Chinese Journal of Magnetic Resonance ›› 2021, Vol. 38 ›› Issue (4): 433-447.doi: 10.11938/cjmr20212938
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Shu-shu GAO1,2,Shu-tao XU1,*(),Ying-xu WEI1,Zhong-min LIU1
Received:
2021-07-21
Online:
2021-12-05
Published:
2021-09-14
Contact:
Shu-tao XU
E-mail:xushutao@dicp.ac.cn
CLC Number:
Shu-shu GAO,Shu-tao XU,Ying-xu WEI,Zhong-min LIU. Applications of Solid-State Nuclear Magnetic Resonance Spectroscopy in Methanol-to-Olefins Reaction[J]. Chinese Journal of Magnetic Resonance, 2021, 38(4): 433-447.
Fig.2
(a) In situ solid-state 13C MAS NMR spectra of continuous-flow 13C-methanol conversion over H-SSZ-13 catalyst at 220 ℃; (b) The 13C CP/MAS NMR and (c) 2D 13C-13C CORD (COmbined R2 Driven) spin diffusion MAS NMR spectra of in situ 13C-methanol conversion over H-SSZ-13 catalyst at 220 ℃ for 30 min[39]
Fig.4
(a) In situ 13C MAS NMR spectra of 13CH3OH reaction over H-SSZ-13 catalyst at 275 ℃, the characteristic signals at 154 and 245 ppm illustrate the formation of pentamethylcyclopentenyl cation (PMCP+), 0~40 ppm are assigned to the paraffin; (b) ① The initial ethene is generated from methanol by direct mechanism; ② MCP species are produced from initial ethene; ③ PMBs species are produced from the co-reaction of MCP species and methanol; ④ The olefins are formed via indirect mechanism including of aromatics-based, alkenes-based, and cyclopentadienes based cycles[47]
Fig.6
(a~c) 1H PFG NMR signals decay with linearly increasing gradient magnetic field strength in 16 steps for SAPO-35 (a), SAPO-34 (b) and DNL-6 (c) measured at 298 K. (d~f) The corresponding spin echo attention of PFG NMR on the log-linear scale for SAPO-35 (d), SAPO-34 (e) and DNL-6 (f) measured at 298 K. (g) The self-diffusion coefficients of methane acquired by PFG NMR and MD; (h) The loading dependence of experimental and simulated self-diffusion coefficients for methane; (i) The temperature dependence of self-diffusion coefficients for methane[68]
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