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promoter effect on the CO_2-H_2O formation during Fischer-Tropsch synthesis on iron-based catalysts

Journal of Natural Gas Chemistry 2010年第2期19卷 193-197页

作者： Ali Nakhaei Pour Seyed Mehdi Kamali Shahri Yahya Zamani Akbar Zamanian Research Institute of Petroleum Industry (RIPI) of National Iranian Oil Company Gas Research DivisionP.O.Box 14665-137TehranIran

The effects of Mg,La and ca promoters on primary and secondary CO2 and H2O formation pathways during Fischer-Tropsch synthesis on precipitated Fe/Cu/SiO2 catalysts are *** chemisorbed oxygen atoms in the primary pathway formed in the CO dissociation steps reacted with co-adsorbed hydrogen or carbon monoxide to produce H2O and CO2,*** secondary pathway was the water-gas shift *** results indicated that the CO2 production led to an increase in both primary and secondary pathways,and H2O production decreased when surface basicity of the catalyst increased in the order ca 〉 Mg 〉 La.

关键词： ca promoter Mg promoter La promoter Fischer-Tropsch synthesis iron-based catalyst water-gas shift reaction

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Significant effect of ca modification on improving catalytic stability of Cu-catalyst in gas-phase furfural hydrogenation to furfuralcohol

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Resources Chemicals and Materials 2023年第4期2卷 321-330页

作者： Chao Wang Jiarui He Mengjuan Zhang Peng Zheng Guoguo Liu Yajing Zhang Zhennan Han Jing Wu Kangjun Wang College of Chemical Engineering Shenyang University of Chemical TechnologyShenyang 110142China Key Laboratory of Resources Chemicals and Materials(Shenyang University of Chemical Technology) Ministry of EducationShenyang 110142China

The gas-phase hydrogenation of furfural to furfuralcohol over Cr-free Cu-based catalysts has attracted increasing attention due to its environmentally friendly nature and mild operating *** reduced pure nano-sized CuO exhibits complete furfural hydrogenation and nearly 100%furfuralcohol selectivity,it suffers from rapid deactivation caused by *** this study,we conducted comparative investigations on the catalytic performance and stability of two Cu-based catalysts:90%CuO-10%SiO_(2) and 90%CuO-5%caO-5%SiO_(2),in the gas-phase furfural *** reaction is carried out under various conditions,including temperatures ranging from 120 to 170℃,LHSVs of 1 to 2.2 h^(-1),and H_(2) to furfural molar ratios of 3.5 to *** results indicate that under optimal conditions,the ca-modified catalyst achieves nearly complete furfural conversion and almost 100%furfuralcohol selectivity for a test duration of 31 *** contrast,the unmodified catalyst exhibits stable performance for only seven hours despite the similar initial *** analysis confirms that the gradual deactivation of both catalysts is attributed to the oxidation of reduced metallic Cu sites to Cu *** characterizations of the two spent catalysts using HRTEM and XPS analyses,along with DFT calculations,suggest that the presence of ca in Cu lattices prevents the loss of electrons from low-valence Cu sites or the reduced metallic Cu sites,thus inhibiting their oxidation to high-valence Cu *** phenomenon contributes to suppressing the deactivation of Cu-catalysts in the gas-phase furfural hydrogenation process.

关键词： Gas-phase furfural catalytic hydrogenation Furfuralcohol Deactivation mechanism ca promoter

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