Work Package 4 (WP4) of the European research project ASCENT developed combined sorbent-catalyst materials (CSCM) for sorption enhanced steam methane reforming (SESMR), based on nickel (Ni) and calcium oxide (CaO). ASCENT WP4 experiment on Ni/CaO/mayenite systems obtained from wet mixing and wet impregnation synthesis methods was conducted. Effects from Ni precursor (Ni (CH3COO)2 · 4H2O or Ni(NO3)2 · 6H2O), Ni load (from 3 wt.%-10 wt.%), and free CaO load (from 0 wt.%-54 wt.%) were investigated for 26 materials through characterizations and reforming reactivity tests in a packed-bed microreactor (650°C, 1 atm). Evidence emerged about the detrimental influence of low Ni/CaO ratio on the reforming catalytic activity of solid inventories, made of CSCM or even of the raw mixing of CaO-mayenite and Ni-mayenite particles. Catalytic materials were active towards reforming only when derived from Ni(NO3)2 · 6H2O. Based on this, the best CSCM (with the lowest free CaO content and the highest Ni load from nickel nitrate) was chosen to further study its industrial applicability by multicycle SESMR/sorbent-regeneration tests in a bench-scale packed-bed rig and attrition tests according to ASTM D5757-11. The CSCM was stable and active for 200 cycles with regenerations in N2 at 850°C, while a progressive loss of its activity occurred with regenerations in CO2 at 925°C as the cycle number increased due to Ni sintering. Its performance in the attrition tests was comparable to that of calcined dolomite.
|Titolo:||Sorption enhanced steam methane reforming by Ni/CaO/mayenite combined systems: Overview of experimental results from European research project ASCENT|
|Data di pubblicazione:||2020|
|Appare nelle tipologie:||1.1 Articolo in rivista|