glycerol hydrogenolysis
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Catalysts ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 72
Author(s):  
Giuseppina Luciani ◽  
Giovanna Ruoppolo ◽  
Gianluca Landi ◽  
Valentina Gargiulo ◽  
Michela Alfè ◽  
...  

Glycerol is the main by-product of biodiesel production; its upgrading to more valuable products is a demanding issue. Hydrogenolysis to 1,2-propanediol is one of the most interesting processes among the possible upgrading routes. In this study, we propose novel copper/zirconia catalysts prepared by advanced preparation methods, including copper deposition via metal–organic framework (MOF) and support preparation via the sol–gel route. The catalysts were characterized by N2 physisorption, X-ray diffraction, Scanning Electron Microscopy, H2-TPR and NH3-TPD analyses and tested in a commercial batch reactor. The catalyst prepared by copper deposition via MOF decomposition onto commercial zirconia showed the best catalytic performance, reaching 75% yield. The improved catalytic performance was assigned to a proper combination of redox and acid properties. In particular, a non-negligible fraction of cuprous oxide and of weak acid sites seems fundamental to preferentially activate the selective pathway. In particular, these features avoid the overhydrogenolysis of 1,2-propanediol to 1-propanol and enhance glycerol dehydration to hydroxyacetone and the successive hydrogenation of hydroxyacetone to 1,2-propanediol.


Catalysts ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1171
Author(s):  
Clara Jarauta-Córdoba ◽  
Mikel Oregui Bengoechea ◽  
Iker Agirrezabal-Telleria ◽  
Pedro-Luis Arias ◽  
Inaki Gandarias

The chemo-selective hydrogenolysis of secondary hydroxyls is an important reaction for the production of biomass-derived α,ω-diols. This is the case for 1,3-propanediol production from glycerol. Supported Pt-WOx materials are effective catalysts for this transformation, and their activity is often related to the tungsten surface density and Brönsted acidity, although there are discrepancies in this regard. In this work, a series of Pt-WOx/γ-Al2O3 catalysts were prepared by modifying the pH of the solutions used in the active metal impregnation step. The activity–structure relationships, together with the results from the addition of in situ titrants, i.e., 2,6-di-tert-butyl-pyridine or pyridine, helped in elucidating the nature of the bifunctional active sites for the selective production of 1,3-propanediol.


2021 ◽  
pp. 118359
Author(s):  
Ana Luiza P. Salgado ◽  
Felipe C. Araújo ◽  
André V.H. Soares ◽  
Yutao Xing ◽  
Fabio B. Passos

Author(s):  
Xin Ren ◽  
Li Leng ◽  
Yueqiang Cao ◽  
Jing Zhang ◽  
Xuezhi Duan ◽  
...  

ChemCatChem ◽  
2021 ◽  
Author(s):  
Binbin Zhao ◽  
Yu Liang ◽  
Lei Liu ◽  
Qian He ◽  
Jinxiang Dong

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1565
Author(s):  
Alexander A. Greish ◽  
Elena D. Finashina ◽  
Olga P. Tkachenko ◽  
Leonid M. Kustov

The paper presents the results obtained in studying glycerol hydrogenolysis into 1-propanol and 2-propanol over bifunctional Ni/WO3-TiO2 and Ni/WO3-ZrO2 catalysts in the flow system. Due to the optimal combination of acidic and hydrogenation properties of the heterogeneous catalysts, they exhibit higher performance in glycerol conversion into C3 alcohols, although the process is carried out in rather mild conditions. At the reaction temperature of 250 °C and hydrogen pressure of 3 MPa, the total yield of 1-propanol and 2-propanol reaches 95%, and the glycerol conversion is close to 100%.


Author(s):  
Norsahida Azri ◽  
Ramli Irmawati ◽  
Usman Idris Nda-Umar ◽  
Mohd Izham Saiman ◽  
Yun Hin Taufiq-Yap

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