Production of clean hydrogen from methane decomposition over molten NiO‐LiOH catalyst systems supported on CaO: Synergistic effect of molten LiOH on catalyst activity

Abstract

Mature hydrogen producing technologies like steam methane reforming, coal combustion, and hydrogenation of hydrocarbons are leading emitters of greenhouse gases into the atmosphere. Catalytic decomposition of methane into carbon and hydrogen is a sure way of controlling the net emission of this greenhouse gas into the atmosphere. In this study, we present an environmentally benign approach of producing hydrogen from methane over a supported molten metal oxide catalyst. Catalyst systems were prepared by incipient wetness impregnation and characterized for crystallinity, shape and size, and surface area using various techniques. Methane conversion experiments were done in a packed bed reactor over three different catalyst systems synthesized from nickel oxide, lithium hydroxide, and calcium oxide (CaO) under various process conditions. Gaseous products from the reactor were analyzed using gas chromatography. Using catalyst 38N12L, 45.9% hydrogen yield was obtained at 650°C and GHSV of 1.2 Lg−1cath−1. The molten environment provided by LiOH enhanced hydrogen yields by 12.6% through surface reaction and chemisorption. Calcium oxide played a bifunctional role as a catalyst support and an adsorbent of in situ generated CO/CO2 gases thereby improving hydrogen quality.

CO2 pyrolysis and gasification of COVID‐19 based wastes (overall gown) with Indian high ash coal

“…XRD of the residue obtained from the gasification and OG ash is shown in Figure 9. It can be observed that the OG ash contains a high amount of CaO and CaCO 3 39,40 . The fuel mixture residue contains clay (montmorillonite, illite and kaolinite), quartz and haematite particles, which was also reported by Barma et al 41 The presence of CaCO 3 and CaO can be observed from XRD peaks of the co‐gasified residue at 32, 37.4 and 40.34°.…”

“…It can be observed that the OG ash contains a high amount of CaO and CaCO 3 . 39,40 The fuel mixture residue contains clay (montmorillonite, illite and kaolinite), quartz and haematite particles, which was also reported by Barma et al 41 The presence of CaCO 3 and CaO can be observed from XRD peaks of the co-gasified residue at 32, 37.4 and 40.34 . It can be seen from the XRD peaks that the intensity of CaO is significantly lesser than quartz/clay particles.…”

Microwave-Mediated Synthesis and Characterization of Ca(OH)2 Nanoparticles Destined for Geraniol Encapsulation

“…An X-ray diffractogram of the Ca(OH) 2 @OAm NPs is presented in Figure 1, revealing a hexagonal Ca(OH) 2 in the portlandite phase (JCPDS pdf card #72-0156) [26]. Prominent peaks in the diffraction pattern are evident at angles (2θ) of 18.2 • , 28.9 • , and 34.4 • , corresponding to (001), (100), and (011) reflections, respectively.…”