Sustainable Production of Acrylic Acid: Catalytic Performance of Hydroxyapatites for Gas-Phase Dehydration of Lactic Acid

Production of acrylic acid from biomass-derived allyl alcohol by selective oxidation using Au/ceria catalysts

Acrylic acid can be selectively produced from biomass-derived allyl alcohol using an oxidic Au/ceria catalyst prepared by the deposition–precipitation method.

Production of propionic acid via hydrodeoxygenation of lactic acid over FexOy catalysts

Efficient synthesis of propionic acid from lactic acid using Fe_yO_x catalyst via hydrodeoxygenation has been achieved.

Control of calcium accessibility over hydroxyapatite by post-precipitation steps: influence on the catalytic reactivity toward alcohols

Hydroxyapatites exhibit Ca²⁺ and POH surface acid sites, which relative accessibilities can be varied by synthesis to tune the catalytic reactivity toward alcohols.

Elastic, crosslinked poly(acrylic acid) filaments: nanocellulose reinforcement and graphene lubrication

Hybrid monofilaments of poly(acrylic acid) (PAA) and 1,6-hexanediol diglycidyl ether (16DGE), compounded with nanofibrillated cellulose (NFC) and graphene, were thermally crosslinked and subsequently spun from aqueous solution.

Sustainable production of acrylic acid: alkali-ion exchanged beta zeolite for gas-phase dehydration of lactic acid

Gas-phase dehydration of lactic acid (LA) to acrylic acid (AA) was investigated over alkali-exchanged β zeolite (M(x)Na(1-x)β, M=Li(+), K(+), Rb(+), or Cs(+)) of different exchange degrees (x). The reaction was conducted under varying conditions to understand the catalyst selectivity for AA production and trends of byproduct formation. The nature and exchange degree of M(+) were found to be critical for the acid-base properties and catalytic performance of the exchanged zeolite. K(x)Na(1-x)β of x=0.94 appeared to be the best performing catalyst whereas Li(x)Na(1-x)β and Naβ were the poorest in terms of AA selectivity and yield. The AA yield as high as 61 mol % (selectivity: 64 mol %) could be obtained under optimized reaction conditions for up to 8 h over the best performing K0.94Na0.06β. The acid and base properties of the catalysts were probed, respectively by temperature-programmed desorption (TPD) of adsorbed NH3 and CO2, and were related to the electrostatic potentials of the alkali ions in the zeolite, which provided a basis for the discussion of the acid-base catalysis for sustainable AA formation from LA.

The effect of K2HPO4 and Al2(SO4)3 modified MCM-41 on the dehydration of methyl lactate to acrylic acid

K₂HPO₄ + Al₂(SO₄)₃/MCM-41 shows good methyl lactate dehydration activity and acid–basic balance is important for the acrylic acid selectivity.

Nonstoichiometric calcium pyrophosphate: a highly efficient and selective catalyst for dehydration of lactic acid to acrylic acid

Lactic acid dehydration using a non-stoichiometric calcium pyrophosphate catalyst (Ca/P ratio 0.78) has resulted in 78% acrylic acid yield due to formation of calcium lactate as an intermediate on the catalyst surface.