FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1994659831> ?p ?o ?g. }

• W1994659831 endingPage "302" @default.
• W1994659831 startingPage "288" @default.
• W1994659831 abstract "Two series of tungstated zirconia (WZ) solid acids covering a wide range of tungsten surface densities (δ, W at/nm2) were prepared by nonconventional impregnation and coprecipitation routes, leading to samples with enhanced surface area (∼70–120m2/g) on annealing at 973–1073 K. The materials were thoroughly characterized by N2 physisorption, XRD, Raman, XPS, H2-TPR, and DR UV–vis spectroscopy. The catalytic behavior of the Pt-promoted WZ catalysts (1 wt% Pt) was evaluated for the hydroconversion of n-hexadecane used as model feed representative of Fischer–Tropsch waxes. Both series of catalysts displayed a pronounced maximum in the reaction rate and a minimum in the selectivity to branched feed isomers (iso-C16) at an intermediate tungsten density (δmax). Interestingly, we found that δmax shifted toward higher values for coprecipitated catalysts (δmax,COP=6.8 W at/nm2) compared with the impregnated ones (δmax,IMP=5.2 W at/nm2). This has been ascribed to a better inherent capacity of the coprecipitation route for dispersing tungsten species on the ZrO2 surface, as inferred from modeled XPS data. This determines that both the formation of highly interconnected amorphous WOx domains required for the generation of catalytically active Brønsted acid sites and the onset of growth of inactive three-dimensional WO3 crystallites (ascertained by XRD and Raman) occur at higher tungsten surface densities in WZ solids generated by coprecipitation than in those obtained by impregnation. Despite the observed shift in δmax, the two most active samples within each series displayed nearly the same intrinsic activity per total W atoms, suggesting that a similar nature and size for the supported active WOx domains should be attained by both impregnation and coprecipitation routes at δ=δmax. Moreover, the method of preparation was found to affect the optical and electronic properties of the supported WOx species. Thus, coprecipitation provides WZ solids displaying a lower valence–conduction energy gap, as well as enhanced reducibility for the polytungstate domains due to an improved electronical linkage with the zirconia support, in opposition to a more isolated character of the WOx clusters generated by impregnation." @default.
• W1994659831 created "2016-06-24" @default.
• W1994659831 creator A5006843128 @default.
• W1994659831 creator A5009539565 @default.
• W1994659831 creator A5050725435 @default.
• W1994659831 creator A5073126664 @default.
• W1994659831 creator A5075216332 @default.
• W1994659831 date "2007-06-10" @default.
• W1994659831 modified "2023-10-17" @default.
• W1994659831 title "Influence of the preparative route on the properties of WOx–ZrO2 catalysts: A detailed structural, spectroscopic, and catalytic study" @default.
• W1994659831 cites W103186430 @default.
• W1994659831 cites W1513073583 @default.
• W1994659831 cites W1518993382 @default.
• W1994659831 cites W1522421280 @default.
• W1994659831 cites W1614544380 @default.
• W1994659831 cites W170366494 @default.
• W1994659831 cites W189687435 @default.
• W1994659831 cites W1965803996 @default.
• W1994659831 cites W1969370151 @default.
• W1994659831 cites W1972639008 @default.
• W1994659831 cites W1979217913 @default.
• W1994659831 cites W1983507006 @default.
• W1994659831 cites W1984191331 @default.
• W1994659831 cites W1984805770 @default.
• W1994659831 cites W1998854379 @default.
• W1994659831 cites W2000416564 @default.
• W1994659831 cites W2000636045 @default.
• W1994659831 cites W2002182535 @default.
• W1994659831 cites W2003749563 @default.
• W1994659831 cites W2013312357 @default.
• W1994659831 cites W2018051214 @default.
• W1994659831 cites W2022875999 @default.
• W1994659831 cites W2024574725 @default.
• W1994659831 cites W2028325851 @default.
• W1994659831 cites W2031078887 @default.
• W1994659831 cites W2032213355 @default.
• W1994659831 cites W2034894589 @default.
• W1994659831 cites W2039643937 @default.
• W1994659831 cites W2042313951 @default.
• W1994659831 cites W2048252827 @default.
• W1994659831 cites W2049370767 @default.
• W1994659831 cites W2050425684 @default.
• W1994659831 cites W2050524479 @default.
• W1994659831 cites W2052362958 @default.
• W1994659831 cites W2056499306 @default.
• W1994659831 cites W2058044149 @default.
• W1994659831 cites W2060721461 @default.
• W1994659831 cites W2064880169 @default.
• W1994659831 cites W2069713440 @default.
• W1994659831 cites W2070948767 @default.
• W1994659831 cites W2075112740 @default.
• W1994659831 cites W2084454696 @default.
• W1994659831 cites W2085937155 @default.
• W1994659831 cites W2090310105 @default.
• W1994659831 cites W2092628956 @default.
• W1994659831 cites W2093121101 @default.
• W1994659831 cites W2113824219 @default.
• W1994659831 cites W2124452348 @default.
• W1994659831 cites W2147027185 @default.
• W1994659831 cites W2154430427 @default.
• W1994659831 cites W2158064861 @default.
• W1994659831 cites W2168421978 @default.
• W1994659831 cites W2172108349 @default.
• W1994659831 cites W2328696867 @default.
• W1994659831 cites W2368411325 @default.
• W1994659831 cites W2586809587 @default.
• W1994659831 cites W2949233332 @default.
• W1994659831 cites W2950194524 @default.
• W1994659831 cites W378256193 @default.
• W1994659831 cites W47275430 @default.
• W1994659831 doi "https://doi.org/10.1016/j.jcat.2007.03.022" @default.
• W1994659831 hasPublicationYear "2007" @default.
• W1994659831 type Work @default.
• W1994659831 sameAs 1994659831 @default.
• W1994659831 citedByCount "99" @default.
• W1994659831 countsByYear W19946598312012 @default.
• W1994659831 countsByYear W19946598312013 @default.
• W1994659831 countsByYear W19946598312014 @default.
• W1994659831 countsByYear W19946598312015 @default.
• W1994659831 countsByYear W19946598312016 @default.
• W1994659831 countsByYear W19946598312017 @default.
• W1994659831 countsByYear W19946598312018 @default.
• W1994659831 countsByYear W19946598312019 @default.
• W1994659831 countsByYear W19946598312020 @default.
• W1994659831 countsByYear W19946598312021 @default.
• W1994659831 countsByYear W19946598312022 @default.
• W1994659831 countsByYear W19946598312023 @default.
• W1994659831 crossrefType "journal-article" @default.
• W1994659831 hasAuthorship W1994659831A5006843128 @default.
• W1994659831 hasAuthorship W1994659831A5009539565 @default.
• W1994659831 hasAuthorship W1994659831A5050725435 @default.
• W1994659831 hasAuthorship W1994659831A5073126664 @default.
• W1994659831 hasAuthorship W1994659831A5075216332 @default.
• W1994659831 hasConcept C120665830 @default.
• W1994659831 hasConcept C121332964 @default.
• W1994659831 hasConcept C127413603 @default.
• W1994659831 hasConcept C137637335 @default.
• W1994659831 hasConcept C161790260 @default.

• next