Catalytic hydrodechlorination over Pd supported on amorphous and structured carbon

Amorim, Cláudia; Yuan, Gang; Patterson, Patricia M.; Keane, Mark A.

doi:10.1016/j.jcat.2005.06.019

Cited by 139 publications

(84 citation statements)

References 85 publications

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“…Drawing on available literature, the lower temperature peak can be ascribed to loss of chemisorbed hydrogen from Pd. 41 This is consistent with the equivalence of H 2 desorbed over 720 -980 K (6 mmol g 21 ) and that chemisorbed (Table 1).…”

Section: Thermodynamic Analysissupporting

confidence: 86%

Production of Butylamine in the Gas Phase Hydrogenation of Butyronitrile over Pd/SiO₂ and Ba-Pd/SiO₂

Hao

Cárdenas‐Lizana

et al. 2015

Catalysis, Structure & Reactivity

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The gas phase (1 atm, 473 -563 K) hydrogenation of butyronitrile has been studied over Pd/SiO 2 and Ba -Pd/SiO 2 . Catalysts characterization involved temperature-programmed reduction (TPR), H 2 /NH 3 chemisorption/temperature programmed desorption (TPD), X-ray diffraction (XRD), and TEM measurements. The incorporation of Ba with Pd resulted in the formation of smaller metal nano-particles (7 vs 28 nm) with a resultant (seven-fold) higher H 2 chemisorption and decreased total surface acidity (from NH 3 chemisorption/TPD).Temperature-related activity maxima were observed for both catalysts and are associated with thermal desorption of the nitrile reactant. Exclusivity to the target butylamine was achieved at T $ 543 K where Ba -Pd/SiO 2 delivered higher selective hydrogenation rate (91 mol h 21 mol Pd 21) than Pd/SiO 2 (54 mol h 21 mol Pd 21 ), attributed to greater availability of surface-reactive hydrogen. Lower surface acidity served to minimize condensation to higher amines. The rate and selectivity to butylamine exceed those previously reported for gas phase operation.

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Section: Thermodynamic Analysissupporting

confidence: 86%

Production of Butylamine in the Gas Phase Hydrogenation of Butyronitrile over Pd/SiO₂ and Ba-Pd/SiO₂

Hao

Cárdenas‐Lizana

et al. 2015

Catalysis, Structure & Reactivity

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“…Nanoporous carbon materials, including activated carbons and carbon fi bers, have also been considered as adsorbents for CO 2 , because of their hydrophobic nature and high surface area; [ 98 ] both properties make them suitable for CCS purpose. Moreover, many carbon materials are light in weight and relatively cheap to manufacture (except carbon nanotubes).…”

Section: Carbon Nanotubes and Ordered Mesoporous Carbonmentioning

confidence: 99%

The Potential Applications of Nanoporous Materials for the Adsorption, Separation, and Catalytic Conversion of Carbon Dioxide

Sneddon

Greenaway

Yiu

2014

Advanced Energy Materials

180

104

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Carbon capture and storage (CCS) technologies aiming at tackling CO2 emission have attracted much attention from scientists of various backgrounds. Most CCS systems require an efficient adsorbent to remove CO2 from sources such as fossil fuels (pre‐combustion) or flue gas from power generation (post‐combustion). Research on developing efficient adsorbents with a substantial capacity, good stability and recyclability has grown rapidly in the past decade. Because of their high surface area, highly porous structure, and high stability, various nanoporous materials have been viewed as good candidates for this challenging task. Here, recent developments in several classes of nanoporous materials, such as zeolites, metal organic frameworks (MOFs), mesoporous silicas, carbon nanotubes, and organic cage frameworks, for CCS are examined and potential future directions for CCS technology are discussed. The main criteria for a sustainable CO2 adsorbent for industrial use are also rationalized. Moreover, catalytic transformations of CO2 to other chemical species using nanoporous catalysts and their potential for large scale carbon capture and utilization (CCU) processes are also discussed. Application of CCU technologies avoids any potential hazard associated with CO2 reservoirs and allows possible recovery of some running cost for CO2 capture by manufacturing valuable chemicals.

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“…XRD spectra of the carbon fiber electrode and the prepared Pd/C electrode were given in Figure S3. The peak at 26.5 • is attributed to the highly structured (graphitic) carbon, and the diffraction peaks occurring at 40.2 • and 46.8 • are assigned to typical Pd metal with face centered cubic crystallographic structure [34,35]. The peaks at 68.3 • and 82.3 • are respectively for (220) and (311) planes, indicating the polycrystalline state of Pd particles electrodeposited onto the carbon fiber.…”

Section: Characterization Of the Pd/c Electrodementioning

confidence: 99%

Electrochemical Reduction of Bromate by a Pd Modified Carbon Fiber Electrode: Kinetics and Mechanism

Mao

Zhao

2014

Electrochimica Acta

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a b s t r a c tThe electroreduction of bromate (BrO 3 − ) was investigated at a Pd modified carbon fiber (Pd/C) electrode prepared from PdCl 2 via electrodeposition method. Pd particles distributed on the carbon fiber substrate uniformly. Under various cathode potentials, electroreduction removal of BrO 3 − at pure carbon fiber electrode and the Pd/C electrode were firstly compared. It was observed that nearly no BrO 3 − removal was observed within the bias potential of -2.0 V at the carbon fiber electrode. At the Pd/C electrode, the removal efficiency of BrO 3 − was sharply increased from 24.0% to 58.4% at the cathode potential of -1.0 to -1.5 V, which was further increased to be 87.2% at -2.0 V. The electrochemical reduction of BrO 3 − was strongly pH-dependent at -0.5 V and the reduction rate could be enhanced at low pH. While at the potential of -2.0 V, a slight pH effect was observed. BrO 3 − electroreduction follows pseudo first-order kinetics; the rate constant k was firstly increased from 0.016 to 0.031 min −1 with the increase of the Pd loading amount from 0.31 to 0.73 mg/cm 2 , and then was decreased to 0.018 min −1 at a higher Pd loading amount of 1.05 mg/cm 2 . The Pd(0) nanoparticles played a significant role in forming atomic H* to realize indirect BrO 3 − reduction. The electrochemical reduction of BrO 3 − produces accumulated intermediates of HOBr and OBr − , which were subsequently reduced to Br − with the time evolution.

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Catalytic hydrodechlorination over Pd supported on amorphous and structured carbon

Cited by 139 publications

References 85 publications

Production of Butylamine in the Gas Phase Hydrogenation of Butyronitrile over Pd/SiO₂ and Ba-Pd/SiO₂

Production of Butylamine in the Gas Phase Hydrogenation of Butyronitrile over Pd/SiO₂ and Ba-Pd/SiO₂

The Potential Applications of Nanoporous Materials for the Adsorption, Separation, and Catalytic Conversion of Carbon Dioxide

Electrochemical Reduction of Bromate by a Pd Modified Carbon Fiber Electrode: Kinetics and Mechanism

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Catalytic hydrodechlorination over Pd supported on amorphous and structured carbon

Cited by 139 publications

References 85 publications

Production of Butylamine in the Gas Phase Hydrogenation of Butyronitrile over Pd/SiO2 and Ba-Pd/SiO2

Production of Butylamine in the Gas Phase Hydrogenation of Butyronitrile over Pd/SiO2 and Ba-Pd/SiO2

The Potential Applications of Nanoporous Materials for the Adsorption, Separation, and Catalytic Conversion of Carbon Dioxide

Electrochemical Reduction of Bromate by a Pd Modified Carbon Fiber Electrode: Kinetics and Mechanism

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Product

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Production of Butylamine in the Gas Phase Hydrogenation of Butyronitrile over Pd/SiO₂ and Ba-Pd/SiO₂

Production of Butylamine in the Gas Phase Hydrogenation of Butyronitrile over Pd/SiO₂ and Ba-Pd/SiO₂