Aromatic chemicals by iron-catalyzed hydrotreatment of lignin pyrolysis vapor.

Lignin is a potential renewable material for the production of bio-sourced aromatic chemicals. We present the first hydrotreatment of lignin pyrolysis vapors, before any condensation, using inexpensive and sustainable iron-silica (Fe/SiO2 ) and iron-activated carbon (Fe/AC) catalysts. Lignin pyrolysis was conducted in a tubular reactor and vapors were injected in a fixed bed of catalysts (673 K, 1 bar) with stacks to investigate the profile of coke deposit.

Acetylene hydrogenation over Ni-Cu nanoparticles supported on silica prepared by aqueous hydrazine reduction.

Non conventional nickel (1%) and nickel (1%)-copper (0.2-0.75%) catalysts supported on silica, prepared by aqueous hydrazine reduction of nickel acetate at 70 degrees C, were studied in acetylene hydrogenation, mainly at 60 degrees C.

Study of support effects on the reduction of Ni2+ ions in aqueous hydrazine.

We have studied the effect of silica of quartz-type on the reducibility of nickel acetate in aqueous hydrazine (80 degrees C, pH = 10-12) and metal particle formation. The obtained materials were characterized by X-ray diffraction, transmission electron microscopy, and thermodesorption experiments. With nickel acetate alone, the reduction was partial (45%) and a metal film at the liquid-gas interface or a powdered metal precipitate with an average particle size of 120 nm was obtained.