Sustainable production of hydrogen via steam reforming of furfural (SRF) with Co-catalyst supported on sepiolite

Abstract

Natural sepiolite is a mineral very abundant in Spain, being the main producer worldwide. This material is presented by the first time as promised support to prepare cobalt catalysts with high activity and hydrogen selectivity in the steam reforming of furfural (SRF). Two methods for cobalt incorporation on natural sepiolite, precipitation (PP) and incipient wetness impregnation (IWI), are explored and their influence in the preparation of catalysts highly active and selective in the SRF is studied. PP method makes possible to synthesize a catalytic material with high catalytic performance (high conversion of furfural, > 95%, and high hydrogen selectivity, 70%). Furthermore the production of non-desired byproducts such as CO, CH4 and acetone, decrease significantly in the catalyst prepared by PP (CoSep). Characterization by N2 adsorption-desorption to determine surface area, XRD, TPR and TEM shows that PP method favors the formation of smaller metallic particles of Co with a high dispersion. These differential physicochemical properties seem to explain the better catalytic performance exhibited by the sepiolitic catalyst prepared by the PP method (CoSep). In addition, this catalyst exhibits also a higher resistance to deactivation after 24 hours of reaction time. This fact seems to be related to the lower coke deposition on the catalyst prepared by precipitation and particularly, with the lower sinterization of the metallic Co particles during the steam reforming of furfural.

Catalytic Steam Reforming of Ethanol to Produce Hydrogen: Modern and Efficient Catalyst Modification Strategies

“…A hydrothermal‐assisted impregnation approach was used to create M‐modified Ni/SEP catalysts (M=La, Mg, or Ca), and their catalytic performance for SRE was fully investigated. Sepiolite (SEP) is a mineral with the formula[Si 12 Mg 8 O 30 (OH) 4 (H 2 O) 4 .8H 2 O] is a magnesium‐rich hydrated silicate mineral with a wide natural distribution and low mining costs [96,97] . By collaborating with the surface alkaline/acid sites and metal‐support interaction, the surface Ni 0 active site quantity and Ni particle size play a vital role in promoting catalytic activity by enhancing the capability of cracking C−C and C−H bonds and influencing the coke deposition process.…”

“…Sepiolite (SEP) is a mineral with the formula[Si 12 Mg 8 O 30 (OH) 4 (H 2 O) 4 .8H 2 O] is a magnesium-rich hydrated silicate mineral with a wide natural distribution and low mining costs. [96,97] By collaborating with the surface alkaline/ acid sites and metal-support interaction, the surface Ni 0 active site quantity and Ni particle size play a vital role in promoting catalytic activity by enhancing the capability of cracking CÀ C and CÀ H bonds and influencing the coke deposition process. CaÀ Ni/SEP had the greatest carbon conversion (95 %) and hydrogen yield (65 %) among the modified catalysts, which was attributed to its well-dispersed small Ni particles, the most surface Ni 0 active species, and modified surface alkaline/acid sites.…”