The inclusion of Mg[H.sub.2] into iron oxide and nickel oxide modified mesoporous carbon sorbent: an investigation on hydrogen production/Inkluzija Mg[H.sub.2] u mezoporozni grafitni sorbent modifikovan gvozde-oksidom i nikal-oksidom: ispitivanje proizvodnje vodonika

In the present work, we investigated the hydrogen desorption properties of nano-sized Mg[H.sub.2] that was loaded on ordered mesoporous carbon (OMC) surface that had been already modified with nickel and iron oxide nanoparticles. The surface modified mesoporous carbon was characterized by BET surface area and X-ray diffraction (XRD) analysis. The amount of Mg[H.sub.2] on the carbon surface was confirmed by thermogravimetric analysis (TGA). Dehydrogenation data of Mg[H.sub.2] on the ordered mesoporous carbon were collected for the pressure up to 8 MPa (80 bar) at 500 K. The incorporated Mg[H.sub.2] on nickel oxide-mesoporous carbon nanocomposite had faster dehydrogenation kinetics compared to incurporated Mg[H.sub.2] on iron oxide-mesoporous carbon nanocomposite as well as incorporated Mg[H.sub.2] on mesoporous carbon. This can be attributed to the particle size of the former being smaller than that of the latter, as well as much accessible nanosized surface of loaded Mg[H.sub.2]. Keywords: mesoporous carbon, hydrogen desorption, Mg[H.sub.2], nanocomposite, iron oxide nanoparticle, nickel oxide nanoparticle. Available online at the Journal website: U ovom radu, ispitivanano je desorpciono ponasanje nanostrukturnog Mg[H.sub.2] koji je formiran na uredenoj povrsini mezoporoznog ugljenika (OMC), koja je prethodno modifikovana sa cesticama oksida gvozda i nikla. Karakterizacija modifikovane povrsine mezoporoznog ugljenika je radena BET i rendgenskom strukturnom (XRD) analizom. Kolicina Mg[H.sub.2] na povrsini ugljenika je potvrdena termogravimetrijskom analizom (TGA). Podaci o dehidrogenaciji Mg[H.sub.2] sa uredenog mezoporoznog ugljenika su dobijeni za pritisak od 8 MPa i temperaturu od 500 K. Utvrdeno je da je kinetika dehidrogenacije brza sa povrsine modifikovane nikal-oksidom u odnosu na onu modifikovanu gvozde-oksidom. Ovi eksperimentalni rezultati se mogu objasniti cinjenicom da je velicina cestica nanokompozita nikal-oksid/mezoporozni ugljenik manja nego nanokompozita dobijenog sa gvozde-oksidom, kao i vecom dostupnoscu nanostrukturne povrsine inkorporiranog Mg[H.sub.2]. Kljucne reci: Mezoporozni ugljenik * Desorpcija vodonika * Mg[H.sub.2] * Nanokompozit * Nanacestica gvozde-oksida * Nanaocestica nikal-oksida