Effects of iron precursors on the structure and catalytic performance of iron molybdate prepared by mechanochemical route for methanol to formaldehyde

doi:10.1016/j.cjche.2020.03.009

Chinese Journal of Chemical Engineering ›› 2020, Vol. 28 ›› Issue (6): 1603-1611.DOI: 10.1016/j.cjche.2020.03.009

• Catalysis, Kinetics and Reaction Engineering • Previous Articles Next Articles

Effects of iron precursors on the structure and catalytic performance of iron molybdate prepared by mechanochemical route for methanol to formaldehyde

Lingtao Kong^1,3, Shengtao Xu¹, Xue Liu¹, Chaofan Liu¹, Dandan Zhang¹, Ling Zhao²

1 Key Laboratory of Coal Clean Conversion & Chemical Engineering Process, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China;
2 Key Laboratory of Oil and Gas Fine Chemicals of Education, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China

Received:2019-09-01 Revised:2020-02-11 Online:2020-07-29 Published:2020-06-28
Contact: Lingtao Kong, Ling Zhao
Supported by:
This work is supported by the Chang Jiang Scholars Programme of China, the Key research and development project of Xinjiang Uygur Autonomous Region (2017B02012), the Natural Science Foundation of Xinjiang University (BS62331), the Xinjiang Uygur Autonomous Region 100 Young Doctors Introduction Program. We also thank Xinjiang University Institute of Experimental Center for material characterization and analysis.

Effects of iron precursors on the structure and catalytic performance of iron molybdate prepared by mechanochemical route for methanol to formaldehyde

Lingtao Kong^1,3, Shengtao Xu¹, Xue Liu¹, Chaofan Liu¹, Dandan Zhang¹, Ling Zhao²

1 Key Laboratory of Coal Clean Conversion & Chemical Engineering Process, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China;
2 Key Laboratory of Oil and Gas Fine Chemicals of Education, College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, China

通讯作者: Lingtao Kong, Ling Zhao
基金资助:
This work is supported by the Chang Jiang Scholars Programme of China, the Key research and development project of Xinjiang Uygur Autonomous Region (2017B02012), the Natural Science Foundation of Xinjiang University (BS62331), the Xinjiang Uygur Autonomous Region 100 Young Doctors Introduction Program. We also thank Xinjiang University Institute of Experimental Center for material characterization and analysis.

Abstract

Abstract: Mechanochemical synthesis has been applied for many novel material preparations and gained more and more attention due to green and high-efficiency recently. In order to explore the influences of iron precursors on structure and performance of iron molybdate catalyst prepared by mechanochemical route, three typical and cheap iron precursors have been used in preparation of iron molybdate catalyst. Many characterization methods have been employed to obtain the physical and chemical properties of iron molybdate catalyst. Results indicate that iron precursors have the significant impact on the phase composition, crystal morphology and catalytic performance in the conversion of methanol to formaldehyde. It is hard to regulate the phase composition by changing Mo/Fe mole ratios for Fe₂(SO₄)₃ as iron precursor. In addition, as for Fe₂(SO₄)₃, the formaldehyde yield is lower than that from iron molybdate catalyst prepared with Fe(NO₃)₃·9H₂O due to the reduction in Fe₂(MoO₄)₃ phase as active phase. Based on mechanochemical and coprecipitation method, the solvent water could be a key factor for the formation of MoO₃ and Fe₂(MoO₄) for FeCl₃·6H₂O and Fe₂(SO₄)₃ as precursors. Iron molybdate catalyst prepared with Fe(NO₃)₃·9H₂O by mechanochemical route, shows the best methanol conversion and formaldehyde yield in this reaction.

Key words: Iron precursors, Mechanochemical route, Iron molybdate catalyst, Methanol oxidation

摘要： Mechanochemical synthesis has been applied for many novel material preparations and gained more and more attention due to green and high-efficiency recently. In order to explore the influences of iron precursors on structure and performance of iron molybdate catalyst prepared by mechanochemical route, three typical and cheap iron precursors have been used in preparation of iron molybdate catalyst. Many characterization methods have been employed to obtain the physical and chemical properties of iron molybdate catalyst. Results indicate that iron precursors have the significant impact on the phase composition, crystal morphology and catalytic performance in the conversion of methanol to formaldehyde. It is hard to regulate the phase composition by changing Mo/Fe mole ratios for Fe₂(SO₄)₃ as iron precursor. In addition, as for Fe₂(SO₄)₃, the formaldehyde yield is lower than that from iron molybdate catalyst prepared with Fe(NO₃)₃·9H₂O due to the reduction in Fe₂(MoO₄)₃ phase as active phase. Based on mechanochemical and coprecipitation method, the solvent water could be a key factor for the formation of MoO₃ and Fe₂(MoO₄) for FeCl₃·6H₂O and Fe₂(SO₄)₃ as precursors. Iron molybdate catalyst prepared with Fe(NO₃)₃·9H₂O by mechanochemical route, shows the best methanol conversion and formaldehyde yield in this reaction.

关键词: Iron precursors, Mechanochemical route, Iron molybdate catalyst, Methanol oxidation

Lingtao Kong, Shengtao Xu, Xue Liu, Chaofan Liu, Dandan Zhang, Ling Zhao. Effects of iron precursors on the structure and catalytic performance of iron molybdate prepared by mechanochemical route for methanol to formaldehyde[J]. Chinese Journal of Chemical Engineering, 2020, 28(6): 1603-1611.

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Effects of iron precursors on the structure and catalytic performance of iron molybdate prepared by mechanochemical route for methanol to formaldehyde

Effects of iron precursors on the structure and catalytic performance of iron molybdate prepared by mechanochemical route for methanol to formaldehyde

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