Auto-thermal reforming (ATR) of acetic
acid (HAc) from renewable
bio-oil is an alternative route for hydrogen production, and a series
of Ni/Mn(II)Al(III)O
x±δ catalysts
were prepared via co-precipitation method and tested in the ATR of
HAc. Different parameters including reaction temperatures, O/C molar
ratios, gas-hourly space velocity (GHSV), and stability were investigated.
The optimal Ni0.39Mn1.61AlO4.31±δ catalyst exhibited excellent catalytic performance in a 50 h ATR
test: HAc was converted to H2-rich gas with conversion
near 100% and hydrogen yield at 2.7 mol H2/mol HAc. Characterization
results demonstrate that with strong interaction among nickel, manganese,
and aluminum, a thermally stable spinel structure of MnAl2O4 over the MnO support was formed and restrained the
growth of Ni particle; meanwhile, oxygen vacancies were found and
were beneficial for oxygen transfer in the gasification of carbon.
As a result, deactivation by carbon deposition and sintering was restrained.
Moreover, high GHSV up to 120,000 mL/(gcat.·h) and
fast response to startup were recorded, showing potential for hydrogen
feeding via the ATR process.
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