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²¹³äÉÏÎÄÏ× ********* Geboers, J., et al. (2010). "Efficient catalytic conversion of concentrated cellulose feeds to hexitols with heteropoly acids and Ru on carbon." Chemical Communications 46(20): 3577-3579. A combination of heteropolyacids and Ru on carbon catalyzes the conversion of concentrated cellulose feeds into hexitols under H-2 pressure. Quantitative conversion of ball-milled cellulose was observed with remarkable hexitol volume productivity. ********* Geboers, J., et al. (2011). "Efficient hydrolytic hydrogenation of cellulose in the presence of Ru-loaded zeolites and trace amounts of mineral acid." Chemical Communications 47(19): 5590-5592. The hydrolytic hydrogenation of cellulose in the presence of Ru-loaded zeolites and trace amounts of mineral acid shows excellent yields (>90%) for hexitols ******** Palkovits, R., et al. (2011). "Heteropoly acids as efficient acid catalysts in the one-step conversion of cellulose to sugar alcohols." Chemical Communications 47(1): 576-578. Cellulose and even spruce can be converted efficiently into valuable platform chemicals via combined hydrolysis and hydrogenation in the aqueous phase. Thereby, heteropoly acids together with supported ruthenium catalysts show not only high activity but also remarkable selectivity to sugar alcohols reaching up to 81% yield of C(4) to C(6) sugar alcohols in only 7 h at 160 degrees C. ********** Palkovits, R., et al. (2010). "Hydrogenolysis of cellulose combining mineral acids and hydrogenation catalysts." Green Chemistry 12(6): 972-978. A catalytic system capable of reaching high performance in the hydrogenolysis of cellulose at low reaction temperature and short reaction times has been developed. Therefore, supported noble metal catalysts based on Pt, Pd and Ru have been combined with dilute mineral acids. A broad variable set in terms of type of noble metal, type of acid, acid concentration and reaction time could be evaluated based on chemical interpretation and supported by a Design of Experiment (DoE) approach. The variables significantly influenced conversion of cellulose, product range and selectivity towards sugar alcohol formation. Thus, at 160 degrees C, above 60% yield in sugars and sugar alcohols with 84% selectivity at a cellulose conversion of 72% could be reached. Besides, glycerol, propylene glycol, ethylene glycol and methanol were formed as additional valuable by-products leading to an overall carbon utilization above 89%. Furthermore, the concept was successfully transferred to real feedstocks in the form of spruce reaching close to 60% conversion in only one hour reaction time. ************ ľÖÊËØ¼ÓÇâÍÑÑõ Zhao, C., et al. (2009). "Highly Selective Catalytic Conversion of Phenolic Bio-Oil to Alkanes." Angewandte Chemie 121(22): 4047-4050. Abstract 10.1002/ange.200900404.abs Öl und Wasser: Eine neue energieeffiziente und atomökonomische katalytische Produktion von Alkanen und Methanol durch Veredelung der phenolischen Fraktion von Bioöl wird vorgestellt. Der in wässriger Phase durchgef¨¹hrte Eintopf-Hydrodesoxygenierungsprozess nutzt zwei Katalysatoren, was die Teilreaktionen Hydrierung, Hydrolyse und Dehydratisierung erleichtert. |
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