Chinese Journal of Catalysis ›› 2023, Vol. 46: 11-27.DOI: 10.1016/S1872-2067(22)64194-9
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Shanfan Lina,c, Yuchun Zhia, Wenna Zhanga, Xiaoshuai Yuand, Chengwei Zhanga,c, Mao Yea, Shutao Xua, Yingxu Weia,*(), Zhongmin Liua,b,c,*()
Received:
2022-09-26
Accepted:
2022-11-10
Online:
2023-03-18
Published:
2023-02-21
Contact:
*E-mail: liuzm@dicp.ac.cn (Z. Liu), weiyx@dicp.ac.cn (Y. Wei)
About author:
Yingxu Wei received her PhD in Dalian Institute of Chemical Physics (DICP), Chinese Academy of Sciences (CAS) in 2001. During her service at the Applied Catalysis Laboratory of DICP since graduation, she conducted the postdoctoral study at University of Namur (Belgium) from 2003 to 2004. She has been the group leader of Catalysis and New Catalytic Reactions in National Engineering Laboratory of Methanol to Olefins since 2009 and was promoted to professor in 2011. Over the years, Prof. Wei has undertaken a number of key academic research projects commissioned by NSFC, CAS, MOST, PetroChina and other organizations. She has been involved in the researches on heterogeneous catalysis, methanol to olefins, catalysts and processes of hydrocarbon conversion, and catalytic conversion of methanol and methane derivatives. Over 110 academic papers authored by Prof. Wei have been published in scientific journals home and abroad and more than 60 patents have been applied and granted. She gained the national special support plan for high level talents. She is on the editorial board of the Chinese Journal of Catalysis and works as the editor of Microporous and Mesoporous Materials.Supported by:
Shanfan Lin, Yuchun Zhi, Wenna Zhang, Xiaoshuai Yuan, Chengwei Zhang, Mao Ye, Shutao Xu, Yingxu Wei, Zhongmin Liu. Hydrogen transfer reaction contributes to the dynamic evolution of zeolite-catalyzed methanol and dimethyl ether conversions: Insight into formaldehyde[J]. Chinese Journal of Catalysis, 2023, 46: 11-27.
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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(22)64194-9
Fig. 1. Conversion and methane selectivity (a), product distribution (b), and colorimetric determination of HCHO concentration (c) versus time on stream for MTO reaction over SAPO-34 at 623 K with a methanol WHSV of 2.0 h?1; (d) Operando DRIFT spectra recorded during methanol conversion on SAPO-34 at 623 K from 0 to 60 min.
Scheme 2. Chromogenic reaction for HCHO detection [42]. HCHO condenses with 4-amino-3-hydrazino-5-mercapto-1,2,4-triazole (AHMT, compound I) under alkaline conditions to form compound II, which are then oxidized by potassium periodate to purple-red 6-mercapto-5- triazole (4,3-b)-S-tetrazine (compound III).
Fig. 4. Conversion and methane selectivity (a), product selectivity (b) and colorimetric determination of HCHO concentration (c) versus time on stream for DTO reaction over SAPO-34 at 623 K with a DME WHSV of 1.4 h?1, achieving the same CH2-based WHSV of 6.2 × 10?3 molCH2 h?1 gcat?1 as MTO in Fig. 1(a). (d) Operando DRIFT spectra recorded during DME conversion on SAPO-34 at 623 K from 0 to 60 min.
Fig. 5. The experimental and calculated molar fraction of CH3OH and DME as a function of conversion for MTO (a) and DTO (b) reactions, over SAPO-34 at 623 K. Solid lines: calculated thermodynamic equilibrium molar fraction of CH3OH (orange) and DME (blue) according to the assumption that the CH3OH-DME equilibrium is always established. The detailed calculations are referred to Ref. [19] and described in supporting information and Fig. S12. Dashed lines: experimental molar fraction of CH3OH (orange and yellow) and DME (blue and light blue) in the effluent. Dashed lines with orange and blue ball: MTO and DTO reactions with an initial conversion of 100%, reaction conditions are same as Figs. 1(a) and 4(a). Dashed lines with yellow and light blue circle: MTO and DTO reactions with an initial conversion of 80%, reaction conditions are same as Fig. S8.
Fig. 6. Free energy profiles of propene methylation and HT reactions with methanol (a) and DME (b) over BASs of SAPO-34 at 623 K. Time evolution of 13C content in effluent olefins and retained aromatics formed in the 12C/13C methanol (c) and 12C/13C DME (d) switching experiments over SAPO-34 at 623 K with 12C-methanol/DME feeding for 18 min followed by 0.5, 1.0, and 1.5 min of 13C-methanol/DME feeding, respectively. Reaction conditions are same as Figs. 1(a) and 4(a). (e) Proposed predominant reaction pathways of methanol and DME conversions.
Fig. 7. (a) The principal catalyst deactivation pathways for methanol and DME conversion. (b) The conversion with time on stream for MTO and DTO reactions over SAPO-34 at 623 K. Points: experimental results, reaction conditions are same as Figs. 1(a) and 4(a); Solid lines: the fitted lines according to the deactivation model (Eqs. (1)?(4)).
Fig. 8. Cofeeding H2O in MTO reaction. Conversion (a,d) and colorimetric determination of HCHO concentration (b,c,e,f) versus time on stream for CH3OH-N2 and CH3OH-H2O cofeeding reactions over SAPO-34 at 723 K (a?c) and 548 K (d?f) with a methanol WHSV of 2.0 h?1. The molecular molar ratio of methanol to water is 1:9 for reaction at 723 K, 1:1 and 1:3 for reactions at 548 K.
Fig. 9. Cofeeding high-pressure H2 in MTO and DTO reaction. Conversion (a) and colorimetric determination of HCHO concentration (b-d) versus time on stream for CH3OH-N2 (molecular molar ratio 1:7), CH3OH-H2 (1:7) and DME-N2-H2 (0.5:0.5:7) cofeeding reactions over SAPO-34 at 723 K under 2 MPa. Reaction conditions: methanol WHSV is 4.0 h?1, DME was fed with equimolar carbon amounts of methanol, GHSV is 11206.4 h?1.
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