Investigation on Co–Modified Ni_xMg_yO Solid Solutions for Hydrogen Production from Steam Reforming of Acetic Acid and a Model Blend

Abstract

This paper is focused on the Co‐modified NixMgyO solid solutions (10 wt% Ni, 2–6 wt% Co) for the steam reforming of acetic acid and a model blend. The pristine rocksalt structured NixMgyO solid solution and the modified NixMgyO−Co catalysts were synthesized via hydrothermal method and co‐impregnation. The activity of the catalysts was evaluated in the temperature range of 500–800 °C with a steam/carbon molar ratio of 3 and a gas hourly space velocity (GHSV) of 57,000 h−1. Low cobalt content (Co loading= 2 wt%) catalysts exhibited significant promotion of H2 yield via enhancement of both water‐gas shift (WGS) reaction and methane decomposition. A 30‐hour test at 700 °C achieved excellent acetic acid conversion rate and H2 yield of 99.1% and 86.9%, respectively. However, the catalysts with higher cobalt loading (Co loading≥ 4 wt%) suffered a much quicker deactivation mainly due to carbon deposition. In addition, the catalysts were also tested on a model blend combined acids, alcohols and aromatic species and exhibited outstanding performance with carbon conversion above 90% and H2 yield above 70% for 100 h.

Effect of the incorporation of reducibility promoters (Cu, Ce, Ag) in Co/ CaSBA ‐15 catalysts for acetic acid steam reforming

“…Mizuno et al 73 used Co‐Ni/MgAl 2 O 4 catalysts with S / C = 4 at 500°C achieving complete conversion but hydrogen selectivities around 62%. Luo et al 74 evaluate the influence of Co concentration (2‐6 wt%) over Ni x Mg y O catalyst, they led to the conclusion that in the acetic acid steam reforming at 600°C, S / C = 3, the best catalytic performance was achieved with 4 wt% of Co obtaining 79.4% of conversion with a hydrogen yield of 71%. Concerning Ni‐based catalysts, Hu et al 75 reported that 30Ni/Al 2 O 3 in the steam reforming of acetic acid with S / C = 3 at 400°C resulted in 70.9% of conversion with a hydrogen yield of 61.6%.…”

Addition of tungsten in Co/Al2O3 to catalyse the production of hydrogen through acetic acid steam reforming

“…[6] Currently, the main H 2 production methods are coal gasification, natural gas reforming, naphtha reforming, biomass utilization and water electrolysis. [7][8][9][10][11][12] H 2 production from fossil fuels is unsustainable and its production by water electrolysis is also suffered by high-cost and large energy consuming. However H 2 production from biomass can overcome these problems.…”