The Ru/C catalyst prepared by impregnation method was used for hydrogenation of 3,5-dimethylpyridine in a trickle bed reactor.Under the same reduction conditions(300℃in H2),the catalytic activity of the non-in-situ reduced Ru/C-n catalyst was higher than that of the in-situ reduced Ru/C-y catalyst.Therefore,an in-situ H2 reduction and moderate oxidation method was developed to increase the catalyst activity.Moreover,the influence of oxidation temperature on the developed method was investigated.The catalysts were characterized by Brunauer-Emmett-Teller method,hydrogen tempera-ture programmed reduction H2-TPR,hydrogen temperature-programmed dispersion(H2-TPD),X-ray diffraction,energy dispersive spectroscopy,X-ray photoelectron spectroscopy,Raman spectroscopy,O2 chemisorption and oxygen temperature-programmed dispersion(O2-TPD)analyses.The results showed that there existed an optimal Ru/RuOx ratio for the catalyst,and the highest 3,5-dimethylpyridine conversion was obtained for the Ru/C-i1 catalyst prepared by in-situ H2 reduction and moderate oxidation(oxidized at 100℃).Excessive oxidation(200℃)resulted in a significant decrease in the Ru/RuOx ratio of the in-situ H2 reduction and moderate oxidized Ru/C-i2 catalyst,the interaction between RuOx species and the support changed,and the hard-to-reduce RuOx species was formed,leading to a significant decrease in catalyst activity.The developed in-situ H2 reduction and moderate oxidation method eliminated the step of the non-in-situ reduction of catalyst outside the trickle bed reactor.

Tao Lin;Xiaoxun Ma

School of Chemical Engineering,Northwest University,Xi'an 710069,China;Kaili Catalyst&New Materials Co.,Ltd.Xi'an 710201,China;Shaanxi Key Laboratory of Catalytic Materials and Technology,Xi'an 710201,China;Chemical Engineering Research Center of the Ministry of Education(MOE)for Advanced Use Technology of Shanbei Energy,Xi'an 710069,China;Shaanxi Research Center of Engineering Technology for Clean Coal Conversion,Xi'an 710069,China;Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi,Xi'an 710069,China;International Scientific and Technological Cooperation Base of the Ministry of Science and Technology(MOST)for Clean Utilization of Hydrocarbon Resources,Xi'an 710069,China

化学科学与工程前沿

[1]Tao Lin;Xiaoxun Ma-.Development of an in-situ H2 reduction and moderate oxidation method for 3,5-dimethylpyridine hydrogenation in trickle bed reactor)[J].化学科学与工程前沿,2022(12):1807-1817

trickle

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