Effect of speed rotation on the compressive strength of horizontal mixer for cellular lightweight concrete
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Author list: Chapirom A., Sinsiri T., Jaturapitakkul C., Chindaprasirt P.
Publisher: Elsevier
Publication year: 2019
Journal: Applied Catalysis A: General (0926-860X)
Volume number: 26
Issue number: 2
Start page: 113
End page: 120
Number of pages: 8
ISSN: 0926-860X
eISSN: 1873-3875
Languages: English-Great Britain (EN-GB)
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Abstract
Lignin is a potential renewable feedstock for aromatic compounds. Lignin glues cellulose and hemicellulose together in a rigid structure that protects plants from weather, insects, and disease. This rigidity also poses a barrier to cleavage of lignin into aromatic compounds. Typically, lignin is depolymerized by metal-catalyzed hydrogenolysis of its β-O-4 aryl ether (Cβ-O) bonds; this process requires high H2 pressure. Here, we show that the abundant aliphatic hydroxyl groups (Cα-OH) in lignin structure, can serve as the hydrogen source in Ru-catalyzed hydrogenolysis of the Cβ-O bonds. We pretreated the Ru/C catalyst under reducing and oxidizing conditions to generate various Ru/RuO2 ratios. Then we investigated the effects of Ru and RuO2 on hydrogenolysis of the Cβ-O bonds of lignin model compounds. We used X-ray diffraction (XRD) and H2 Temperature-programmed reduction (TPR) to determine changes of grain size and Ru content of the Ru/C catalysts, respectively. Our results revealed that Ru/C catalyzed hydrogenolysis of β-O-4 aryl ether bonds with internal hydrogen (self-hydrogen) as a hydrogen source. The elimination of external H2 in lignin hydrogenolysis is an efficient approach for lignin conversion to valuable aromatic chemicals. © 2019 Elsevier B.V.
Keywords
Hydrogenolysis, Hydrogen transfer, Ruthenium, Self-hydrogen
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