VOx-Pt/Al2O3 catalysts for hydrogen production

Kokumai, Tathiana Midori; Cantane, Daniel A.; Melo, Guilherme Tavares De; Paulucci, Luigi Baldini; Zanchet, Daniela

doi:10.1016/j.cattod.2016.09.021

Cited by 11 publications

(3 citation statements)

References 47 publications

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“…The addition of Mo was also investigated by Osman et al [60], in Pt and Cu supported on Kokumai et al [61] studied the effect of vanadium addition to Pt/Al 2 O 3 catalysts for the WGS reaction. The results showed an enhance catalyst activity, however, the increase of V content did not clearly affect the WGS activity, which might be related to the formation of polymeric VO x species interacting with alumina surface instead of new interfacial Pt-VO x sites that would favour the reaction.…”

Section: The Addition Of Na Re Mo V and Nimentioning

confidence: 99%

Platinum Based Catalysts in the Water Gas Shift Reaction: Recent Advances

Palma

Ruocco

Cortese

et al. 2020

Metals

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The water gas shift (WGS) is an equilibrium exothermic reaction, whose corresponding industrial process is normally carried out in two adiabatic stages, to overcome the thermodynamic and kinetic limitations. The high temperature stage makes use of iron/chromium-based catalysts, while the low temperature stage employs copper/zinc-based catalysts. Nevertheless, both these systems have several problems, mainly dealing with safety issues and process efficiency. Accordingly, in the last decade abundant researches have been focused on the study of alternative catalytic systems. The best performances have been obtained with noble metal-based catalysts, among which, platinum-based formulations showed a good compromise between performance and ease of preparation. These catalytic systems are extremely attractive, as they have numerous advantages, including the feasibility of intermediate temperature (250–400 °C) applications, the absence of pyrophoricity, and the high activity even at low loadings. The particle size plays a crucial role in determining their catalytic activity, enhancing the performance of the nanometric catalytic systems: the best activity and stability was reported for particle sizes < 1.7 nm. Moreover the optimal Pt loading seems to be located near 1 wt%, as well as the optimal Pt coverage was identified in 0.25 ML. Kinetics and mechanisms studies highlighted the low energy activation of Pt/Mo2C-based catalytic systems (Ea of 38 kJ·mol−1), the associative mechanism is the most encountered on the investigated studies. This review focuses on a selection of recent published articles, related to the preparation and use of unstructured platinum-based catalysts in water gas shift reaction, and is organized in five main sections: comparative studies, kinetics, reaction mechanisms, sour WGS and electrochemical promotion. Each section is divided in paragraphs, at the end of the section a summary and a summary table are provided.

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Section: The Addition Of Na Re Mo V and Nimentioning

confidence: 99%

Platinum Based Catalysts in the Water Gas Shift Reaction: Recent Advances

Palma

Ruocco

Cortese

et al. 2020

Metals

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“…Dehydrogenation of propane (PDH) and oxidative dehydrogenation (ODH) of propane have been developed as the new propylene producing technologies ,. ODH is exothermic and the high temperatures will be reached during this process, although favorable from a kinetic point of view, over oxidation of propane to carbon dioxide in the reaction will result in undesired side reactions as cracking at the high temperatures, which contribute to the low selectivity and rapid coking of the catalyst . Since the low selectivity of ODH, direct dehydrogenation of propane to propylene has attracted much attention …”

Section: Introductionmentioning

confidence: 99%

One‐Pot Preparation of Ni₂P/γ‐Al₂O₃ Catalyst for Dehydrogenation of Propane to Propylene

et al. 2018

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The γ‐Al2O3 supported Ni2P catalysts for propane dehydrogenation were prepared by one‐pot method and evaluated to study the platinum‐like behaviour of Ni2P. The catalysts were characterized by X‐ray diffraction (XRD), Scanning Electron Microscope (SEM), Energy‐dispersive X‐ray Spectrometer (EDS), N2 adsorption at −196 oC and temperature‐programmed desorption of ammonia (NH3‐TPD). Results show that Ni2P is beneficial to the catalytic stability. It exhibits higher conversion for PDH of 23.8% and propylene selectivity of 74.4%.

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“…For the purpose of catalytic hydrogenation, the active component of the catalyst is determined. It was noticed that noble metals, such as platinum (Pt) [ 24 , 25 , 26 ] and palladium (Pd) [ 27 , 28 , 29 ], are the most widely used metal components in industrial hydrogenation catalysts due to the fact of their good hydrogenation activity and excellent stability. However, their hydrogenation ability in the PET steam-assisted pyrolysis process has not been explored.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Steam-Assisted Pyrolysis of PET for the Upgrading of TPA

Song

Zhang

et al. 2023

Materials

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Compared with conventional pyrolysis, steam-assisted pyrolysis of polyethylene terephthalate (PET) can effectively eliminate char and upgrade terephthalic acid (TPA). However, during steam-assisted pyrolysis of PET, the degree of cracking still varies greatly, and while some of the product is excessively cracked to gas, the other part is still insufficiently cracked. In addition, these two types of products seriously affect the yield and purity of TPA. To further enhance the TPA, an attempt was made to reduce these impurities simultaneously by synergistic catalysis among the different components of the metal–acid catalyst. Through a series of experiments, Pt@Hzsm-5 was screened as the optimal catalyst. In the catalytic steam-assisted pyrolysis of PET, the optimum reaction temperature decreased to 400 °C, the calculated yield of TPA increased to 98.23 wt%, and the purity increased to 92.2%. The Pt@Hzsm-5 could be recycled three times with no significant decrease in the obtained yield of TPA. The catalytic mechanism of the Pt@Hzsm-5 was investigated through the analysis of the products and isotope tracing experiments. The Pt catalyzed the hydrogen transfer reaction between the water molecules and PET molecules, which inhibited the excessive cracking of TPA by improving the hydrogen transfer efficiency, reduced the generation of gaseous products, and improved the calculated yield of TPA. In contrast, the Hzsm-5 catalyzed the reaction of monovinyl ester cracking to TPA, effectively reducing the impurities in the solid product, increasing the olefin yield, and improving the purity of TPA. This discovery not only clarifies the synergistic catalytic effect of the Pt@Hzsm-5 in the steam-assisted pyrolysis of the PET reaction but also lays the foundation for further screening of other inexpensive metal–acid catalysts. This is of great significance to realize the industrial application of TPA preparation by PET pyrolysis.

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VOx-Pt/Al2O3 catalysts for hydrogen production

Cited by 11 publications

References 47 publications

Platinum Based Catalysts in the Water Gas Shift Reaction: Recent Advances

Platinum Based Catalysts in the Water Gas Shift Reaction: Recent Advances

One‐Pot Preparation of Ni₂P/γ‐Al₂O₃ Catalyst for Dehydrogenation of Propane to Propylene

Catalytic Steam-Assisted Pyrolysis of PET for the Upgrading of TPA

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VOx-Pt/Al2O3 catalysts for hydrogen production

Cited by 11 publications

References 47 publications

Platinum Based Catalysts in the Water Gas Shift Reaction: Recent Advances

Platinum Based Catalysts in the Water Gas Shift Reaction: Recent Advances

One‐Pot Preparation of Ni2P/γ‐Al2O3 Catalyst for Dehydrogenation of Propane to Propylene

Catalytic Steam-Assisted Pyrolysis of PET for the Upgrading of TPA

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Product

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One‐Pot Preparation of Ni₂P/γ‐Al₂O₃ Catalyst for Dehydrogenation of Propane to Propylene