Hydrogen production via methanol oxidation on platinum oxide thin film catalyst: Influence of methanol-to-oxygen ratio

Rednyk, Andrii; Ostroverkh, Anna; Johánek, Viktor

doi:10.1016/j.ijhydene.2017.10.052

Cited by 16 publications

(5 citation statements)

References 43 publications

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“…Many noble catalysts, such as palladium [10] and platinum [11], have been used for the hydrogenation reaction of oxygen-containing molecules. However, such metals are expensive, and hence the problem of developing alternative lower-cost metals as catalysts for hydro-deoxygenation reactions has attracted great attention in the literature [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Mesoporous Cu-Ni/Al2O4 Catalyst for Hydrogen Production via Hydrothermal Reconstruction Route

et al. 2021

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Mesoporous Cu-Ni/Al2O4 catalyst of high surface area (176 m2g−1) is synthesized through a simple hydrothermal reconstruction process by using low-cost activated alumina as the aluminate source without organic templates. The desired mesoporous structure of the catalyst is formed by the addition of Cu2+ and Ni2+ metal ions in the gel solution of the activated alumina followed by hydrothermal treatment at 70 °C and calcination at temperatures in the range of 600 to 800 °C. To consider the environmental concern, we found the concentration of the Cu2+ and Ni2+ ion in the residual filtrate is less than 0.1 ppm which satisfies the effluent standard in Taiwan (<1.0 ppm). The effects of the pH value, hydrothermal treatment time, and calcination temperature on the structure, morphology and surface area of the synthesized Cu-Ni/Al2O4 composites are investigated as well. In addition, the Cu-Ni/Al2O4 catalyst synthesized at pH 9.0 with a hydrothermal treatment time of 24 h and a calcination temperature of 600 °C is used for hydrogen production via the partial oxidation of methanol. The conversion efficiency is found to be >99% at a reaction temperature of around 315 °C, while the H2 yield is 1.99 mol H2/mol MeOH. The catalyst retains its original structure and surface area following the reaction process, and is thus inferred to have a good stability. Overall, the hydrothermal reconstruction route described herein is facile and easily extendable to the preparation of other mesoporous metal-alumina materials for catalyst applications.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Mesoporous Cu-Ni/Al2O4 Catalyst for Hydrogen Production via Hydrothermal Reconstruction Route

et al. 2021

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“…We use first-principles DFT to examine the thermodynamics of Pt-ion incorporation into the reconstructed (including near-surface Mg ↔ Al antisite defects, see Methods) MgAl 2 O 4 , beginning from the surface, where top-layer Mg has been replaced with 2 Hs (terminated as ...–O 4 Al 4 O 4 –MgAl–O 4 Al 3 MgO 4 –H 2 ). Pt prefers to have an oxidation state of 0, 2+, or 4+ − The Pt atom could adsorb as a neutral atom (Figure a), or it could adsorb as two H surface ions are desorbed, making Pt 2+ (Figure b). Under the conditions of the aging process, it is found that neither the Pt 0 nor Pt 2+ bonding modes are stable enough to favor atomic adsorption.…”

Section: Resultsmentioning

confidence: 99%

Reversible Atomization and Nano-Clustering of Pt as a Strategy for Designing Ultra-Low-Metal-Loading Catalysts

et al. 2022

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Noble metal-based catalysts have numerous industrial uses, and maximum utilization of the precious metals by lowering the metal loading is of significant interest in heterogeneous catalysis research. However, lowering the metal loading could lead to single-atom metal species formation, which may not be active for important reactions like propylene oxidation. We report a way to drastically reduce precious metal loading of catalysts by judiciously choosing an active metal/support pair and using the reversible atomization−nanoparticulate formation of transition metal on a high-surface area support. Here, Pt and MgAl 2 O 4 are used as the transition metal and high-surface area support, respectively. Through catalytic testing and characterization using scanning transmission electron microscopy and synchrotron X-ray absorption spectroscopy, a reversible change between atomization and nano-cluster formation under oxidizing and reducing conditions has been found. Via density functional theory, favorable sites for reversible Pt adsorption are identified, including ionic Pt 4+ sites that can serve to nucleate nanoclusters. Catalytic reaction modeling also rationalizes the catalytic inertness of atomic Pt sites. Finally, a re-activation mechanism for the atomized Pt based on gases present during reaction has been formulated and demonstrated.

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“…In general, the average reaction temperature is about 300°C, based on the results shown in Figure 3A. Rednyk et al 40 studied the POM using platinum oxide thin film catalyst for hydrogen production and found that a higher reaction temperature or O 2 /C ratio favored H 2 yield production. The CH 3 OH conversion for the 17 cases is shown in Figure 3B.…”

Section: Resultsmentioning

confidence: 99%

Hydrogen production optimization from methanol partial oxidation via ultrasonic sprays using response surface methodology and analysis of variance

Chen

Chiu

Chein

et al. 2022

Intl J of Energy Research

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Hydrogen production via partial oxidation of methanol (POM) in an ultrasonic spray system was studied experimentally, using an h-BN-Pt/Al 2 O 3 catalyst with ultra-low Pt contents (0.2 wt%). The effects of oxygen-to-methanol (O 2 /C) ratio, methanol flow rate, and gas hourly space velocity (GHSV) of air and carrier gas on H 2 yield were examined. Compared to conventional spray systems, the ultrasonic spray system could produce more uniformly dispersed methanol and thus further enhance the POM reaction. The results showed a higher O 2 /C ratio (0.8) enhanced the POM, which poses higher CH 3 OH conversion, higher reaction temperature, and lower CO and CH 4 productions. The CO 2 concentration was mainly affected by GHSV and CH 3 OH flow rate. A higher GHSV led to a quicker retention time for the reactants in the catalyst bed, and a lower CH 3 OH flow rate deteriorates the CO 2 concentration. Based on the Box Behnken design (BBD) from response surface methodology (RSM) and analysis of variance (ANOVA), the optimal operating conditions are found to be O 2 /C ratio = 0.8, CH 3 OH flow rate = 0.7 mL min À1 , and GHSV = 10 000 h À1 . Combining these conditions, the predicted maximum H 2 yield is 1.635 mol‧(mol CH 3 OH) À1 which is close to the experimental value of 1.646 mol‧(mol CH 3 OH) À1 . The RSM and ANOVA not only resulted in a quadratic response surface regression model and significant regression coefficients but also indicated CH 3 OH flow rate being the primary factor.analysis of variance (ANOVA), h-BN-Pt/Al 2 O 3 catalyst, hydrogen production, partial oxidation of methanol (POM), response surface methodology (RSM), ultrasonic sprays

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Hydrogen production via methanol oxidation on platinum oxide thin film catalyst: Influence of methanol-to-oxygen ratio

Cited by 16 publications

References 43 publications

Synthesis of Mesoporous Cu-Ni/Al2O4 Catalyst for Hydrogen Production via Hydrothermal Reconstruction Route

Synthesis of Mesoporous Cu-Ni/Al2O4 Catalyst for Hydrogen Production via Hydrothermal Reconstruction Route

Reversible Atomization and Nano-Clustering of Pt as a Strategy for Designing Ultra-Low-Metal-Loading Catalysts

Hydrogen production optimization from methanol partial oxidation via ultrasonic sprays using response surface methodology and analysis of variance

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