Effect of the Calcination Temperature of LaNiO3 on the Structural Properties and Reaction Performance of Catalysts in the Steam Reforming of Methane

Abstract

The steam reforming of methane (SRM) reaction is a significant process for efficient syngas generation and for promising distributed hydrogen production. In this work, a series of LaNiO3 oxides were prepared using the Pechini method, calcined from 600 °C to 900 °C and tested for the SRM reaction. Fresh, reduced, and used samples were characterized using STA-MS-FTIR, in situ and ex situ XRD, N2 physical adsorption, H2-TPR, TEM, TPO, and Raman. The results show that LaNiO3 begins to crystallize at about 550 °C, and the increase in calcination temperature results in the following differences in the properties of the LaNiO3 samples: larger LaNiO3 grains, smaller specific surface area, higher reduction temperature, smaller Ni0 grains reduced from the bulk phase, and stronger metal–support interaction. The maximum CH4 conversion could be achieved over LaNiO3 calcinated at 800 °C. In addition, the effect of steam-to-carbon ratio (S/C) on the performance of the SRM reaction was studied, and a S/C of 1.5 was found to be optimal for CH4 conversion. Too strong a metal–support interaction and too much unreacted steam causes a loss of catalytic activity. Finally, it was also proved using TPO and Raman that an increase in calcination temperature improves the carbon deposition resistance of the catalyst.

Perovskite-Derivative Ni-Based Catalysts for Hydrogen Production via Steam Reforming of Long-Chain Hydrocarbon Fuel

“…The reduction peaks belong to the reduction of surface oxygen, LaNiO 3 to LaNiO 2.5 , and LaNiO 2.5 to Ni metal, respectively [43,44]. The shoulder peak between 300 and 350 • C belongs to the reduction of surface oxygen, as confirmed by previous work [39]. The peak intensity increases with rare earth-element doping, suggesting increased surface oxygen vacancy.…”

“…Owing to the extremely important role of the support in the catalyst system, it can not only promote the dispersion of active components, but also suppress the sintering of active metals when there is a strong interaction between the support and metal. Among them, perovskite (ABO 3 ) supports are a widely used type of support [37][38][39]. Its A and B sites can be finely regulated and substituted, and it has very high sintering resistance, showing good application prospects in many fields [40].…”

Photocatalytic Water Splitting for H2 Production via Two‐electron Pathway

“…Because solar energy drives pure water splitting directly, the ability of light absorption for photocatalysts is a key factor to achieve high H 2 evolution. Although the wavelength range of sun irradiation is extensive, visible light from 400 to 700 nm contains the most intense solar radiation, which possesses about 43 % of the solar energy on the surface of earth [35] . If photocatalysts can utilize all ultraviolet (UV) light up to 400 nm, the solar‐to‐hydrogen conversion efficiency (STH) would be restricted to 2 % [36] .…”

“…Due to the inevitable disadvantages of energy and environmental crisis, the search for renewable energy sources has become one of the major technological challenges in the 21st century. As a renewable energy source, solar energy has abundant reserves and huge potential in the world [3] . According to relevant studies, the amount of solar energy reaching the surface of earth is between 0.06 kW/m 2 and 0.25 kW/m 2 .…”

A Mini-Review on Lanthanum–Nickel-Based Perovskite-Derived Catalysts for Hydrogen Production via the Dry Reforming of Methane (DRM)

“…The determination of mechanisms for LaNiO 3 perovskites used in the DRM has recently gained added impetus via in situ microscopy and spectroscopy studies that can provide evidence for activity-structure correlations. Thus, these techniques can contribute inter alia to a more comprehensive understanding of how oxygen defects influence catalytic behavior during DRM and illuminate their significance as active sites, as well as elucidate their influence on catalytic performance [162][163][164].…”