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        Application of carbon nanotube coated aluminosilicate beads as “support on support” catalyst for hydrogenation of nitrobenzene

        László Vanyorek,Ádám Prekob,EmÅke Sikora,Edina Reizer,Gábor Muránszky,Ferenc Kristály,Béla Viskolcz,Béla Fiser 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-

        Nitrogen-doped bamboo-like carbon nanotube (N-BCNT) coating was synthesized onto the surface ofzeolite beads by using Catalytic Chemical Vapour Deposition (CCVD) method to develop a “support onsupport” (SoS) system. These complex structured materials were used as supports during the preparationof hydrogenation catalysts. Rhodium, palladium and platinum nanoparticles were depositedhomogeneously onto the surface of the N-BCNTs of the SoS (final metal content 2 wt%). The catalyticactivity of these samples was compared in the hydrogenation of nitrobenzene. The Pt/N-BCNT-zeolitesample was the most active (182 mol nitrobenzene after 30 min). The activity of the other two catalysts at20 bar was well below this value, 99.5 mol after 60 min and 96 mol after 120 min for Pd and Rh,respectively. The aniline selectivity was different for the three catalysts and they facilitate the formationof various by-products (e.g. N-methylaniline, cyclohexylamine). The usage of the Pd and Pt/NBCNT-zeolite catalysts are more convenient, as only one main by-product was formed. It was confirmedthat the zeolite supported N-BCNTs are efficient catalyst supports in hydrogenation processes. Furthermore, by using this special SoS structure to support the catalytic metals the applicability iswidened and the catalyst removal is easier.

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