Oxidative steam reforming of ethanol over Rh based catalysts in a micro-channel reactor

Renewable Hydrogen from Ethanol Reforming over CeO2-SiO2 Based Catalysts

“…At similar operative conditions (which means a similar ratio between feed and catalytic mass), other authors found a faster deposition of coke [28,64], even if stability tests were performed for lower TOS [65]: these results demonstrated the competitiveness of the Pt-Ni/CeO 2 -SiO 2 catalyst in terms of endurance performances. In order to evaluate catalyst stability under more stressful conditions, space velocity was increased from 4.1 to 123 h −1 and the effect of contact time on ethanol conversion was investigated.…”

“…The relationship between CFR and WHSV was also investigated, finding a non-linear dependence. Moreover, it is worthwhile noting that several authors [15,65,69], reporting OSR tests for WHSV in the range 40-70 h −1 , measured CFR as higher or comparable (1.3 × 10 −4 and 6.9 × 10 −5 g coke ·g c,fed −1 ·g cat −1 ·h −1 ) to the value recorded over the Pt-Ni/CeO 2 -SiO 2 catalyst at 123 h −1 . The influence of space velocity on CFR can be explained considering that the low contact time is responsible for a reduced extent of coke gasification reaction, per se already slower than the reactions in gaseous phase due to its heterogeneous nature [70].…”

Ethanol steam reforming over rhodium and cobalt-based catalysts: Effect of the support

“…(5)), indicating that hydrogen is also produced by water gas shift reaction, WGSR (Eq. (10)), which is also catalyzed by rhodium and cobalt [7,32]. This is confirmed by the higher values of carbon dioxide selectivity of the samples containing magnesium as compared to alumina-based catalysts.…”

“…A large amount of papers addressed to the production of hydrogen from ethanol involves the steam reforming process and catalysts based on noble metals, such as rhodium, platinum, iridium, palladium and ruthenium as well as non-noble metals, such as cobalt, nickel and copper [2e6]. Among noble metals, several studies showed that rhodium is the most active and selective one for the hydrogen production [7,8] while among the catalysts based on non-noble metals, those containing cobalt showed the highest activity and selectivity to hydrogen [9e12]. In fact, supported cobalt has shown similar activity to noble metals for the CeC bond cleavage, even around 400 C, producing hydrogen from ethanol steam reforming [8,9].…”

Advances in Ethanol Reforming for the Production of Hydrogen

“…The activity dropped after 40 h of reaction because of the separation of the layers of the catalyst from the stainless steel plate, sintering, or coke deposition. 58 In a similar study, 59 the stability of the catalyst in a channel microreactor at 500 °C was evaluated. In this case, the catalyst was stable for 35 h, after which the conversion decreased gradually (loss of 20% over 25 h).…”