Effect of Coal Ash on the Steam Reforming of Simulated Bio-oil for Hydrogen Production over Ni/γ-Al2O3

Abstract

An improved system for hydrogen production by the steam reforming of simulated bio-oil was developed. The coal ash was packed in front of nickel-based catalysts, acting as a guard catalyst. The model compounds passed through coal ash and were preliminarily reformed to smaller molecular intermediates containing more CO and CH4, which were then further reformed over the following nickel-reforming catalyst. The improved reaction system succeeded in effectively converting the complex simulated bio-oil into hydrogen and exhibited high activity. For 15 wt.% Ni/γ-Al2O3 catalyst with coal ash packing, the catalyst lifetime was extended to 8 h, with simulated bio-oil almost completely converted into hydrogen. In addition, coke deposition was suppressed.

Catalytic Steam Reforming of Bio-Oil-Derived Acetic Acid over CeO2-ZnO Supported Ni Nanoparticle Catalysts

“…Adding a certain amount of Ce can significantly enhance the performance of Ni/CeO 2 -ZnO, which is attributed to the reaction 2CeO 2 → Ce 2 O 3 + 1/2O 2 . CeO 2 that has a strong redox capacity and can be reused while continuously removing carbon deposition. − On the one hand, the generated oxygen can oxidize C to remove carbon deposition; on the other hand, low-cost Ce 3+ is easily oxidized by O 2 and H 2 O into high-value Ce, which achieves the purpose of storing oxygen. Therefore, adding Ce is beneficial for improving the stability of the catalyst.…”

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

“…Reactions were carried out in a stainless tube, atmospheric pressure reactor between 400 ºC and 600 °C, H2O/FUR = 7-84 (mol/mol), S/C = 1-17 and GHSV of 2300 h-1. The range of S/C chosen to carry out the studies is justified considering the amount of water present in the non-useful aqueous phase obtained during the fast pyrolysis process [10,15,[54][55][56][57]. The reactor was charged with 0.5 g of catalyst and SiC as diluent.…”

“…The bio-oil obtained in fast pyrolysis can be separated into two phases, an oil fraction suitable to produce hydrocarbons or products with high added value and a non-useful aqueous phase containing a complex mixture of organic compounds where furfural can be considered one of the most representative compounds. Currently, several studies focused on the development of catalysts for the steam reforming of the oil phase to produce hydrogen can be found [8][9][10]. However, the catalytic reforming of the aqueous phase has not been properly considered yet.…”