摘要：The participation of small H-2 molecules in hydrate formation generally includes single and multiple occupancy, and the state could vary frequently due to their high fluidity. In this study, distinctly split DSC peaks for hydrate dissociation in constant CO2/H-2 gas phase systems were found, which generally means the coexistence of several hydrates with different phase equilibrium temperatures. Based on the results of hydrate equilibrium decomposition conditions and decomposition enthalpies, we attributed the occurrence of this peculiar phenomenon mainly to different occupation patterns of H-2 molecules in hydrate cages. However, several occupancies in the mild conditions of this study may be metastable, which was significantly related to H-2 escape. Raman results demonstrated the existence of single occupancy of H-2 molecule in both of the 512 and 51262 cages. In addition, coexisting of CO2 and H-2 in 51262 cage may also be detected. The effects of hydrate formation time and morphology on the split DSC peaks further indicated the occupation-related H-2 molecule aggregation and probabilistic escape. The discovery in this work may provide some new insights into the deeper understanding of the physical/ chemical properties behind clathrate hydrate in the future.

关键字：CO2/H-2 hydrate; Split DSC peaks; Multiple H-2 molecule occupation; Several dissociation temperatures; Metastable; Coexistence

ISSN号：0360-5442

卷、期、页：卷: 262子辑: A

发表日期：2023-01-01

影响因子：0.000000

期刊分区（SCI为中科院分区）：一区

收录情况：SCI（科学引文索引印刷版）,EI（工程索引）,SCIE（科学引文索引网络版）

发表期刊名称：ENERGY

参与作者：冯景春

通讯作者：谢炎,朱玉洁,程立伟,钟瑾荣

第一作者：郑涛,肖朋,孙长宇,陈光进

论文类型：期刊论文

论文概要：谢炎,朱玉洁,程立伟,郑涛,钟瑾荣,肖朋,孙长宇,陈光进,冯景春，The coexistence of multiple hydrates triggered by varied H-2 molecule occupancy during CO2/H-2 hydrate dissociation，ENERGY，2023，卷: 262子辑: A

论文题目：The coexistence of multiple hydrates triggered by varied H-2 molecule occupancy during CO2/H-2 hydrate dissociation