Investigation of the role of Nb on Pd?Zr?Zn catalyst in methanol steam reforming for hydrogen production |
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| Affiliation: | 1. CAS Key Laboratory of Low-Carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China;2. Key Laboratory of Bio-based Material, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao 266101, China;3. School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China;1. College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, Liaoning, China;2. School of Foreign Languages, Liaoning Shihua University, Fushun 113001, Liaoning, China;3. College of Environmental and Chemical Engineering, Dalian University, Dalian 116622, Liaoning, China;1. A.V.Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, 119991, Leninsky Prospect 29, Russian Federation;2. N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, Moscow, 119991, Leninsky Prospect 31, Russian Federation;1. Key Laboratory of Pressure Systems and Safety (MOE), School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai 200237, China;2. State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China;3. Space Power Technology State Key Laboratory, Shanghai Institute of Space Power-Sources, Shanghai 200245, China;1. International Research Center for Renewable Energy, State Key Laboratory of Multiphase Flow in Power Engineering, Xi''an Jiaotong University, Xi''an, Shaanxi, 710049, China;2. College of Chemistry and Molecular Sciences, Wuhan University, Wuhan, 430072, China;1. Graduate School of Science and Technology, Hirosaki University, 3 Bunkyo-cho, Hirosaki, Aomori 036-8561, Japan;2. North Japan Research Institute for Sustainable Energy, Hirosaki University, 2-1-3 Matsubara, Aomori 030-0813, Japan;3. Laboratory of Plasma Physical Chemistry, Dalian University of Technology, No.2 Linggong Road, Ganjingzi District, Dalian City, Liaoning 116024, China;4. Department of Chemical Engineering, Taiyuan University of Technology, Taiyuan 030024, China;5. Department of Nanoscience, Sojo University, 4-22-1 Ikeda, Nishi-ku, Kumamoto 860-0082, Japan |
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| Abstract: | Methanol steam reforming is regarded as a very promising process to generate H2 suitable for fuel cells. Typically, the Pd-based catalysts can catalyze efficiently methanol steam reforming for hydrogen production. But their high selectivity to CO, a byproduct of methanol reforming reaction, severely limits their potential application. In this work, a series of Nb-modified Pd?Zr?Zn catalysts with different Nb loadings were prepared to study their catalytic activities with more focus on the role of Nb on Pd?Zr?Zn catalyst for methanol steam reforming. The prepared catalysts were fully analyzed by using various characterization techniques, for example, ICP, BET, SEM, XRD, H2-TPR, NH3-TPD, HRTEM, CO chemisorption, XPS, and Raman. The experimental results showed that an increase in Nb loading for the Nb-modified Pd?Zr?Zn catalysts led to a decrease of the methanol conversion and H2 production rate. This was probably due to the decrease in the amount of oxygen vacancies on the catalyst surface. However, introduction of Nb into Pd?Zr?Zn catalyst increased the acid strength on the catalytic surface. The aldehyde species derived from methanol decomposition were readily transformed to HCOOH, thus yielding high selectivity to CO2 for the Nb-modified Pd?Zr?Zn catalysts. Significantly, the addition of Nb to Pd?Zr?Zn catalyst facilitated the incorporation of Pd into the ZnO lattices, which led to the formation of Pd?Zn alloy. Consequently, the Nb-modified Pd?Zr?Zn catalysts exhibited significantly lower CO selectivity and production rate than the Pd?Zr?Zn catalyst. From the results, this work offers a new way to the rational design of selective methanol steam reforming catalysts to decrease the formation of byproduct CO. |
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| Keywords: | Methanol steam reforming Hydrogen production Nb-modified Pd?Zr?Zn catalysts Pd?Zn alloy Oxygen vacancies |
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