Sorption enhanced steam methane reforming by Ni/CaO/mayenite combined systems: Overview of experimental results from European research project ASCENT

Abstract

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). This work summarizes the whole experimental study carried out in ASCENT WP4 on Ni/CaO/mayenite systems obtained from wet mixing and wet impregnation synthesis methods. 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 by means of characterizations and reforming reactivity tests in a packed‐bed microreactor (650°C, 1 atm). Thanks to comparative analyses of the results, 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.

Methane decomposition into CO x ‐free hydrogen over a Ni‐based catalyst: An overview

“…Based on the raw material, methods to produce hydrogen can be categorized as conventional (fossil fuel) or renewable. Some examples of conventional hydrogen production methods include steam methane reforming, 2‐15 partial oxidation reforming, 16‐18 and methane pyrolysis, including nonoxidative catalytic methane decomposition (CMD) 19‐23 . Examples of renewable hydrogen production methods include electrolysis 24‐27 and photocatalysis 28‐30 .…”

Formation of solid‐solution Co x Ni 1− x CO 3 as high‐performance anode materials for lithium‐ion batteries

“…And for the case of mono-metal Ni-based carbonate, just the metallic Ni with two crystalline phases can be obtained (Figure S2B), maybe due to the reduction of ethylene glycol for the Ni species. 41,42 In order to give an further understand on the structural/morphological features of the CNCO-20, (HR) TEM measurements were conducted. Representatively, the as-synthesized CNCO-20 can be clearly seen as nanospherical structure, which is assembled with a lamellar sub-unites (Figure 3A,B).…”

Modelling of one-dimensional heterogeneous catalytic steam methane reforming over various catalysts in an adiabatic packed bed reactor

“…A number of studies have been carried by several authors in the literature to describe the benefits of SER by using various feedstocks and sorbents along with the different flow configurations and innovative processes combining sorption enhanced and chemical looping [23][24][25][26][27][28][29][30][31][32][33][34][35][36].…”