Hydrogen production by aqueous-phase reforming of ethylene glycol over a Ni/Zn/Al derived hydrotalcite catalyst

Abstract

HT) with different Ni/Zn ratios have been prepared by a coprecipitation method. The properties and microstructure of Ni/Zn/Al-HT precursors and derived catalysts were characterized by X-ray diffraction (XRD), H 2 -temperature programmed reduction (TPR), N 2 physical adsorption analysis (BET), scanning electron microscopy (SEM) and particle size distribution. The results exhibited that the as-prepared samples consisted of a hydrotalcite phase and a ZnO phase, and Zn 2+ was introduced into the layers. At the ratio of Ni/Zn ¼ 1, the ZnAl 2 O 4 phase emerged after calcination; Ni still remained in its original state after reaction, and ZnO always existed during the whole process. In aqueous-phase reforming (APR) of ethylene glycol, the H 2 production rate over Ni/Zn/Al-HT was high, and the selectivity of H 2 can almost reach 100% with a high conversion rate exceeding 99%.

A review of catalytic aqueous-phase reforming of oxygenated hydrocarbons derived from biorefinery water fractions

“…However, formation of acetol increased due to higher acidity of the catalyst [111]. NieSn and NieZn catalysts supported on hydrotalcite-like compounds were also applied in APR of ethylene glycol [37,76]. Ni/Sn/Al-HT and Ni/Zn/Al-HT showed high H 2 production rate and selectivity, as well as constant catalytic stability.…”

Review of Hydrogen Production by Catalytic Aqueous‐Phase Reforming

“…In a recent study, it was shown that the deactivation of Ni/CNF could be inhibited by adding potassium hydroxide to the feed. In two different works, it was established that NiZn and NiSn catalysts derived from hydrotalcite‐like materials were especially promising for producing H 2 ,. When APR of ethylene glycol was combined with the carbonation of KOH, it was possible to produce CO X ‐free H 2 using non‐pyrophoric Ni .…”

Hydrogen Production from Ethylene Glycol Aqueous Phase Reforming over Ni–Al Layered Hydrotalcite-Derived Catalysts

“…After that, nitrogen was introduced into the autoclave, and the autoclave was flushed three times to remove the residue air. Then, the reaction was carried out at 225 • C under nitrogen pressure of 2.6 MPa for 2.5 h [47]. After reaction, the gas phases were collected using a gas collecting bag and detected using gas chromatography (Beifen GC-3420A, China) equipped with a Porapak Q column of 3 m and a 5A molecular sieve.…”

“…The conversion of ethylene glycol and selectivity of H 2 and alkane were calculated according to the following equation [47].…”