Hydrodeoxygenation of Vicinal OH Groups over Heterogeneous Rhenium Catalyst Promoted by Palladium and Ceria Support

Abstract

Heterogeneous ReO x -Pd/CeO 2 catalyst showed excellent performance for simultaneous hydrodeoxygenation of vicinal OH groups. High yield (> 99 %), turnover frequency (300 h À1 ), and turnover number (10 000) are achieved in the reaction of 1,4-anhydroerythritol to tetrahydrofuran. This catalyst can be applied to sugar alcohols, and mono-alcohols and diols are obtained in high yields (! 85 %) from substrates with even and odd numbers of OH groups, respectively. The high catalytic performance of ReO x -Pd/CeO 2 can be assigned to rhenium species with + 4 or + 5 valence state, and the formation of this species is promoted by H 2 /Pd and the ceria support.

Hydrodeoxygenation of Isoeugenol over Carbon-Supported Pt and Pt–Re Catalysts for Production of Renewable Jet Fuel

“…Bimetallic catalysts mainly studied for HDO include Mo in combination with Ni and Co, 16 which have been traditionally used for HDO processes in petroleum refining. Bimetallic catalysts containing noble metals and rhenium (RuRe/C, 17 IrRe/SiO 2 , 18,19 RePd/CeO 2 , 20 IrRe/Al 2 O 3 14 ) have shown that the presence ReOx resulted in activity elevation. While Re has been mainly studied in the context of catalytic reforming and aqueous phase reforming, the interest in rhenium has expanded to other reactions, where the oxophilic nature of the metal could improve catalytic activity.…”

Hydrothermal synthesis of bimodal mesoporous MoS2 nanosheets and their hydrodeoxygenation properties

“…In the past decade, much effort has been devoted to the preparation of a high HDO activity catalyst. [4][5][6][7][8] Several kinds of HDO catalysts have appeared, including sulphides, 7,[9][10][11] noble metals, [12][13][14] non-noble metals, [15][16][17] phosphides, 18,19 borides, 20,21 carbides 22 and ionic liquids. 23 Unfortunately, these catalysts had some disadvantages such as high cost, low activity or instability, which needed to be further improved.…”

Deoxydehydration with Molecular Hydrogen over Ceria-Supported Rhenium Catalyst with Gold Promoter

“…We have very recently reported an efficient system of simultaneous removal of vicinal hydroxyl groups such as glycerol to 1-propanol with H 2 and ReO x -Pd/CeO 2 as the reductant and a heterogeneous combination of DODH + hydrogenation. 22,23 In this catalyst, ReO x was highly dispersed in an atomic level on the surface of CeO 2 , which stabilizes the active high-valent isolated Re species. The role of Pd is to activate H 2 and to promote the reduction of Re species; however, Pd is also a very effective hydrogenation catalyst, and olefinic products were not obtained.…”