促进剂体系中二氧化碳水合物常压分解

目前，水合物法捕获二氧化碳时，都会添加不同的形成促进剂。而这些促进剂对后期二氧化碳水合物运输条件、封存条件的影响还未可知，因此本文对比研究了纯冰粉体系、单一促进剂体系和复配体系中CO₂水合物的稳定性，促进剂分别选用0.24g/L十二烷基酸钠（SDS）、0.288g/L四丁基溴化铵（TBAB）、5g/L纳米石墨（GN）及0.33g/L NaCl 4种促进剂。在常压、274.65K条件下利用定压分解方法研究不同体系中CO₂水合物的分解动力学特性。结果表明：单一促进剂体系中CO₂水合物的稳定性由强到弱的顺序为SDS>TBAB>GN≈纯冰粉>NaCl，并且SDS能够延长CO₂水合物分解时间，其平均分解速率相对于纯冰粉体系分别减少了29.6%、15.8%及18.5% 。在复配促进剂体系中TBAB+NaCl中水合物稳定性最强，TBAB占主导作用，NaCl＋GN中水合物稳定性最弱，NaCl占主导作用。此外文章还分析了促进剂体系中CO₂水合物稳定性提高的作用机理，主要与促进剂本身的性质有关。

Atmospheric pressure decomposition of carbon dioxide hydrate in accelerator system

At present, different formation promoters are added to capture CO₂ in hydrate processes. However, the influence of these accelerators on the transport and storage conditions of CO₂ hydrates is unknown. Therefore, the stability of CO₂ hydrate in pure ice powder system, single accelerator system and compound system was studied in this paper. The accelerators were 0.24g/L sodium dodecylate (SDS), 0.288g/L tetrabylammonium bromide (TBAB), 5g/L nano graphite (GN) and 0.33g/L NaCl. The decomposition kinetics of CO₂ hydrate in different systems were studied at 274.65K and atmospheric pressure by using the decomposition method of temperature rising at constant pressure. The results show that the order of stability of CO₂ hydrate in single accelerator system from strong to weak is SDS>TBAB>GN≈pure ice powder>NaCl. SDS can prolong the decomposition time of CO₂ hydrate, and the average decomposition rate was reduced by 29.6%, 15.8% and 18.5%, respectively, compared with the pure ice powder system. Among the compound accelerator systems, TBAB+NaCl has the strongest stability and TBAB plays a dominant role, while NaCl+GN has the weakest stability and NaCl plays a dominant role. In addition, the mechanism of enhancing the stability of CO₂ hydrate in accelerator system was also analyzed, which is mainly related to the properties of accelerator itself. The experimental data are expected to be applied to CO₂ hydrate storage and transportation technology and enhance the commercial application of CO₂ hydrate.