4 research outputs found
Mini-review on fibrous zeolite catalysts for CO2 reforming of methane
No full textThe persistent threat of climate change is brought on by extreme emissions of greenhouse gases (GHGs). Due to its advantages in converting two principal GHGs (CH4 and CO2) into a synthesis gas (H2 and CO), carbon dioxide reforming of methane has received a lot of interest. However, the main issue with a dry reforming of methane (DRM) that needs to be rapidly tackled is catalyst deactivation caused by sintering and coke formation. In this context, the development of fibrous morphological support materials has emerged as an exciting technique that has shown promise in enhancing the physicochemical characteristics of the catalyst and enabling superior catalytic activity and deactivation resistance during the reaction. The physicochemical characteristics of fibrous zeolite-supported type catalysts, including metal-support interaction, metal dispersion, particle size, surface area, and porous nature, were the main emphasis of this mini-review. Designing suitable catalysts for DRM requires a thorough examination of catalytic properties and their relationship to catalytic performance
Mini-review on CO2 reforming methane in aspect of fibrous zeolite's properties
No full textThe threat of climate change resulting from the excessive emission of greenhouse gases remains intractable. CO2 reforming of methane (DRM) has attracted considerable attention owing to its advantages in converting two primary greenhouse gases (CH4 and CO2) into synthesis gas (H2 and CO). However, catalyst deactivation arose from sintering and carbon formation is the primary problems for DRM that must be urgently solved. In this regard, creating support materials with fibrous morphology and dendrimeric structures is becoming an intriguing approach demonstrating its advantages in improving catalyst's physicochemical properties thus promote an excellent catalytic activity, stability, and deactivation resistance during reaction. This mini-review focuses on the physicochemical features of fibrous zeolite-supported type catalysts and their significance in DRM catalytic performance, including the interaction between metal and support, metal dispersion, particle size, porosity, and surface area. This study also provide the understanding of catalytic properties and their correlation with catalytic performance needed for the design of catalysts and suitable for DRM
Catalytic conversion of greenhouse gases (CO2 and CH4) to syngas over Ni-based catalyst : Effects of Ce-La promoters
No full textDry reforming of methane (DRM) is an emerging technology as it can simultaneously serve as a prospective alternative energy source and mitigate greenhouse gases (e.g. CH4 and CO2). However, the industrial applications of DRM remain restricted due to the poor prospect of catalyst deactivation. In this study, the effects of adding CeO2 and La2O3 as promoters on the catalytic performance of Ni/Al2O3 catalyst were assessed. Catalysts such as Ni/Al2O3, Ni/Al2O3-La2O3, and Ni/Al2O3-CeO2 were synthesized at nano level using the sol-gel method. Citric acid was added to improve the reactivity of catalysts before the application of DRM. Various characterisation techniques were used to characterise synthesized catalysts, including Brunauer-Emmett-Teller (BET) analysis, temperature-programmed reduction (TPR), field emission scanning microscopy (FESEM), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The results revealed that the BET surface area of the synthesized catalyst slightly decreased when CeO2 and La2O3 were added due to the deposition on the porous structure of the support. Meanwhile, the XRD results demonstrated the increase in reducibility and dispersion of Ni using CeO2 promoter and the inhibited development of the non-active phase of Ni/Al2O3 using La2O3 promoter (i.e. NiAl2O4), resulting in the carbon formation and reduced efficiency of the catalyst. The catalytic performance in DRM at 800 °C showed that Ni/Al2O3-CeO2 catalyst exhibited higher catalytic performance in terms of CH4 and CO2 conversion with 89.6% and 91.2% respectively. While Ni/Al2O3-La2O3 was found to play a substantial role in the stability of the chemical reaction during the 8 h reaction time-on-stream. © 2020 The Author(s
Properties-activity correlation of Nickel supported on fibrous Zeolite-Y for dry reforming of methane
No full textNickel-supported Fibrous zeolite-Y (Ni/FHY) was successfully synthesized via the microemulsion method using HY as seed, followed by catalytic evaluation in dry reforming of methane (DRM) for hydrogen production. Ni/FHY possessed good NiO distribution, improved metal-support interface, and strong basicity, accredited to the fibrous structure of FHY. This unique morphology led to the enrichment in the amount of accessible Ni active sites, thus resulting in the superior activity of Ni/FHY (XCH=95.1%,XCO=91.1%,H2/CO=0.89) compared to Ni/HY (XCH=92.7%,XCO=89.8%,H2/CO=0.78). Meanwhile, the inferior performance of Ni/HY could be caused by the poor distribution of Ni with large particles, thus contributing to high carbon deposition and Ni sintering. The unique physicochemical properties and superior catalytic activity confirmed its viability in the DRM
