins by selective hydrodeoxygenation of lignocellulosic ketones

Abstract

The selective hydrodeoxygenation (HDO) of lignocellulose-derived ketones to olefins is a promising method for the upgrading of lignocellulosic biomass-derived molecules. Herein, zinc molybdate (ZnMoO4-E) with disordered layered stacking structure was...

Manufacture of olefins by the selective hydrodeoxygenation of lignocellulosic ketones over a cobalt molybdate catalyst

“…8, the coexistence of Mo 6+ , Mo 5+ and Mo 6+ is evidenced by the Mo 3d XPS spectra of reduced MoO 3 , MoO 3 /CoO and CoMoO 4 catalysts. According to the literature, 4,29 the peaks at about 232.1 eV and 235.3 eV can be assigned to Mo 6+ species, the peaks at 230.4 eV and 233.6 eV can be attributed to Mo 5+ species, and the peaks at about 229.5 eV and 232.8 eV can be assigned to the Mo 4+ species. The O 1s XPS spectra of reduced MoO 3 , MoO 3 /CoO and CoMoO 4 catalysts have two peaks at about 531.4 eV and 530.5 eV.…”

“…Based on the results of XPS and UV-Vis spectra, the reduced CoMoO 4 catalyst has higher oxygen vacancy concentration than the reduced MoO 3 and MoO 3 /CoO catalysts. In some previous literature, 4,30,36 it has been suggested that the oxygen vacancies generated by partially reduced metal oxide catalysts can serve as Lewis acid sites. This may be the reason why the reduced CoMoO 4 catalyst has higher concentration of acid sites.…”

“…1,2 In recent years, the catalytic conversion of lignocellulose to hydrogen, methane, liquid biofuels and value-added chemicals has aroused widespread concern. 3,4 Olefins are basic feedstocks in the production of fuels, lubricants, drugs, cosmetics, polymers, coatings, surfactants, detergents, etc. 5 Traditionally, olefins are mainly obtained by dehydrogenation of alkanes, metathesis, catalytic cracking and pyrolysis from nonrenewable petrochemical resources.…”

“…1,2 In recent years, the catalytic conversion of lignocellulose to hydrogen, methane, liquid biofuels and value-added chemicals has aroused widespread concern. 3,4…”

Decarboxylative [4 + 2] cycloaddition via ligand-to-metal charge transfer photoexcitation of a Cu-MOF

“…13 More recently, our group reported a much milder strategy (140 °C, 1 bar) for furan cycloaddition to produce PX via a different decarboxylation pathway (Scheme 1b) upon a POM@MIL-100(Fe) catalyst (POMs: polyoxometalates). 14 In that reaction, decarboxylation of AA, via a single electron transfer (SET) process induced by ligand-to-metal charge transfer (LMCT) between Fe(III)-carboxylates, preferentially occurred at 140 °C, thus avoiding formation of the 2,5-dimethylbenzoic acid intermediate. However, ∼14% of p-tolyl-2,5-xylylmethane (PTX) was formed in the products due to the high temperature and long reaction time (24 h).…”