Rh–Ni/CeO2–Al2O3 catalysts for methane dry reforming

Coprecipitation versus chemical vapour deposition to prepare Rh/Ni bimetallic catalysts

“…The addition of small amounts of noble metals, mainly Rh, to the catalyst formulation increased the Ni 2+ reducibility [3][4][5][6][7][8][9] and Ni 0 dispersion [10][11][12], retarded the sintering [9,13], avoided Ni 0 oxidation under steam or oxygen atmosphere [11,14,15], and decreased the activation energy for CH 4 dissociation in Rh/Ni alloys [16]. Consequently, enhanced activities were reported not only in conventional and commercial H 2 and syngas processes such as steam reforming [17,18], autothermal reforming [7,12,17,19,20] and oxyreforming [21][22][23][24], but also in more prone to carbon formation processes such as dry reforming [9,[25][26][27][28][29][30][31], ethanol reforming [32][33][34], biogas reforming [35] and, lastly, in fuel cell devices [17], in which large hydrocarbons were fed in systems operating under transient conditions [36,37]. Indeed, Rh promoted the gasification of adsorbed carbon by steam in the autothermal reforming of isooctane [38] and...…”

Mesoporous catalysts for dry reforming of methane: Correlation between structure and deactivation behaviour of Ni-containing catalysts

“…Another possibility is the reduction of Ni 2þ ions from non-stoichiometric NiAl x O y and stoichiometric NiAl 2 O 4 species. The third peak centred at 884 C could be attributed to ceria strongly interacting with alumina e.g., CeO 2 eAl 2 O 3 [24,25]. Also, the reduction of the latter species provides Ce 3þ surface, which form solid solutions as CeAlO 3 .…”

Influence of Catalytic Formulation and Operative Conditions on Coke Deposition over CeO2-SiO2 Based Catalysts for Ethanol Reforming

“…This result highlights the key role of the active component in promoting support reduction. Rh-containing samples displayed the lowest temperature for consumption peaks, due to the improved catalyst reducibility upon Rh addition [42]. Conversely, the support doping by alkali addition (especially in the case of potassium) was accompanied by a leftward shift peaks, which attested that catalyst basification may increase the metals-support interactions and retard oxide reduction [43].…”