Temperature programmed reduction of silica supported nickel catalysts

1993 ◽  
Vol 271 (11) ◽  
pp. 1100-1105 ◽  
Author(s):  
M. Afzal ◽  
C. R. Theocharis ◽  
S. Karim
Keyword(s):  
Nickel Catalysts ◽  
Temperature Programmed Reduction ◽  
Supported Nickel Catalysts ◽  
Temperature Programmed

scholarly journals Nickel-Catalysed Vapour-Phase Hydrogenation of Furfural, Insights into Reactivity and Deactivation

2020 ◽  
Vol 63 (15-18) ◽  
pp. 1446-1462 ◽  
Author(s):  
Kathryn L. MacIntosh ◽  
Simon K. Beaumont
Keyword(s):  
Furfuryl Alcohol ◽  
Copper Chromite ◽  
Catalyst Support ◽  
Nickel Catalysts ◽  
Vapour Phase ◽  
X Ray Diffraction ◽  
Temperature Programmed Oxidation ◽  
Acidic Sites ◽  
Supported Nickel Catalysts ◽  
Temperature Programmed

AbstractFurfural is a key bioderived platform molecule, and its hydrogenation affords access to a number of important chemical intermediates that can act as “drop-in” replacements to those derived from crude oil or novel alternatives with desirable properties. Here, the vapour phase hydrogenation of furfural to furfuryl alcohol at 180 °C over standard impregnated nickel catalysts is reported and contrasted with the same reaction over copper chromite. Whilst the selectivity to furfuryl alcohol of the unmodified nickel catalysts is much lower than for copper chromite as expected, the activity of the nickel catalysts in the vapour phase is significantly higher, and the deactivation profile remarkably similar. In the case of the supported nickel catalysts, possible contribution to the deactivation by acidic sites on the catalyst support is discounted based on the similarity of deactivation kinetics on Ni/SiO2 with those seen for less acidic Ni/TiO2 and Ni/CeO2. Powder X-ray diffraction is used to exclude sintering as a primary deactivation pathway. Significant coking of the catalyst (~ 30 wt% over 16 h) is observed using temperature programmed oxidation. This, in combination with the solvent extraction analysis and infrared spectroscopy of the coked catalysts points to deactivation by polymeric condensation products of (reactant or) products and hydrocarbon like coke. These findings pave the way for targeted modification of nickel catalysts to use for this important biofeedstock-to-chemicals transformation.

Temperature programmed reduction studies of nonpyrophoric Raney nickel catalysts

1989 ◽  
Vol 38 (1) ◽  
pp. 181-185
Author(s):  
A. B. Fasman ◽  
S. D. Mikhailenko ◽  
E. V. Leongard ◽  
T. A. Khodareva ◽  
A. I. Lyashenko
Keyword(s):  
Raney Nickel ◽  
Nickel Catalysts ◽  
Temperature Programmed Reduction ◽  
Temperature Programmed

Temperature-programmed reduction of silica-supported platinum/nickel catalysts studied by XANES

1992 ◽  
Vol 96 (3) ◽  
pp. 1324-1328 ◽  
Author(s):  
Andreas Jentys ◽  
Brian J. McHugh ◽  
Gary L. Haller ◽  
Johannes A. Lercher
Keyword(s):  
Nickel Catalysts ◽  
Temperature Programmed Reduction ◽  
Supported Platinum ◽  
Temperature Programmed

scholarly journals Tuning Selectivity of Maleic Anhydride Hydrogenation Reaction over Ni/Sc-Doped ZrO2 Catalysts

Catalysts ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 366 ◽  
Author(s):  
Lili Zhao ◽  
Yin Zhang ◽  
Tianjie Wu ◽  
Min Zhao ◽  
Yongzhao Wang ◽  
...  
Keyword(s):  
Maleic Anhydride ◽  
Surface Structure ◽  
Selective Hydrogenation ◽  
Succinic Anhydride ◽  
Nickel Catalysts ◽  
Impregnation Method ◽  
Hydrogenation Activity ◽  
Supported Nickel Catalysts ◽  
Zro2 Catalyst ◽  
Temperature Programmed

A series of Sc-doped ZrO2 supports, with Sc2O3 content in the range of 0 to 7.5% (mol/mol), were prepared using the hydrothermal method. Ni/Sc-doped ZrO2 catalysts with nickel loading of 10% (w/w) were prepared using impregnation method, and characterized with the use of XRD, Raman, H2 temperature-programmed reduction (H2-TPR), H2 temperature-programmed desorption (H2-TPD), XPS, and in situ FT-IR techniques. The catalytic performances of Ni/Sc-doped ZrO2 catalysts in maleic anhydride hydrogenation were tested. The results showed that the introduction of Sc3+ into ZrO2 support could effectively manipulate the distribution of maleic anhydride hydrogenation products. γ-butyrolactone was the major hydrogenation product over Sc-free Ni/ZrO2 catalyst with selectivity as high as 65.8% at 210 °C and 5 MPa of H2 pressure. The Ni/Sc-doped ZrO2 catalyst, with 7.5 mol% of Sc2O3 content, selectively catalyzed maleic anhydride hydrogenation to succinic anhydride, the selectivity towards succinic anhydride was up to 97.6% under the same reaction condition. The results of the catalysts’ structure–activity relationships revealed that there was an interdependence between the surface structure of ZrO2-based support and the C=O hydrogenation performance of the ZrO2-based supported nickel catalysts. By controlling the Sc2O3 content, the surface structure of ZrO2-based support could be regulated effectively. The different surface structure of ZrO2-based supports, resulted in the different degree of interaction between the nickel species and ZrO2-based supports; furthermore, the different interaction led to the different surface oxygen vacancies electron properties of ZrO2-based supported nickel catalysts and the C=O hydrogenation activity of the catalyst. This result provides new insight into the effect of ZrO2 support on the selective hydrogenation activity of ZrO2-supported metal catalysts and contributes to the design of selective hydrogenation catalysts for other unsaturated carbonyl compounds.

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