Infrared study of the adsorption and mechanism of surface reactions of 1-propanol on .gamma.-alumina and .gamma.-alumina doped with sodium hydroxide and chromium oxide

Deo, A. V.; Lana, I. G. Dalla

doi:10.1021/j100723a038

Cited by 51 publications

(18 citation statements)

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“…It was reported that the formation of hydroxyl compounds easily occurs on the surface of Pd/Al 2 O 3 due to its hydrophilic nature. The complete removal of the surface hydration requires temperatures as high as 900 °C under atmospheric pressure. , …”

Section: Resultsmentioning

confidence: 99%

“…The complete removal of the surface hydration requires temperatures as high as 900 °C under atmospheric pressure. 35,36 Table 1 also shows the textural properties of pristine, watersoaked, and sulfur-treated Pd/SOMS. The BET surface area, BJH pore volume, and BJH pore diameter of pristine Pd/ SOMS were found to be 590 m 2 /g, 0.73 cm 3 /g, and 3.9 nm, respectively.…”

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

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Aqueous-Phase Hydrodechlorination of Trichloroethylene over Pd-Based Swellable Organically Modified Silica: Catalyst Deactivation Due to Sulfur Species

Çelik

Ailawar

Gündüz

et al. 2019

Ind. Eng. Chem. Res.

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One of the problems of catalytic water treatment systems is that sulfur-containing species present in contaminated water have a detrimental effect on the catalytic performance because of strong interactions of sulfur species with active metal sites. In order to address these problems, our research has focused on developing a poison-resistant catalytic system by using a novel material, namely, swellable organically modified silica (SOMS), as a catalyst scaffold. Our previous investigations demonstrated that the developed system was resistant to chloride poisoning, active metal leaching, and carbon deposition under reaction conditions. This study examines the sulfur tolerance of the developed catalytic system for hydrodechlorination (HDC) of trichloroethylene (TCE) by subjecting Pd-incorporated samples to different sulfur species, including sulfates (SO 4 2− ), bisulfides (HS − ), and hydrogen sulfide (H 2 S). The pristine and sulfur-treated catalysts were then tested for aqueous-and gas-phase HDC of TCE and characterized by several techniques, including N 2 physisorption, X-ray photoelectron spectroscopy (XPS), extended X-ray absorption fine structure spectroscopy (EXAFS), and temperatureprogrammed reaction (TP rxn ) with H 2 . The investigations were also performed on Pd/Al 2 O 3 , a commercially used HDC catalyst, to have a basis for comparison. The activity and characterization results revealed that Pd/Al 2 O 3 underwent deactivation due to exposure to sulfur-containing compounds. Pd/SOMS, however, exhibited better resistance to aqueous sulfates, bisulfides, and gas-phase H 2 S. In addition, the removal of sulfur species from completely poisoned catalysts was found to be more facile in Pd/SOMS than Pd/Al 2 O 3 . The tolerance of Pd/SOMS to sulfur poisoning was attributed to stem from the novel characteristics of SOMS, such as swelling ability and extreme hydrophobicity.

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Section: Resultsmentioning

confidence: 99%

Section: Industrial and Engineering Chemistry Researchmentioning

confidence: 99%

Aqueous-Phase Hydrodechlorination of Trichloroethylene over Pd-Based Swellable Organically Modified Silica: Catalyst Deactivation Due to Sulfur Species

Çelik

Ailawar

Gündüz

et al. 2019

Ind. Eng. Chem. Res.

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“…In flash desorption28•6 an adsorbate is allowed to accumulate to a desired coverage n0 on the surface maintained at a temperature T0, and then the desorption rate parameters are determined by measuring the amount desorbed as a function of time by programming the surface temperature to vary approximately as T -To 4ft where ß is a constant. The desorption rate from, a single state is given by the expression = vo{m)e-F-*>'RTnm (1) df where r0(m) is the preexponential factor for desorption with order m, and Ed is the activation energy of desorption. For high pumping speeds one obtains a peak for each binding state, and by analysis of the position and shape of these peaks the parameters vB, Ed, to, and n0 for each state can be obtained.…”

Section: Methodsmentioning

confidence: 99%

Binding states of hydrogen and of nitrogen on the (100) plane of molybdenum

Han¹,

Schmidt²

1971

J. Phys. Chem.

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The binding states and desorption kinetics of hydrogen and nitrogen on the (100) plane of Mo are examined by flash desorption mass spectrometry, and the results are compared with the adsorption of these gases on (100) W. Since molybdenum and tungsten are isoelectronic and have the same crystal structure and lattice constant, differences must be attributed to differences in the electronic properties of the substrates. It is found that, while there is a good correlation between the binding states of these gases and between the binding states of each gas on the substrates, there are several interesting differences. There is an extra binding state observed for hydrogen on (100)Mo which is not observed on (100)W. It is suggested that this state may also exist on (100)W but not be observed in flash desorption. It is also found that there are significant differences between the binding energies on the substrates. Hydrogen is much more strongly bound on W while nitrogen is more strongly bound on Mo. The difference in hydrogen adsorption is interpreted in terms of the greater bonding capabilities of the 5d vs. 4d electrons of the substrates, while the strength of the nitrogen adsorption bond on Mo is attributed to the lateral interaction in the plane of the substrates which should be stronger for Mo than for W.(1) This work partially supported by ARPA under Grant DAHC15-69-G6.(2) (a)

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“…Despite the fact that the surface species formed by other product species, such as 1-PO, 2-PO or ethanol, also exhibit (CH 3 ) and (CH 2 ) bands with nearly identical frequencies [38][39][40], it is reasonable to think that they could correspond to 1,2-PDO, since it is the major product in the reaction (30.6 and 36.1% selectivity for the experiments with 15 and 30 wt% initial glycerol concentrations). In addition, the higher number of OH groups of 1,2-PDO makes its adsorption on the catalyst surface easier [37], as it was explained above.…”

Section: In-situ Atr-ir Studies Of Glycerol Hydrogenolysismentioning

confidence: 99%

The role of tungsten oxide in the selective hydrogenolysis of glycerol to 1,3-propanediol over Pt/WOx/Al2O3

García-Fernández

Gandarias

Requies

et al. 2017

Applied Catalysis B: Environmental

127

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Infrared study of the adsorption and mechanism of surface reactions of 1-propanol on .gamma.-alumina and .gamma.-alumina doped with sodium hydroxide and chromium oxide

Cited by 51 publications

References 0 publications

Aqueous-Phase Hydrodechlorination of Trichloroethylene over Pd-Based Swellable Organically Modified Silica: Catalyst Deactivation Due to Sulfur Species

Aqueous-Phase Hydrodechlorination of Trichloroethylene over Pd-Based Swellable Organically Modified Silica: Catalyst Deactivation Due to Sulfur Species

Binding states of hydrogen and of nitrogen on the (100) plane of molybdenum

The role of tungsten oxide in the selective hydrogenolysis of glycerol to 1,3-propanediol over Pt/WOx/Al2O3

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