SBA-15-supported Pd catalysts: The effect of pretreatment conditions on particle size and its application to benzyl alcohol oxidation

Liu, Chun-Hsia; Lin, Cheng-Yao; Chen, Jeng-Lung; Lu, Kueih‐Tzu; Lee, Jyh‐Fu; Chen, Jin‐Ming

doi:10.1016/j.jcat.2017.01.019

Cited by 45 publications

(15 citation statements)

References 35 publications

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“…Various methods, such as two solvents [ 21 ], surfactant assistant [ 22 ], and ammonia evaporation [ 23 ] methods have been used to improve the dispersion of Ni on SBA-15 support. Recently, vacuum thermal treatment was applied to synthesize highly dispersed Cu [ 24 ], Pt [ 25 ], and Pd [ 26 ] particles on mesoporous SBA-15. In the present work, the Ni-CeO 2 /SBA-15 catalyst was prepared by the impregnation method with vacuum thermal treatment and used for CO 2 methanation.…”

Section: Introductionmentioning

confidence: 99%

Vacuum Thermal Treated Ni-CeO2/SBA-15 Catalyst for CO2 Methanation

Wang

Liu

et al. 2018

Nanomaterials

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Ni-CeO2/SBA-15-V catalyst was prepared by the impregnation method with vacuum thermal treatment and used for CO2 methanation reaction. Compared with Ni-CeO2/SBA-15-air catalyst with thermal treatment in air, the reduced Ni-CeO2/SBA-15-V catalyst with vacuum thermal treatment exhibited higher Ni dispersion and smaller Ni particle size. In CO2 methanation reaction, the Ni-CeO2/SBA-15-V catalyst was more active and selective than the Ni-CeO2/SBA-15-air catalyst. The good activity and selectivity of Ni-CeO2/SBA-15-V catalyst should be due to highly dispersed Ni in contact with small CeO2 particles.

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Section: Introductionmentioning

confidence: 99%

Vacuum Thermal Treated Ni-CeO2/SBA-15 Catalyst for CO2 Methanation

Wang

Liu

et al. 2018

Nanomaterials

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“…In detail, colbat was loaded on sepiolite from 3-5 wt.%, the benzyl alcohol conversion gradually increases, but then the decreases over 7.0 wt.% CoOx/magnesium silicate. This observation was interpreted by the agglomerate of cobalt oxide particles [6,8,10]. The formation of larger particles of CoOx would remarkably reduce the contacting probability between active cobalt ion sites and reactants, and therefore prevent benzyl alcohol from conversion into the corresponding aldehyde [3,5,10].…”

Section: Oxidation Of Benzyl Alcohol Over Coox/sepiolitesmentioning

confidence: 99%

“…However, these methods have many drawbacks such as contaminating chlorides and low selectivity towards benzaldehyde. Therefore, the catalytic oxidation of benzyl alcohol is a good choice to surpass these obstacles [4][5][6]. Typical catalysts are widely used for the oxidation of benzyl alcohol consisting of transition metal oxides loaded on the carriers as Au-Au-Pd/ceria-zirconia [5], Pd/SBA-15 [6], CoOx/MnOx [7]… Magnesium silicate, a soft white clay mineral known as sepiolite, has the theoretical unit cell formula of (Si12Mg8O30)(OH2)4.8H2O [8].…”

Section: Introductionmentioning

confidence: 99%

Preparation of CoOx/magenium silicate for the liquid oxidation of benzyl alcohol

Thi

Ngoc

Quoc

et al. 2020

vietnam j. catal. adsorpt.

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CoOx/magenium silicate catalysts are obtained though precipitation and calcination method. The prepared solids were analyzed by XRD, BET, EDS... Cobalt(II) ions supported-magnesium silicate catalysts expressed as effective catalysts for selective oxidation of benzyl alcohol using tert-butyl hydroperoxide as an oxidizing agent. The experimental results showed very high selectivity to the benzaldehyde product at benzyl alcohol conversion of 18-25%.

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“…Although a great deal of effort has been made to correlate the catalytic performance with the state and size of the Pd component and reaction atmosphere, there is still considerable controversy on the state of the most active Pd species as well as the size effect of supported Pd particles [7][8][9][10]. Various Pd species, including bulk PdO [5], metallic Pd [9], Pd oxide covered on metallic Pd [11,12], and the co-existence of Pd and PdO [13], have been attributed to the most active sites in lean methane oxidation.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Pd/SiO2 Catalysts by a Simple Dry Ball-Milling Method for Lean Methane Oxidation and Probe of the State of Active Pd Species

et al. 2021

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A series of Pd/SiO2 catalysts were prepared with different Pd precursors by a dry ball-milling method and used in the catalytic oxidation of lean methane at low temperature. The effect of Pd precursors on the catalytic performance was investigated and the state of the most active Pd species was probed. The results indicate that dry ball-milling is a simple but rather effective method to prepare the Pd/SiO2 catalysts for lean methane oxidation, and palladium acetylacetonate is an ideal precursor to obtain a highly active Pd/SiO2-Acac catalyst with well- and stably dispersed Pd species, owing to the tight contact between acetylacetonate and Si–OH on the SiO2 support. Besides the size and dispersion of Pd particles, the oxidation state of Pd species also plays a crucial role in determining the catalytic activity of Pd/SiO2 in lean methane oxidation at low temperature. A non-monotonic dependence of the catalytic activity on the Pd oxidation state is observed. The activity of various Pd species follows the order of PdOx >> Pd > PdO; the PdOx/SiO2-Acac catalysts (in particular for PdO0.82/SiO2-Acac when x = 0.82) exhibit much higher activity in lean methane oxidation at low temperature than Pd/SiO2-Acac and PdO/SiO2-Acac. The catalytic activity of PdOx/SiO2 may degrade during the methane oxidation due to the gradual transformation of PdOx to PdO in the oxygen-rich ambiance; however, such degradation is reversible and the activity of a degraded Pd/SiO2 catalyst can be recovered through a redox treatment to regain the PdOx species. This work helps to foster a better understanding of the relationship between the structure and performance of supported Pd catalysts by clarifying the state of active Pd species, which should be beneficial to the design of an active catalyst in lean methane oxidation at low temperature.

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SBA-15-supported Pd catalysts: The effect of pretreatment conditions on particle size and its application to benzyl alcohol oxidation

Cited by 45 publications

References 35 publications

Vacuum Thermal Treated Ni-CeO2/SBA-15 Catalyst for CO2 Methanation

Vacuum Thermal Treated Ni-CeO2/SBA-15 Catalyst for CO2 Methanation

Preparation of CoOx/magenium silicate for the liquid oxidation of benzyl alcohol

Preparation of Pd/SiO2 Catalysts by a Simple Dry Ball-Milling Method for Lean Methane Oxidation and Probe of the State of Active Pd Species

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