Thermal dry reforming of methane over La2O3 co-supported Ni/MgAl2O4 catalyst for hydrogen-rich syngas production

Abstract

The excess emission of greenhouse gases (GHGs) such as CO 2 and CH 4 is posing an acute threat to the environment, and efficient ways are being sought to utilize GHGs to produce syngas (H 2 , CO) and lighter hydrocarbons (HCs). In this study, the dry reforming of methane (DRM) has been carried out at 700 °C using La 2 O 3 co-supported Ni/MgAl 2 O 4 nano-catalyst in a fixed bed thermal reactor. The catalyst is characterized using various techniques such as XRD, FESEM, EDX-mapping, CO 2 -TPD, H 2 -TPR and TGA. The modified MgAl 2 O 4 shows the flake type structure after the addition of La 2 O 3 . The TPR and TPD analysis shows the highly dispersed metal and strong basic nature of the catalyst consequently enhances the conversion of CO 2 and CH 4 . The highest conversion for CH 4 is 87.3% while CO 2 conversion is nearly 89.5% in 20 h of operation time. The selectivity of H 2 and CO approached 50% making the H 2 /CO ratio above unity. In the longer time-on-stream (TOS) test, the catalyst shows elevated potential for longer runs showcasing better catalytic activity. The stability of the catalyst is indicated via a proposed reaction mechanism for DRM in operating conditions. Moreover, TGA indicates the lower weight loss of spent catalyst which ascribed the lower formation of carbon during TOS 20 h.

3D porous flower-like CoAl2O4 to boost the photocatalytic CO2 reduction reaction

“…58 Meanwhile, the CO 2 molecules adsorbed on weakly basic and moderately basic sites are converted to species such as active carbonates and further reduced to CH 4 . 59 The peak areas of the weakly basic and moderate sites for CoAl-750 are greater than those of other CoAl catalysts, illustrating that the CO 2 adsorption capacity of CoAl-750 is better than that of other catalysts, demonstrating that CoAl-750 has more abundant active sites, 60,61 which is one of the reasons why the photocatalytic capacity of CoAl-750 is better than that of other catalysts.…”

Role of Fe Species of Ni-Based Catalysts for Efficient Low-Temperature Ethanol Steam Reforming

“…According to the previous research, the reduction of pure NiO to metallic Ni generally occurred at 400 °C or lower temperature . However, when the nickel species are in a highly dispersed state or in strong interaction with the supports, the reduction temperature will increase significantly compared with that of pure NiO. − As for the prepared Ni10/MgAl 2 O 4 catalyst, a broad peak attributed to the reduction of NiO is observed at around 630 °C, which is much higher than the reduction temperature of pure NiO. It proves that nickel species exhibit a good dispersion state and strong interaction with MgAl 2 O 4 support, which is consistent with the previous research results. , When Fe was introduced, the main reduction peak is found to shift to a lower temperature at around 570 °C, indicating that the introduction of Fe can greatly promote the reduction of nickel.…”

Synthesis of Ash Derived Co/Zeolite Catalyst for Hydrogen Rich Syngas Production via Partial Oxidation of Methane

“…The main component of natural gas is CH4 which itself is a GHG but can be used in green energy applications which have been a focus of researchers owing to their high efficiency and low emissions [13][14][15][16]. The CH4 is usually converted to syngas using steam methane reforming [17], dry reforming [18][19][20], and partial oxidation of methane (POM) [4, [21][22][23]. Both the reforming processes are very endothermic, i.e.…”