Novel Ni–Mg–Al–Ca catalyst for enhanced hydrogen production for the pyrolysis–gasification of a biomass/plastic mixture

Abstract

Abstract:A Ni-Mg-Al-Ca catalyst was prepared by a co-precipitation method for hydrogen production from polymeric materials. The prepared catalyst was designed for both the steam cracking of hydrocarbons and for the in situ absorption of CO 2 via enhancement of the water-gas shift reaction. The influence of Ca content in the catalyst and catalyst calcination temperature in relation to the pyrolysis-gasification of a wood sawdust /polypropylene mixture was investigated.The highest hydrogen yield of 39.6 mol H 2 /g Ni with H 2 /CO ratio of 1.90 was obtained in the presence of the Ca containing catalyst of molar ratio Ni:Mg:Al:Ca = 1:1:1:4, calcined at 500 °C.In addition, thermogravimetric and morphology analyses of the reacted catalysts revealed that Ca introduction into the Ni-Mg-Al catalyst prevented the deposition of filamentous carbon on the catalyst surface. Furthermore, all metals were well dispersed in the catalyst after the pyrolysisgasification process with 20-30 nm of NiO sized particles observed after the gasification without significant aggregation.

Development of Heterogeneous Catalysts for Thermo-Chemical Conversion of Lignocellulosic Biomass

“…Kumagai et al [75] used the Ni-Mg-Al-Ca system for the thermal conversion of wood sawdust mixed with polypropylene in a two-stage stainless tube reactor. The obtained results showed that the presence of the catalyst led to an increase in hydrogen content, highest for the material with the Ni:Mg:Al:Ca molar ratio 1:1:1:4.…”

Sustainable application of magnesium alloy through Electrodeposition of Hydroxyapatite Coating

“…2 , HAp. Alkaline treatment (acid-base reaction) converts brushite and β-TCP film formed on the Mg-alloy surface by electrodeposition into hydroxyapatite, HAp.These results clearly show that electrodeposited coating prior to alkaline treatment is mainly consisted of calcium phosphate dihydrate and β-TCP.…”

Steam gasification of printed circuit board from e-waste: Effect of coexisting nickel to hydrogen production

“…Supported nickel metal has been widely used and it is considered as a feasible catalytic option for steam gasification of light hydrocarbons [41], biomass [39,42,43], plastics [44,45] and mixtures of biomass and plastics [46] due to the high cost of the noble metals. Some authors [41] studied the interactions of supported nickel and nickel oxide catalysts in the steam gasification of methane and reported that hydrocarbon fuels are partially or fully oxidized to produce hydrogen, carbon monoxide, carbon dioxide and water.…”