Selective Oxidation of Glyoxal to Glyoxalic Acid by Air over Mesoporous Silica Supported Pd Catalysts

Liu, Junchi; Qin, Feng; Huang, Zhen; Huang, Liang; Liao, Zhenan; Xu, Hualong; Shen, Wei

doi:10.1007/s10562-019-02799-3

Cited by 10 publications

(10 citation statements)

References 29 publications

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“…The small‐angle XRD pattern of KIT‐6 in Figure 1a indicates the presence of a well‐ordered bi‐continuous cubic three‐dimensional pore structure based on the visible intense characteristic peak at 2 θ = 0.94° and three less intense peaks at 1°, 1.6°, and 1.7° corresponding to (220), (420), and (332) 34,35 . The formation of the uniform mesoporous structure of KIT‐6 is further supported by N 2 adsorption–desorption isotherms suggesting type IV isotherms with a sharp capillary condensation step at high relative pressure and H1 hysteresis (Figure 1b).…”

Section: Resultsmentioning

confidence: 78%

“…The formation of the uniform mesoporous structure of KIT‐6 is further supported by N 2 adsorption–desorption isotherms suggesting type IV isotherms with a sharp capillary condensation step at high relative pressure and H1 hysteresis (Figure 1b). 35,36 The introduction of heteroatoms has an obvious effect on the physicochemical properties of mesoporous silica materials 32 . The intensity of the diffraction peaks for the (211) lattice plane for Al‐K 80 and Al‐K 40 is reduced by varying degrees after the introduction of Al.…”

Section: Resultsmentioning

confidence: 99%

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Highly dispersed Cu supported on mesoporous Al‐KIT‐6 for oxidative carbonylation of methanol to dimethyl carbonate

Yan

Zhao

et al. 2020

Applied Organom Chemis

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Microporous NaY zeolite is a common support of Cu catalysts for oxidative carbonylation of methanol, but the dispersion of Cu species on NaY is usually subjected to its micropore size. Here, ordered mesoporous KIT‐6 was employed as the support for Cu catalyst and Al was incorporated into its framework to increase the surface acidity, which eventually improves the surface exchange capacity and Cu dispersion. The evolution of the state of Cu species on KIT‐6 was analyzed combined with control of Cu loading. The physicochemical properties of the supports and corresponding catalysts were characterized by N2 adsorption–desorption, X‐ray diffraction, ammonia temperature programmed desorption, Fourier transform infrared spectra, transmission electron microscopy, hydrogen temperature programmed reduction, and X‐ray photoelectron spectroscopy. It was found that mesoporous KIT‐6 showed better Cu dispersion than microporous NaY zeolite. Agglomerated CuO, dispersed CuO, and Cu2+ are the major Cu species observed on the catalyst surface. The increased surface acidic sites of KIT‐6 by Al incorporation promoted the formation of Cu2+ and dispersion of CuO. With the increase in Cu loading, the Cu2+ content in the catalyst was decreased gradually along with increase in the bulk CuO. It was speculated that some exchanged Cu2+ could be transformed into highly dispersed CuO and even bulk CuO after calcination at a high Cu loading. Combined with the catalyst evaluation results, it was deduced that highly dispersed Cu2+ and CuO particles play significant roles in catalytic activity. The catalyst Cu/Al‐K‐10 achieved the highest space time yield of dimethyl carbonate of 135.4 mg/(g·h), which is 2.7 times the Cu/K‐10 owing to its more dispersed Cu species. This laid the basis for preparing highly dispersed Cu species on mesoporous silica supports.

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Section: Resultsmentioning

confidence: 78%

Section: Resultsmentioning

confidence: 99%

Highly dispersed Cu supported on mesoporous Al‐KIT‐6 for oxidative carbonylation of methanol to dimethyl carbonate

Yan

Zhao

et al. 2020

Applied Organom Chemis

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“…These phenomena are caused by the introduction of vanadium species. [12] Compared to VO x /SiO 2 , both VO x /KIT-6 and VO x /SBA-15 catalysts possess higher S BET and pore volume.…”

Section: Resultsmentioning

confidence: 94%

“…[10] Sridevi et al [11] reported that the cyclohexanol conversion rates over Cu/SBA-15 and Cu/KIT-6 reached nearly 70 %, which were more than 10 % higher than that of Cu/SiO 2 . Liu et al [12] found that the glyoxal conversion of Pd/KIT-6 was 8.5 % higher than that of Pd/SBA-15. At present, there are very few studies on the effect of mesoporous silica supports with different pore structures on soot oxidation, especially for plasma-induced reactions.…”

Section: Introductionmentioning

confidence: 99%

Plasma‐Catalytic Reactions for Soot Oxidation on VO_x/M (M=KIT‐6, SBA‐15 and SiO₂) Catalysts: Influence of Pore Structure

Zhu

et al. 2022

ChemistrySelect

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In this work, the effect of pore structure for VO x /M (M = KIT-6, SBA-15 and SiO 2 ) catalysts on plasma-catalytic soot oxidation was investigated. The combination of VO x /KIT-6 and plasma shows the highest soot oxidation rate, followed by VO x /SBA-15packed and VO x /SiO 2 -packed plasma reactor. The soot oxidation rate of 97.4 % and the energy efficiency of 0.95 g kWh À 1 can be achieved in plasma-catalytic soot oxidation over VO x /KIT-6 at 30 th min and 20 W. The catalysts were characterized by N 2 adsorption-desorption, X-ray diffraction (XRD), transmission electron microscopy (TEM), hydrogen temperature-programmed reduction (H 2 -TPR) and X-ray photoelectron spectroscopy (XPS). The results illustrated that VO x /KIT-6 and VO x /SBA-15 had large specific surface areas and good dispersion of vanadium species. The H 2 -TPR and XPS results confirmed that VO x /KIT-6 had stronger reducibility and higher relative content of O ads /(O ads + O latt ) than those of VO x /SBA-15 and VO x /SiO 2 . The good performance of soot oxidation in the plasma-catalytic systems over VO x /KIT-6 could be attributed to 1) the welldeveloped 3D mesoporous structure, which facilitated the transportation of radicals and active species, and 2) improved redox properties of VO x /KIT-6, since more active sites and surface adsorbed oxygen species on the catalyst surfaces could contribute to soot oxidation.

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“…The 1–5 nm PdO nanoparticles were evenly dispersed on the surface of SiO 2 , leading to a high reaction efficiency for catalytic oxidation . Liu et al prepared a few Pd/mesoporous silica catalysts by an acetic acid impregnation method, and KIT-6 with a three-dimensional mesoporous structure improved the dispersity of Pd, thus elevating the catalytic activity in selective oxidation of glyoxal . The physicochemical properties of supports play an important role in a highly efficient catalyst.…”

Section: Introductionmentioning

confidence: 99%

Surface Modification by Amino Group Inducing for Highly Efficient Catalytic Oxidation of Toluene over a Pd/KIT-6 Catalyst

et al. 2022

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Toluene is one of the typical volatile organic compounds in industry, particularly in energy and fuels production processes, which is required to be eliminated effectively to protect the environment. Catalytic oxidation of toluene is widely studied for its high efficiency, and rational design and synthesis of metal catalysts are keys for toluene oxidation. In this study, an efficient catalyst was designed and synthesized by introducing −NH 2 groups on the ordered mesoporous silica (KIT-6) surface to anchor and disperse Pd species, leading to Pd nanoparticles being highly dispersed with uniform particle size distribution. Meanwhile, it was found that the introduction of −NH 2 made Pd centers present an electron-rich state, and the active Pd centers could activate O 2 molecules to generate more reactive oxygen species and promote the conversion of toluene, which was verified by in situ XPS and O 2 -TPD characterization. Compared with the catalysts prepared by an impregnation method, the catalytic performance of the Pd/ NH 2 -KIT-6 (0.5 wt %) catalyst was significantly improved. A conversion of 90% for toluene (2400 ppm, 24,000 mL•g −1 •h −1 ) was achieved at 171 °C, and the toluene conversion was maintained above 90% for 900 min, displaying the excellent activity and stability of the Pd/NH 2 -KIT-6 catalyst.

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Selective Oxidation of Glyoxal to Glyoxalic Acid by Air over Mesoporous Silica Supported Pd Catalysts

Cited by 10 publications

References 29 publications

Highly dispersed Cu supported on mesoporous Al‐KIT‐6 for oxidative carbonylation of methanol to dimethyl carbonate

Highly dispersed Cu supported on mesoporous Al‐KIT‐6 for oxidative carbonylation of methanol to dimethyl carbonate

Plasma‐Catalytic Reactions for Soot Oxidation on VO_x/M (M=KIT‐6, SBA‐15 and SiO₂) Catalysts: Influence of Pore Structure

Surface Modification by Amino Group Inducing for Highly Efficient Catalytic Oxidation of Toluene over a Pd/KIT-6 Catalyst

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Selective Oxidation of Glyoxal to Glyoxalic Acid by Air over Mesoporous Silica Supported Pd Catalysts

Cited by 10 publications

References 29 publications

Highly dispersed Cu supported on mesoporous Al‐KIT‐6 for oxidative carbonylation of methanol to dimethyl carbonate

Highly dispersed Cu supported on mesoporous Al‐KIT‐6 for oxidative carbonylation of methanol to dimethyl carbonate

Plasma‐Catalytic Reactions for Soot Oxidation on VOx/M (M=KIT‐6, SBA‐15 and SiO2) Catalysts: Influence of Pore Structure

Surface Modification by Amino Group Inducing for Highly Efficient Catalytic Oxidation of Toluene over a Pd/KIT-6 Catalyst

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Plasma‐Catalytic Reactions for Soot Oxidation on VO_x/M (M=KIT‐6, SBA‐15 and SiO₂) Catalysts: Influence of Pore Structure