The effects of Pt promotion on the oxi-reduction properties of alumina supported nickel catalysts for oxidative steam-reforming of methane: Temperature-resolved XAFS analysis

Parizotto, N.V.; Zanchet, Daniela; Rocha, K.O.; Marques, C.M.P.; Bueno, J.M.C.

doi:10.1016/j.apcata.2009.06.039

Cited by 35 publications

(13 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Tellingly, while the fresh Ni-Fe catalyst shows a Ni-CO band at 2179 cm −1 , this band is absent from the corresponding spectrum post-regeneration. This suggests that the most coordinatively unsaturated Ni sites-which are the most active cracking sites [44]-are irreversibly deactivated during reaction/regeneration. Similarly, while the fresh Ni-Pt catalyst shows a well-defined peak at~2180 cm −1 and a broad feature at~2120 cm −1 associated with CO on metallic Ni sites, as well as a large and well-defined peak at~2077 cm −1 assigned to CO on Pt sites [13], none of these signals are observed post-regeneration.…”

Section: Structural and Activity Changes Observed During Catalysts Agmentioning

confidence: 99%

Promotional Effect of Cu, Fe and Pt on the Performance of Ni/Al2O3 in the Deoxygenation of Used Cooking Oil to Fuel-Like Hydrocarbons

et al. 2020

View full text Add to dashboard Cite

Inexpensive Ni-based catalysts can afford comparable performance to costly precious metal formulations in the conversion of fat, oil, or greases (FOG) to fuel-like hydrocarbons via decarboxylation/decarbonylation (deCOx). While the addition of certain metals has been observed to promote Ni-based deCOx catalysts, the steady-state performance of bimetallic formulations must be ascertained using industrially relevant feeds and reaction conditions in order to make meaningful comparisons. In the present work, used cooking oil (UCO) was upgraded to renewable diesel via deCOx over Ni/Al2O3 promoted with Cu, Fe, or Pt in a fixed-bed reactor at 375 °C using a weight hourly space velocity (WHSV) of 1 h−1. Although all catalysts fully deoxygenated the feed to hydrocarbons throughout the entire 76 h duration of these experiments, the cracking activity (and the evolution thereof) was distinct for each formulation. Indeed, that of the Ni-Cu catalyst was low and relatively stable, that of the Ni-Fe formulation was initially high but progressively dropped to become negligible, and that of the Ni-Pt catalyst started as moderate, varied considerably, and finished high. Analysis of the spent catalysts suggests that the evolution of the cracking activity can be mainly ascribed to changes in the composition of the metal particles.

show abstract

Section: Structural and Activity Changes Observed During Catalysts Agmentioning

confidence: 99%

Promotional Effect of Cu, Fe and Pt on the Performance of Ni/Al2O3 in the Deoxygenation of Used Cooking Oil to Fuel-Like Hydrocarbons

et al. 2020

View full text Add to dashboard Cite

show abstract

“…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].…”

Section: Introductionmentioning

confidence: 99%

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

Benito

Santo

Grandi

et al. 2015

Applied Catalysis B: Environmental

View full text Add to dashboard Cite

“…The addition of Pt promotes the formation of NiO and suppresses the generation of NiAl 2 O 4 . Parizotto et al [38] studied the effect of Pt promotion on the oxidation-reduction properties of alumina supported Ni catalysts for oxidative steam-reforming of methane by means of temperature-resolved X-ray absorption near edge structure (XANES) spectroscopy under various atmospheres. Compared to the monometallic Ni catalyst, the PtNi catalyst shows improved activity with enhanced coke resistance performance.…”

Section: Promotersmentioning

confidence: 99%

“…They detected an enhanced interaction between Pt and Ni, but no alloy formation was mentioned. Parizotto et al [38] studied the effect of Pt promotion on the oxidation-reduction properties of alumina supported Ni catalysts for oxidative steam-reforming of methane by means of temperature-resolved X-ray absorption near edge structure (XANES) spectroscopy under various atmospheres. They found that the presence of Pt sites induces the activation of methane, probably by initial dissociation of methane (CH 4 !CH 3 +H).…”

Section: Noble Metalsmentioning

confidence: 99%

Progresses in the Preparation of Coke Resistant Ni‐based Catalyst for Steam and CO₂ Reforming of Methane

et al. 2011

View full text Add to dashboard Cite

Steam reforming of methane is an extremely important process for the hydrogen and syngas production. Nickel‐based catalysts have been extensively employed in the industrial process of steam reforming because of their high activity, low cost, and the plentiful supply of Nickel. Nickel‐based catalysts have also shown high activity for CO2 reforming of methane, which has been considered as a good option, with consumption of a significant amount of carbon dioxide. However, a major challenge is that Ni catalysts have a high thermodynamic potential for coke formation during reforming reactions. For steam reforming, coke formation induces deactivation of the catalyst, especially if the carbon forms as carbon filaments. The filamentous carbon material has a high mechanical strength and can cause mechanical deformation of the catalyst. For CO2 reforming, coke formation over Ni catalyst is even more serious and leads to rapid deactivation of the catalyst. It is highly desired to design and synthesize a coke resistant Ni catalyst not only for reforming of methane, but also for reforming of other hydrocarbons (including biomass derived hydrocarbons). Herein we summarize the very recent progresses in the design, synthesis, and characterization of coke resistant Ni catalysts for steam and CO2 reforming of methane. The progresses in the use of promoters, in the effect of supporting materials and in the preparation methods have been discussed. The thermal stability, regeneration, and future development of coke resistant Ni catalysts for these processes are also briefly addressed.

show abstract

The effects of Pt promotion on the oxi-reduction properties of alumina supported nickel catalysts for oxidative steam-reforming of methane: Temperature-resolved XAFS analysis

Cited by 35 publications

References 29 publications

Promotional Effect of Cu, Fe and Pt on the Performance of Ni/Al2O3 in the Deoxygenation of Used Cooking Oil to Fuel-Like Hydrocarbons

Promotional Effect of Cu, Fe and Pt on the Performance of Ni/Al2O3 in the Deoxygenation of Used Cooking Oil to Fuel-Like Hydrocarbons

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

Progresses in the Preparation of Coke Resistant Ni‐based Catalyst for Steam and CO₂ Reforming of Methane

Contact Info

Product

Resources

About

The effects of Pt promotion on the oxi-reduction properties of alumina supported nickel catalysts for oxidative steam-reforming of methane: Temperature-resolved XAFS analysis

Cited by 35 publications

References 29 publications

Promotional Effect of Cu, Fe and Pt on the Performance of Ni/Al2O3 in the Deoxygenation of Used Cooking Oil to Fuel-Like Hydrocarbons

Promotional Effect of Cu, Fe and Pt on the Performance of Ni/Al2O3 in the Deoxygenation of Used Cooking Oil to Fuel-Like Hydrocarbons

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

Progresses in the Preparation of Coke Resistant Ni‐based Catalyst for Steam and CO2 Reforming of Methane

Contact Info

Product

Resources

About

Progresses in the Preparation of Coke Resistant Ni‐based Catalyst for Steam and CO₂ Reforming of Methane