Citation: Zilong Shao, Xiaofang Liu, Shunan Zhang, Hui Wang, Yuhan Sun. CO Hydrogenation to Ethanol over Supported Rh-Based Catalyst: Effect of the Support[J]. Acta Physico-Chimica Sinica, ;2021, 37(10): 191105. doi: 10.3866/PKU.WHXB201911053 shu

CO Hydrogenation to Ethanol over Supported Rh-Based Catalyst: Effect of the Support

Zilong Shao ^{1, 2} ,
Xiaofang Liu ¹ ,
Shunan Zhang ^{1, 2} ,
Hui Wang ^{1, 2,,} ,
Yuhan Sun ^{1, 2, 3,,}

1.
CAS Key Lab of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
2.
University of Chinese Academy of Science, Beijing 100049, China
3.
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China

Corresponding author: Hui Wang, wanghh@sari.ac.cn Yuhan Sun, sunyh@sari.ac.cn
Received Date: 27 November 2019
Revised Date: 29 December 2019
Accepted Date: 6 January 2020
Available Online: 9 January 2020
Fund Project: the National Natural Science Foundation of China 21776296the National Key Research and Development Program of China 2017YFB0602203Strategic Priority Research Program of the Chinese Academy of Sciences XDA21090201the Chinese Academy of Sciences ZDRW-ZS-2018-1-3Shanghai Sailing Program, China 19YF1453000

Ethanol has great application prospects given it is an important essential chemical and a substitute for traditional energy sources. Currently, ethanol production is achieved through grain fermentation and petroleum-based ethylene hydration. However, the inefficient fermentation processes and increasingly depleted crude oil resources hinder the large-scale production of ethanol. Therefore, the development of alternative technologies for ethanol production has become an important issue. The direct production of ethanol from syngas (CO + H₂) is considered to be a new strategy to acquire high value-added products and achieve clean utilization of carbonaceous resources such as coal, natural gas, and biomass. Supported Rh-based catalysts have been extensively studied as the most promising and effective systems for the direct production of ethanol from syngas. The use of promoters and supports is generally effective in increasing the activity and ethanol selectivity of supported Rh-based catalysts. Fe is widely used in the research on Rh-based catalysts, as it is one of the most effective promoters for enhancing ethanol selectivity. In this work, with the aim of exploring the role of the support, we used the incipient wetness impregnation method to prepare Fe-promoted Rh-based catalysts supported by CeO₂, ZrO₂, and TiO₂ for the synthesis of ethanol from syngas. CO conversion of CO on the RhFe/TiO₂ catalyst was as high as 18.2% under the reaction conditions of 250 ℃ and 2 MPa, and the selectivity to ethanol in the alcohol distribution was 74.7%, which was much higher than that observed with RhFe/CeO₂ and RhFe/ZrO₂ under the same conditions. The characterization results showed that the specific surface of the catalyst followed the order RhFe/CeO₂ < RhFe/ZrO₂ < RhFe/TiO₂; the dispersion of Rh increased sequentially, and the particle size decreased in the same order. A larger specific surface area may favor the dispersion of the Rh species, and the highly dispersed Rh species would imply a greater number of active sites on the surface of the support. The results of H₂-temperature-programmed reduction indicated possible interactions between Rh and the support as well as between Rh and Fe, and partial reduction of TiO₂ under the experimental reduction conditions; however, the other supports did not undergo reduction. The results of X-ray photoelectron spectroscopy indicated that the RhFe/TiO₂ catalyst had the largest amount of Rh⁰ as well as Rh⁺ species. Thus, this catalyst has more (Rh_x⁰-Rh_y⁺)-O-Fe^δ+ active sites for the synthesis of ethanol, which greatly increases the ethanol selectivity. CO-temperature programmed desorption was used to confirm the CO adsorption capacity of different catalysts. The results showed that TiO₂ enhances the adsorption of CO due to the presence of more O vacancies and Ti³⁺ ions, which is beneficial to the improvement of the catalyst activity.
- Rh-based catalyst,
- Support effect,
- Ethanol synthesis,
- Syngas conversion,
- Rh dispersion,
- Iron
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