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Frontiers of Chemical Science and Engineering

ISSN 2095-0179

ISSN 2095-0187(Online)

CN 11-5981/TQ

Postal Subscription Code 80-969

2018 Impact Factor: 2.809

Front. Chem. Sci. Eng.    2022, Vol. 16 Issue (12) : 1807-1817    https://doi.org/10.1007/s11705-022-2243-2
RESEARCH ARTICLE
Development of an in-situ H2 reduction and moderate oxidation method for 3,5-dimethylpyridine hydrogenation in trickle bed reactor
Tao Lin1,2,3,4,5,6,7, Xiaoxun Ma1,4,5,6,7()
1. School of Chemical Engineering, Northwest University, Xi’an 710069, China
2. Kaili Catalyst & New Materials Co., Ltd. Xi’an 710201, China
3. Shaanxi Key Laboratory of Catalytic Materials and Technology, Xi’an 710201, China
4. Chemical Engineering Research Center of the Ministry of Education (MOE) for Advanced Use Technology of Shanbei Energy, Xi’an 710069, China
5. Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Xi’an 710069, China
6. Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi, Xi’an 710069, China
7. International Scientific and Technological Cooperation Base of the Ministry of Science and Technology (MOST) for Clean Utilization of Hydrocarbon Resources, Xi’an 710069, China
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Abstract

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 °C 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 temperature 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 °C). Excessive oxidation (200 °C) 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.

Keywords Ru/C catalyst      in-situ H2 reduction and moderate oxidation      in-situ reduction      non-in-situ reduction      hydrogenation of 3,5-dimethylpyridine     
Corresponding Author(s): Xiaoxun Ma   
Online First Date: 09 November 2022    Issue Date: 19 December 2022
 Cite this article:   
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]. Front. Chem. Sci. Eng., 2022, 16(12): 1807-1817.
 URL:  
https://academic.hep.com.cn/fcse/EN/10.1007/s11705-022-2243-2
https://academic.hep.com.cn/fcse/EN/Y2022/V16/I12/1807
Fig.1  TBR for DPY hydrogenation.
SampleInitial O2 concentration/%Storage time/hSBETa)/(m2·g?1)Vpb)/(cm3·g?1)Dpc)/nmConversion/%
140 °C100 °C
Ru/C-n21 (Ari)12743.60.4082.9375.55.5
7275.75.4
Ru/C-y65.44.2
Ru/C-i00.512738.50.4013.0867.24.4
11267.14.4
21267.54.5
17267.94.6
Ru/C-i1112821.90.4582.8990.88.1
17290.38.1
Ru/C-i2112804.60.4232.8633.71.5
Tab.1  Physico-chemical properties of the samples
Fig.2  N2 adsorption-desorption isotherms and pore size distributions of the Ru/C catalysts.
Fig.3  H2-TPR profiles of the samples: (a) carbon support, unreduced and Ru/C-y catalyst; (b) Ru/C-n, Ru/C-i0, Ru/C-i1 and Ru/C-i2 catalyst.
Fig.4  H2-TPD profiles of the Ru/C catalysts.
Fig.5  X-ray diffraction patterns of the Ru/C catalysts.
CatalystComposition and mass fraction of each element/%
COAlSiSClFeRu
Ru/C-n84.315.810.721.760.761.91.633.11
Ru/C-i084.585.880.711.770.751.581.593.14
Ru/C-i184.386.050.711.830.781.551.573.13
Ru/C-i283.466.850.751.790.771.661.553.17
Tab.2  Surface elements of the Ru/C catalysts
Fig.6  XPS spectra of Ru/C catalysts: (a) survey spectrum; (b) C 1s + Ru 3d; (c) Ru 3p.
CatalystRu0Run+Ru0 /Run+
BE/eVArea/%BE/eVArea/%
Ru/C-n463.3972.59465.727.412.65
Ru/C-i0463.2988.04465.711.967.36
Ru/C-i1463.4286.99465.713.016.69
Ru/C-i2463.3759.26465.740.741.45
Tab.3  Relatively abundance (%) of the components of the Ru 3p spectra
Fig.7  Raman spectra of the Ru/C catalysts.
Fig.8  (a) O2 chemisorption and (b) O2-TPD profiles of the Ru/C catalysts.
Fig.9  Effect of reaction temperature on DPY conversion over the Ru/C catalysts.
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