Synthesis and application of highly dispersed ordered mesoporous silicon-doped Pd-alumina catalyst with high thermal stability

Zheng, Xiaohai; Chen, Xiaohua; Chen, Jiebo; Zheng, Ying; Jiang, Lilong

doi:10.1016/j.cej.2016.03.146

Cited by 43 publications

(19 citation statements)

References 46 publications

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“…It is interesting to find that there is a particle on the catalyst surface (marked by a circle), the interplanar spacing of which (ca. 0.26 nm) is determined to be corresponding to the PdO (101) lattice fringes . Besides, the particle diameter estimated from the image was found to be 6.4 nm, which is close to the value obtained from the results of the CO pulse chemisorption (Table ).…”

Section: Results and Discussionsupporting

confidence: 84%

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Synthesis of Mg-Doped Ordered Mesoporous Pd–Al₂O₃ with Different Basicity for CO, NO, and HC Elimination

Xiao

Zheng

Chen

et al. 2017

Ind. Eng. Chem. Res.

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Employing NH 4 HCO 3 as pore-enlarging agent and P123 as a template agent, ordered mesoporous Mg-doped γ-Al 2 O 3 with different basicity and large surface area have been successfully synthesized by a facile sol−gel approach by adjusting the content of magnesium and pH value. Specifically, the result alumina calcined at 1000 °C with large specific surface area (234.4 m 2 g −1 ) and high pore volume (0.72 cm 3 g −1 ) was obtained when the Mg content was 9 wt %. These materials with ordered mesostructure and advantageous structural properties were utilized as carriers of Pd−Al 2 O 3 catalysts for the catalytic reaction of simulated exhaust automobile gases including CO, NO, and hydrocarbon (HC). The results revealed that the high catalytic performance of Pd/9Mg-OMA originated from its more appropriate basicity, greater PdO dispersion, and higher surface area.

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Section: Results and Discussionsupporting

confidence: 84%

“…0.26 nm) is determined to be corresponding to the PdO (101) lattice fringes. 47 Besides, the particle diameter estimated from the image was found to be 6.4 nm, which is close to the value obtained from the results of the CO pulse chemisorption (Table 4).…”

Section: Methodssupporting

confidence: 87%

Synthesis of Mg-Doped Ordered Mesoporous Pd–Al₂O₃ with Different Basicity for CO, NO, and HC Elimination

Xiao

Zheng

Chen

et al. 2017

Ind. Eng. Chem. Res.

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“…Notably, the capillary condensation shifted toward higher relative pressures as the calcination temperature increased, suggesting an enlargement in the pore size due to development of Al 2 O 3 particles. This is consistent with the observations of Zheng et al [24] and Seo et al [25]. The MPdA samples calcined at different temperatures for 5 h were analyzed by X-ray diffraction (XRD).…”

Section: Influence Of Calcination Temperaturesupporting

confidence: 91%

Dehydrogenation of 2-[(n-Methylcyclohexyl)Methyl]Piperidine over Mesoporous Pd-Al2O3 Catalysts Prepared by Solvent Deficient Precipitation: Influence of Calcination Conditions

Bathula

et al. 2019

Catalysts

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A pair of 2-[(n-methylcyclohexyl)methyl]piperidine (H12-MBP) and its full dehydrogenation product (H0-MBP) has recently been considered as a potential liquid organic hydrogen carrier with 6.15 wt% H2 storage capacity. In the discovery of an active and stable catalyst for H2 discharge from H12-MBP at lower temperatures, a mesoporous Pd-Al2O3 catalyst (MPdA) was synthesized by a one-pot solvent deficient precipitation (SDP). In the present work, the sensitivity and effectiveness of the SDP method are examined by varying the calcination temperature and time in the preparation of the MPdA catalyst. The characterization revealed that the final properties of the MPdA catalyst greatly rely on both the calcination temperature and time. The MPdA catalyst showed better dehydrogenation activity for calcination at 600 °C than at other temperatures, because of Pd particles of smaller size with higher dispersion. Although the MPdA catalysts calcined at 600 °C for different periods of time have similar size and dispersion of Pd particles, the dehydrogenation efficiency was superior as the calcination time became shorter (e.g., 1 h), which originated from the better arrangement of Pd particles over a higher surface area. These MPdA catalysts, irrespective of the calcination time, displayed a remarkable stability in the dehydrogenation of H12-MBP owing to the protection of Pd particles by the Al2O3 layer.

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“…Figure c displays the nitrogen adsorption–desorption isotherms and Figure d illustrates the pore size distribution of 10%CeO 2 /β-SiC, β-SiC, and CeO 2 catalysts. It can be observed that all of the catalysts displayed type IV isotherms, signifying the presence of mesoporous structures with favorable pore connectivity . Particularly, the CeO 2 catalyst presented type IV isotherm, showing an H 4 -type hysteresis loop, which suggests the hybrid micropore and mesoporous pore structures; while the 10%CeO 2 /β-SiC and β-SiC catalysts exhibited H 3 -type hysteresis loops, implying an irregular pore structure, including sheet, plate crack, or wedge-like structures.…”

Section: Results and Discussionmentioning

confidence: 93%

High-Temperature Selective Oxidation of H₂S to Elemental Sulfur on a β-SiC-Supported Cerium Catalyst

Wei

et al. 2021

Ind. Eng. Chem. Res.

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H2S-selective catalytic oxidation at high temperatures is a cost-effective way to directly treat lean acid gas. Herein, cerium supported on a β-SiC catalyst was synthesized by a simple impregnation method, and the catalytic behavior for the H2S-selective oxidation reaction was evaluated at a relatively high-temperature range (300–550 °C). The 10%CeO2/β-SiC catalyst exhibited excellent H2S conversion (93%) and outstanding sulfur selectivity (94%) at 300 °C and could maintain it at 82 and 87%, respectively, even at temperatures up to 550 °C. Remarkably, the catalyst revealed prominent reaction stability, which could proceed consecutively at 550 °C for 30 h and could also run circularly from 300 to 550 °C three times without notable deactivation. This demonstrated that the β-SiC support allowed good dispersion of CeO2 particles, which further improved the reducibility of the 10%CeO2/β-SiC catalyst. Furthermore, the abundant oxygen vacancies on the catalyst surface facilitated O2 activation by providing a large amount of surface adsorbed oxygen and by improving the lattice oxygen mobility. Particularly, the high thermal stability of the β-SiC support displayed a significant role in high-temperature reactions, and the strong Ce–O–Si interaction between the β-SiC support and the CeO2 phase allowed the catalyst a good resistance to SO2 poisoning. This work provides a prospective way for the treatment of lean acid gas.

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Synthesis and application of highly dispersed ordered mesoporous silicon-doped Pd-alumina catalyst with high thermal stability

Cited by 43 publications

References 46 publications

Synthesis of Mg-Doped Ordered Mesoporous Pd–Al₂O₃ with Different Basicity for CO, NO, and HC Elimination

Synthesis of Mg-Doped Ordered Mesoporous Pd–Al₂O₃ with Different Basicity for CO, NO, and HC Elimination

Dehydrogenation of 2-[(n-Methylcyclohexyl)Methyl]Piperidine over Mesoporous Pd-Al2O3 Catalysts Prepared by Solvent Deficient Precipitation: Influence of Calcination Conditions

High-Temperature Selective Oxidation of H₂S to Elemental Sulfur on a β-SiC-Supported Cerium Catalyst

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Synthesis and application of highly dispersed ordered mesoporous silicon-doped Pd-alumina catalyst with high thermal stability

Cited by 43 publications

References 46 publications

Synthesis of Mg-Doped Ordered Mesoporous Pd–Al2O3 with Different Basicity for CO, NO, and HC Elimination

Synthesis of Mg-Doped Ordered Mesoporous Pd–Al2O3 with Different Basicity for CO, NO, and HC Elimination

Dehydrogenation of 2-[(n-Methylcyclohexyl)Methyl]Piperidine over Mesoporous Pd-Al2O3 Catalysts Prepared by Solvent Deficient Precipitation: Influence of Calcination Conditions

High-Temperature Selective Oxidation of H2S to Elemental Sulfur on a β-SiC-Supported Cerium Catalyst

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Synthesis of Mg-Doped Ordered Mesoporous Pd–Al₂O₃ with Different Basicity for CO, NO, and HC Elimination

Synthesis of Mg-Doped Ordered Mesoporous Pd–Al₂O₃ with Different Basicity for CO, NO, and HC Elimination

High-Temperature Selective Oxidation of H₂S to Elemental Sulfur on a β-SiC-Supported Cerium Catalyst