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

Abstract

New catalysts of Pt, PtNi, PtCo, and NiCo supported on Al 2 O 3 were developed for producing hydrogen by aqueous phase reforming (APR) of oxygenated hydrocarbons. e urea matrix combustion technique was used for loading the metal on the support in order to improve several aspects: increase both the metal-support interaction and the metal dispersion and decrease the metal load. e catalysts were characterized by MS/ICP, N 2 adsorption, XRD, TPR, CO chemisorption, and the test of cyclohexane dehydrogenation (CHD). e 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 the 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. e UMC/IWI H 2 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 H 2 turnover high. Cobalt also improves stability. Reports of several authors were revised for a comparison. e analysis indicated that the developed catalysts are a viable and cheaper alternative for H 2 production from a renewable resource.

Electrocatalytic hydrogenation of cinnamaldehyde in a PEM cell: The role of sodium hydroxide and platinum loading

“…The first maximum would correspond to the reduction of platinum complex deposited on the surface of the carbonaceous support and not located near metal particles [39,40] whereas that at high temperature is attributable to the gasification of the carbonaceous support catalyzed by the Pt particles [41][42][43]. This second peak shifts to lower temperatures when platinum is present due to the platinum spillover effect [44]. It can be also observed that as the metal loading increases, and therefore the crystallite size, reduction profiles move to lower temperatures.…”