A simple method to regulate surface hydroxy groups on Al2O3 for improving catalytic oxidation performance for HCHO on Pt/Al2O3

Zhang, Zhilin; Ma, Jinzhu; He, Hong

doi:10.1039/d2cy01275h

Cited by 5 publications

(3 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The micrographs revealed that the Pt nanoparticles were uniformly anchored on the support, with average sizes of approximately 3.75, 4.26, 4.75, and 4.94 nm for 0.3 wt % Pt/SiO 2 –C, 0.3 wt % Pt/SiO 2 –OH, 0.5 wt % Pt/SiO 2 –C, and 0.5 wt % Pt/SiO 2 –OH catalysts, respectively. High-resolution transmission electron microscopy (HR-TEM) analysis indicated lattice fringes measuring around 0.225 nm (Figure S3), corresponding to the Pt(111) basal plane . Furthermore, the high-angle annular dark-field imaging (HAADF) and energy-dispersive X-ray (EDX) elemental mapping images (Figure a–d) provided additional evidence of the uniform distribution of Pt particles on the SiO 2 –OH support.…”

Section: Resultsmentioning

confidence: 93%

Hydroxyl-Decorated Pt as a Robust Water-Resistant Catalyst for Catalytic Benzene Oxidation

Zhou

Deng

et al. 2023

Inorg. Chem.

View full text Add to dashboard Cite

In catalytic oxidation reactions, the presence of environmental water poses challenges to the performance of Pt catalysts. This study aims to overcome this challenge by introducing hydroxyl groups onto the surface of Pt catalysts using the pyrolysis reduction method. Two silica supports were employed to investigate the impact of hydroxyl groups: SiO2–OH with hydroxyl groups and SiO2–C without hydroxyl groups. Structural characterization confirmed the presence of Pt–O x , Pt–OH x , and Pt0 species in the Pt/SiO2–OH catalysts, while only Pt–O x and Pt0 species were observed in the Pt/SiO2–C catalysts. Catalytic performance tests demonstrated the remarkable capacity of the 0.5 wt % Pt/SiO2–OH catalyst, achieving complete conversion of benzene at 160 °C under a high space velocity of 60,000 h–1. Notably, the catalytic oxidation capacity of the Pt/SiO2–OH catalyst remained largely unaffected even in the presence of 10 vol % water vapor. Moreover, the catalyst exhibited exceptional recyclability and stability, maintaining its performance over 16 repeated cycles and a continuous operation time of 70 h. Theoretical calculations revealed that the construction of Pt–OH x sites on the catalyst surface was beneficial for modulating the d-band structure, which in turn enhanced the adsorption and activation of reactants. This finding highlights the efficacy of decorating the Pt surface with hydroxyl groups as an effective strategy for improving the water resistance, catalytic activity, and long-term stability of Pt catalysts.

show abstract

Section: Resultsmentioning

confidence: 93%

Hydroxyl-Decorated Pt as a Robust Water-Resistant Catalyst for Catalytic Benzene Oxidation

Zhou

Deng

et al. 2023

Inorg. Chem.

View full text Add to dashboard Cite

show abstract

“…Besides oxygen vacancy, the other most common type of defect is hydroxyl (OH) groups, which are always present on the surface of an oxide even in ultrahigh-vacuum (UHV) conditions . There have been some comprehensive reports revealing the anchoring effects of hydroxyls during metal oxidative redispersion, early in Ag/SiO 2 , , and then more extensively in Ag/Al 2 O 3 − and Pt/Al 2 O 3 . − However, most of them were based on nonreducible supports with wide band gaps and poor ability to produce surface oxygen vacancies . The roles and interplays between oxygen vacancies and hydroxyls on reducible supports (like CeO 2 ) during metal oxidative redispersion are still to be explored.…”

Section: Introductionmentioning

confidence: 99%

Oxidative Redispersion-Derived Single-Site Ru/CeO₂ Catalysts with Mobile Ru Complexes Trapped by Surface Hydroxyls Instead of Oxygen Vacancies

Liu,

Zheng,

Liu

et al. 2024

ACS Catal.

View full text Add to dashboard Cite

Controlling the oxidative redispersion behavior of supported metal nanoparticles is of central importance in producing high-performance catalysts applied under industry-related oxidation conditions. So far, considerable efforts have been paid to understanding reactant (including O 2 )-induced disintegration, while much less is known about the influences of support defects like hydroxyl (OH) and oxygen vacancy (V O ) on the stabilization of metal−reactant complexes. In this article, by using H 2 as a reducing agent, the roles of OH groups and V O in oxidative redispersion of Ru over CeO 2 nanorods were distinguished and further disentangled by comparison with the cases of CO-pretreated Ru/CeO 2 . Supported by electron microscopy, in situ diffuse reflectance infrared Fourier transform spectroscopy, in situ X-ray photoelectron spectroscopy, Raman, and other characterizations, we showed that the doubly bridging OH (II) groups on CeO 2 (111) steps (type II or III) played major roles in stabilizing Ru−O x complexes and producing atomically dispersed Ru species, while the surface V O sites assisted dehydrogenation and prevented OH overcapping on the reactive Ru sites. The propylene combustion activity of the thus-obtained single-site Ru/ CeO 2 was far superior to that of a benchmark Pt/Al 2 O 3 catalyst. The results suggested that well-designed H 2 treatments could be used to maximize the effectiveness of (reactant-induced) metal redispersion over CeO 2 , and attention should be paid on possible metal redispersion when dealing with catalysis over systems accessible to reactants (e.g., hydrogen, water, and/or hydrocarbons) that give rise to CeO 2 surface hydroxyls in working conditions.

show abstract

“…based catalysts, have the greatest potential for the removal of HCHO at room temperature. [5][6][7][8][9][10][11][12] After appropriate catalyst modification, HCHO can be completely converted into CO 2 and H 2 O at room temperature. 13 However, the cost of supported precious metal catalysts is relatively high.…”

Section: Introductionmentioning

confidence: 99%

Abnormal inhibiting effect of H₂O on Pd/SiO₂ and Na–Pd/SiO₂ catalysts for HCHO oxidation

Wang,

Liu

et al. 2023

Catal. Sci. Technol.

View full text Add to dashboard Cite

show abstract

A simple method to regulate surface hydroxy groups on Al₂O₃ for improving catalytic oxidation performance for HCHO on Pt/Al₂O₃

Abstract: For supported noble metal catalysts, the properties of the support had great influence on the state of noble metals. Herein, we chose Al2O3 as model to find a simple method...

Cited by 5 publications

References 51 publications

Hydroxyl-Decorated Pt as a Robust Water-Resistant Catalyst for Catalytic Benzene Oxidation

Hydroxyl-Decorated Pt as a Robust Water-Resistant Catalyst for Catalytic Benzene Oxidation

Oxidative Redispersion-Derived Single-Site Ru/CeO₂ Catalysts with Mobile Ru Complexes Trapped by Surface Hydroxyls Instead of Oxygen Vacancies

Abnormal inhibiting effect of H₂O on Pd/SiO₂ and Na–Pd/SiO₂ catalysts for HCHO oxidation

Contact Info

Product

Resources

About

A simple method to regulate surface hydroxy groups on Al2O3 for improving catalytic oxidation performance for HCHO on Pt/Al2O3

Abstract: For supported noble metal catalysts, the properties of the support had great influence on the state of noble metals. Herein, we chose Al2O3 as model to find a simple method...

Cited by 5 publications

References 51 publications

Hydroxyl-Decorated Pt as a Robust Water-Resistant Catalyst for Catalytic Benzene Oxidation

Hydroxyl-Decorated Pt as a Robust Water-Resistant Catalyst for Catalytic Benzene Oxidation

Oxidative Redispersion-Derived Single-Site Ru/CeO2 Catalysts with Mobile Ru Complexes Trapped by Surface Hydroxyls Instead of Oxygen Vacancies

Abnormal inhibiting effect of H2O on Pd/SiO2 and Na–Pd/SiO2 catalysts for HCHO oxidation

Contact Info

Product

Resources

About

A simple method to regulate surface hydroxy groups on Al₂O₃ for improving catalytic oxidation performance for HCHO on Pt/Al₂O₃

Oxidative Redispersion-Derived Single-Site Ru/CeO₂ Catalysts with Mobile Ru Complexes Trapped by Surface Hydroxyls Instead of Oxygen Vacancies

Abnormal inhibiting effect of H₂O on Pd/SiO₂ and Na–Pd/SiO₂ catalysts for HCHO oxidation