Development of Ni-Rh-Al catalysts for methane dry reforming: Influence of the method of preparation

MARÍA MARGARITA MONTENEGRO; CASTRO LUNA ADOLFO; BACHILLER ALICIA; IRIARTE MARÍA ELENA; ARDISSONE DANIEL ENRIQUE

Current Topics in Catalysis. Research Trends

Research Trends

Lugar: Kerela; Año: 2016 vol. 12 p. 53 - 60

0972-4508

The influence of the preparation method of the nickel-rhodium-aluminum based catalyst on its microstructure and catalytic activity for methane carbon dioxide reforming was studied. Aluminum sec-butoxide, Ni 1-metoxi 2-propoxide and rhodium nitrate were used as starting reactants. Three catalysts were prepared by the main methods: i) hydrolysis and thermal decomposition (TD), ii) hydrolysis and acid peptization (sol-gel, SG) and iii) hydrolysis, thermal decomposition and hydrothermal treatment (TD-HT). The three catalysts were evaluated for a period of 30 hours with the same metallic composition, 14% Ni, 1.4% Rh and the same operating conditions namely temperature, 790 ºC; W/FºCH4,in (relationship between mass of catalyst and the flow of methane in the feed stream), 0.5 g.h.mol-1 and CO2:CH4 ratio 1.0. The best bulk catalyst identified was (Ni-Rh-Al)TD-HT, showing excellent activity, selectivity, and stability. On the other hand the catalyst (Ni-Rh-Al)TD-HT was analyzed in a fixed bed reactor, modifying initial conditions such as temperature, W/FºCH4,in and CO2:CH4 ratio for a period of 120 hours achieving excellent catalytic activity, selectivity and stability. Studies on all catalysts evaluated reveal a low filamentous-type carbon deposition.Buy this Article