Applied Catalysis A: General p. 47 - 53 (2019)
Update date:2022-08-11
Topics:
Gabrysch, Thomas
Muhler, Martin
Peng, Baoxiang
The kinetics of glycerol hydrodeoxygenation to 1,2-propanediol via the selective cleavage of the primary C-O bond was systematically studied in the aqueous phase over a co-precipitated Cu/ZrO2 catalyst. Unsupported pure metallic Cu was used as reference catalyst. Batch experiments were performed in an autoclave by varying the reaction temperature (175–225 °C), H2 partial pressure (25–35 bar) and initial glycerol concentration (2–8 wt%). The Cu/ZrO2 catalyst was found to be highly selective to 1,2propanediol (up to 95%), and ethylene glycol was obtained as major by-product from parallel C–]C bond hydrogenolysis. The apparent activation energies amounting to 106 and 105 kJ mol-1 for Cu/ZrO2 and pure metallic Cu, respectively, of the hydrodeoxygenation pathway provide further evidence for metallic Cu acting as the active site. Kinetic analysis of the rate of glycerol consumption yielded a zero-order dependence on the concentration of glycerol suggesting an essentially almost full coverage of adsorbed glycerol as most strongly bound organic adsorbate. In contrast, a first-order dependence on hydrogen concentration was observed. Hydrogen is assumed to be not only required for the fast hydrogenation of the intermediate acetol, but also for the removal of adsorbed atomic oxygen originating from water dissociation to create empty sites for dissociative glycerol adsorption. Thus, the active Cu sites are assumed to be fully adsorbate-covered under reaction conditions.
View MorePengchen New Material Technology Co., Ltd.
Contact:+86-512-63680537
Address:99.6 km of national road 318, Meiyan Community,Pingwang Town, Wujiang District, Suzhou 215225
Shanghai Sharing technologies Co., Ltd.
Contact:86-021-66787223
Address:No11, Lane 225, Jinxiang Road,Pudong district
Contact:+86-575-82733999 0575-82732999
Address:hangzhou gulf fine chemical zone,shangyu city,zhejiang province
Sichuan Highlight Fine Chemicals Co., Ltd.
Contact:+86-28-8525 1605
Address:A5-102 Airport base,388 West Airport Huang He Zhong Lu,2 Section
Chengdu D-Innovation Pharmaceutical Co., Ltd
Contact:86-28-85105536
Address:1001, B6, No.88 Keyuan South Road, Chengdu Hi-Tech Zone
Doi:10.1021/es981045r
(1999)Doi:10.1039/c6ra02415g
(2016)Doi:10.1021/ja02213a003
(1912)Doi:10.1021/acs.joc.7b02688
(2018)Doi:10.1039/c3cy00717k
(2014)Doi:10.1021/ja00371a045
(1982)