Pt-Co and Pt-Ni catalysts of low metal content for H2 production by reforming of oxygenated hydrocarbons and comparison with reported Pt-based catalysts

LIZA DOSSO; CARLOS VERA; JAVIER GRAU

International Journal of Chemical Engineering

Hindawi Publishing Corporation

Lugar: Londres; Año: 2018 vol. 4972 p. 1 - 10

1687-8078

New catalysts of Pt, Pt-Ni, Pt-Co and Ni-Co supported on Al2O3 were developed for producing hydrogen by aqueous phase reforming (APR) of oxygenated hydrocarbons. In order to improve the metal-support interaction, decrease the metal load and increase the metal dispersion, the urea matrix combustion technique (UMC) was used for loading the metal on the support.The catalysts were characterized by MS/ICP, N2 adsorption, XRD, TPR, CO chemisorption and the test of cyclohexane dehydrogenation (CHD). The APR of a solution of 10% mass ethylene glycol (EG), performed in a tubular fixed bed reactor at 498 K, 22 bar, WHSV=2.3 h-1, was used as main reaction test. After 10 h on-stream the catalysts prepared by UMC had better hydrogen yield and catalytic stability than common catalysts prepared by IWI. The UMC/IWI H2 yield ratio was 23.5/15.2 for Pt, 24.0/17.0 for PtCo, 26.6/21.0 for PtNi and 8.0/3.9 for NiCo. Ni or Co addition to Pt increased the carbon conversion while keeping the H2 turnover high. Cobalt also improves stability. Reports of several authors were revised for a comparison. The analysis indicated that the developed catalysts are a viable and cheaper alternative for H2 production from a renewable resource.