Chem. J. Chinese Universities ›› 2026, Vol. 47 ›› Issue (10): 20260245.doi: 10.7503/cjcu20260245
• Physical Chemistry • Previous Articles Next Articles
GAO Fen’e1(
), WANG Ruiying1, GUO Junlan1, ZHANG Xi1, CHENG Shangyuan2, YUAN Zhiguo2(
), LIU Jingyao3(
)
Received:2026-06-23
Online:2026-10-10
Published:2026-09-03
Contact:
GAO Fen’e, YUAN Zhiguo, LIU Jingyao
E-mail:gaofene@sxct.edu.cn;ncustyzg@nuc.edu.cn;ljy121@jlu.edu.cn
Supported by:CLC Number:
TrendMD:
GAO Fen’e, WANG Ruiying, GUO Junlan, ZHANG Xi, CHENG Shangyuan, YUAN Zhiguo, LIU Jingyao. Theoretical Study of the Influence of H-SAPO-34 Modified with Zn2+ on Olefin-based Cycles During Methanol-to-olefins Reaction[J]. Chem. J. Chinese Universities, 2026, 47(10): 20260245.
| Site | ΔGmeth/(kJ∙mol-1) | ΔGcrack/(kJ∙mol-1) | ΔGpara/(kJ∙mol-1) | ΔGover/(kJ∙mol-1) | TOF/s-1 |
|---|---|---|---|---|---|
| 1st/2nd/3rd | C2H4/C3H6 | C2H4/C3H6 | C2H4/C3H6 | C2H4/C3H6 | |
| H⁃SAPO⁃34(BAS) | 109/125/119 | 95/61 | 174/135 | 174/149 | 8.2×10-8/2.5×101 |
| Zn@H⁃SAPO⁃34(BAS) | 79/85/92 | 97/73 | 131/112 | 131/112 | 6.9×10-5/2.5×104 |
| Zn@H⁃SAPO⁃34(LAS) | 135/168/167 | 98/71 | 137/199 | 181/199 | 1.4×10-7/9.2×10-1 |
Table 1 Gibbs free energy barriers(ΔG) and turnover frequencies(TOF) for the olefin cycle at different active sites in H-SAPO-34 and Zn@H-SAPO-34 at 673 K*
| Site | ΔGmeth/(kJ∙mol-1) | ΔGcrack/(kJ∙mol-1) | ΔGpara/(kJ∙mol-1) | ΔGover/(kJ∙mol-1) | TOF/s-1 |
|---|---|---|---|---|---|
| 1st/2nd/3rd | C2H4/C3H6 | C2H4/C3H6 | C2H4/C3H6 | C2H4/C3H6 | |
| H⁃SAPO⁃34(BAS) | 109/125/119 | 95/61 | 174/135 | 174/149 | 8.2×10-8/2.5×101 |
| Zn@H⁃SAPO⁃34(BAS) | 79/85/92 | 97/73 | 131/112 | 131/112 | 6.9×10-5/2.5×104 |
| Zn@H⁃SAPO⁃34(LAS) | 135/168/167 | 98/71 | 137/199 | 181/199 | 1.4×10-7/9.2×10-1 |
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