Methanol Steam Reforming Over NiAl and Ni (M) Al Layered Double Hydroxides (M = Au, Rh, Ir) Derived Catalysts

Abstract

This paper deals with an experimental investigation concerning steam reforming of methanol at 280, 340 and 380°C over NiAl and Ni (Au, Rh or Ir)Al layered double hydroxides (LDHs) derived catalysts. Incorporation of noble metal ions into the NiAl-LDH framework was evidenced by XRD, TGA and TEM techniques. High selectivity to H 2 and CO 2 with less than 5% (volume) CO and trace CH 4 was observed over the NiAl-LDH catalyst. Whereas CO and H 2 are major products at lower temperatures after addition of Au, Rh and Ir to the NiAl-LDH system. They are significantly reduced with the concomitant increase in CH 4 and CO 2 as the temperature increased.

Effect of hydrothermal treatment on properties of Ni–Al layered double hydroxides and related mixed oxides

“…After thermal decomposition at moderate temperatures, LDHs give finely dispersed mixed oxides of M II and M III metals with large surface area and good thermal stability. Calcined Ni-Al LDHs are used as catalysts of various reactions, for example in the steam reforming of methanol [4] or selective reduction of aldehydes to alcohols [5], and exhibit also a high activity in N 2 O decomposition [6]. Thermal decomposition of LDHs was studied by many authors, a great number of studies were performed namely with synthetic Mg-Al hydrotalcite [7][8][9].…”

K (Na)-promoted Ni, Al layered double hydroxide catalysts for the steam reforming of methanol

“…Ni/Al layered double hydroxides (LDH) derived catalysts also attracted some attentions [18,19], including our recent work [20][21][22]. It is well known that Ni-Al co-precipitated materials have been extensively studied in the production of H 2 from methane via reforming or partial oxidation [23][24][25].…”

“…higher selectivity for H 2 and CO 2 and lower selectivity for CO and CH 4 , under certain conditions [21,22]. The metallic Cu species were believed as active sites in Cu-based catalyst and the presence of layered structure was also considered necessary in terms of better selectivity for methanol steam reforming [28].…”

H2 Production via the Steam Reforming of Methanol Over NiAl-layered Double Hydroxide Derived Catalysts

“…NiAl-LDH precursors were prepared by co-precipitation method at constant pH of 7 and room temperature in air [29][30][31][32]. They were synthesized by drop-wise addition of aqueous potassium or sodium carbonate salt solution and another aqueous Ni 2?…”

“…In this review, recent progress on the catalytic performance of the NiAl-LDH-derived catalysts in the methanol steam reforming is reporting, including the influence of hybrid-atom addition [29], calcination temperature, reaction temperature, pre-treatment temperature [30] and atmospheres, steam to methanol ratios [31] and inorganic ions [32]. In some cases high selectivity to the reforming reaction with the acceptable conversion of methanol was attained.…”