Ni/SBA-15 Catalysts for combined steam methane reforming and water gas shift—Prepared for use in catalytic membrane reactors

Gil, Ana Gouveia; Wu, Zhentao; Chadwick, David; Li, K.

doi:10.1016/j.apcata.2015.09.009

Cited by 41 publications

(6 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Here, the latest catalysis studies since then are summarized. Using conventional SMR reactors, most of the papers report Ni as the principal component but use different supports such as CaO-Ca 5 Al 6 O 14 , γ-Al 2 O 3 , K 2 Ti x O y -Al 2 O 3 , α-Al 2 O 3 , NiAl 2 O 4 , TiO 2 , SiO 2 , ZrO 2 ,Al 2 O 3 (Ca coloaded as Ca–Ni/Al 2 O 3 ), or SBA-15 . Ni has been reported to change the distribution of certain coloaded metals and improve their catalytic activity for other reactions too, apart from SMR .…”

Section: Resultsmentioning

confidence: 99%

Interplay of Kinetics and Thermodynamics in Catalytic Steam Methane Reforming over Ni/MgO-SiO₂

Kageyama

Devocht

Takagaki

et al. 2017

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The steam methane reforming (SMR) reaction was studied on a Ni/ MgO-SiO 2 catalyst at 923 K (650 °C) and 0.40 MPa in a tubular packed-bed reactor. The partial pressures of CH 4 and H 2 O were varied between 20 and 140 kPa and 80 and 320 kPa, respectively. Measurements were carried out without mass and heat transport limitations, as verified by the Weisz−Prater and Mears criteria. Experimentally, the CH 4 conversion increased with the inlet partial pressure of H 2 O and decreased with the inlet partial pressure of CH 4 . However, at low CH 4 inlet partial pressures, i.e., at 40 and 60 kPa, the conversion passed through a maximum. Rate expressions were derived based on a simple two-step sequence. A statistical analysis led to a globally significant, weighted regression and resulted in a good agreement between the model and the experimental data, as indicated by a low F value of model adequacy of 2.84. The rate and equilibrium coefficient parameters were statistically significant as indicated by narrow confidence intervals. The model was able to correctly describe the experimentally observed maximum in the methane conversion and allowed relating this behavior to CH 4 and H 2 O surface coverages. The model was able to capture the increasing selectivity to CO 2 with increasing H 2 O inlet partial pressure and methane conversion. The effect of changing the total pressure and H 2 O/CH 4 ratio on the CH 4 conversion as a function of the space velocity was simulated and corresponded to both the experimental and literature data. A major finding of the modeling was that as flow rate was increased there was a crossover in the order of conversion with pressure due to a transition from thermodynamic to kinetic control. Although the SMR equilibrium conversion decreased with pressure, away from equilibrium at high flow rates, conversion was higher at higher pressures because of enhanced adsorption rates.

show abstract

Section: Resultsmentioning

confidence: 99%

Interplay of Kinetics and Thermodynamics in Catalytic Steam Methane Reforming over Ni/MgO-SiO₂

Kageyama

Devocht

Takagaki

et al. 2017

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Thermogravimetric and Thermodifferential analyses Thermogravimetric analyses of the spent catalysts were performed with air ow and increasing temperature at 10 ºCmin -1 up to 900 ºC. The TGA and DTA results are presented in Table 4, that shows water elimination of 11.1 % and physisorbed water [57,58]. At higher temperature the weight loss was 1.8 % due to the decomposition of silanol and siloxane groups, which suggests high stability of the support at high temperatures [58,59].The spent NiMo/SBA-15catalysts showed less water elimination (5.6 %).…”

Section: Raman Spectroscopy Analysesmentioning

confidence: 99%

Identification of compounds adsorbed and deposited on the Ni-Mo catalysts surface of alumina and SBA-15 by DRIFTS, Raman and TPO Analyses before and after Guaiacol hydrodeoxygenation.

Lima

Hewer

Alves

et al. 2021

Preprint

View full text Add to dashboard Cite

We studied and identified compounds adsorbed or deposited on the catalysts surface of the Ni-Mo supported on alumina and SBA-15, before and after hydrodeoxigenation of a bio-oil model (guaiacol). Marked differences were observed on both catalysts through DRIFTS and Raman spectroscopy showing that the alumina-supported catalyst contains deposits of aromatic and oxygenated organic substances, while the carbon deposits on the SBA-15 as aliphatic simple molecules. TPO analyses confirm that the carbon deposited on the NiMo/SBA-15 catalyst were light polymer types, mainly nanotubes and nano fibers, while on the alumina catalyst the mainly carbon species formed were graphite type and heavier carbons. Post reaction analysis of the catalysts showed coke formation and carbon deposition rate of 1.14 mgcoke.gcat−1 h− 1 for NiMo/SBA-15 and the deactivation was 44 % higher for the NiMo/Al2O3 with 1.65 mgcoke.gcat−1 h− 1of carbon deposition rate.

show abstract

“…Silva et al [22] demonstrated that methane steam reforming can be performed in a packed bed membrane reactor with an up to 47% hydrogen recovery at a 35% methane conversion (at 600 • C). Additionally, Gil et al [23] used a catalytic hollow-fiber membrane reactor where the Ni-based catalyst was supported on the hollow fiber's walls, while the selective Pd-based layer was coated on the other side of the hollow-fiber wall. In this case, an up to 45% hydrogen recovery at a >50% conversion was obtained at 560 • C.…”

Section: Dehydrogenation Reactionmentioning

confidence: 99%

Latest Developments in Membrane (Bio)Reactors

Helmi

Gallucci

2020

Processes

View full text Add to dashboard Cite

The integration of membranes inside a catalytic reactor is an intensification strategy to combine separation and reaction steps in one single physical unit. In this case, a selective removal or addition of a reactant or product will occur, which can circumvent thermodynamic equilibrium and drive the system performance towards a higher product selectivity. In the case of an inorganic membrane reactor, a membrane separation is coupled with a reaction system (e.g., steam reforming, autothermal reforming, etc.), while in a membrane bioreactor a biological treatment is combined with a separation through the membranes. The objective of this article is to review the latest developments in membrane reactors in both inorganic and membrane bioreactors, followed by a report on new trends, applications, and future perspectives.

show abstract

Ni/SBA-15 Catalysts for combined steam methane reforming and water gas shift—Prepared for use in catalytic membrane reactors

Cited by 41 publications

References 22 publications

Interplay of Kinetics and Thermodynamics in Catalytic Steam Methane Reforming over Ni/MgO-SiO₂

Interplay of Kinetics and Thermodynamics in Catalytic Steam Methane Reforming over Ni/MgO-SiO₂

Identification of compounds adsorbed and deposited on the Ni-Mo catalysts surface of alumina and SBA-15 by DRIFTS, Raman and TPO Analyses before and after Guaiacol hydrodeoxygenation.

Latest Developments in Membrane (Bio)Reactors

Contact Info

Product

Resources

About

Ni/SBA-15 Catalysts for combined steam methane reforming and water gas shift—Prepared for use in catalytic membrane reactors

Cited by 41 publications

References 22 publications

Interplay of Kinetics and Thermodynamics in Catalytic Steam Methane Reforming over Ni/MgO-SiO2

Interplay of Kinetics and Thermodynamics in Catalytic Steam Methane Reforming over Ni/MgO-SiO2

Identification of compounds adsorbed and deposited on the Ni-Mo catalysts surface of alumina and SBA-15 by DRIFTS, Raman and TPO Analyses before and after Guaiacol hydrodeoxygenation.

Latest Developments in Membrane (Bio)Reactors

Contact Info

Product

Resources

About

Interplay of Kinetics and Thermodynamics in Catalytic Steam Methane Reforming over Ni/MgO-SiO₂

Interplay of Kinetics and Thermodynamics in Catalytic Steam Methane Reforming over Ni/MgO-SiO₂