Yan Lijun, Chen Guangjin, Pang Weixin, Liu Jiang
State Key Laboratory of Heavy Oil Processing, University of Petroleum, Changping County, Beijing 102249, People's Republic of China.
J Phys Chem B. 2005 Mar 31;109(12):6025-30. doi: 10.1021/jp045679y.
The formation of methane hydrate in wet activated carbon was studied. The experimental results demonstrated that the formation of methane hydrate could be enhanced by immersing activated carbon in water. A maximum actual storage capacity of 212 standard volumes of gas per volume of water was achieved. The apparent storage capacity of the activated carbon + hydrate bed increased with the increasing of mass ratio of water to carbon until reaching a maximum, then decreased drastically as the bulk water phase emerged above the wet carbon bed. The highest apparent storage capacity achieved was 140 v/v. A hydrate formation mechanism in the wet activated carbon was proposed and a mathematical model was developed. It has been shown that the proposed model is adequate for describing the hydrate formation kinetics in wet activated carbon. The kinetic model and the measured kinetic data were used to determine the formation conditions of methane hydrate in wet carbon, which are in good agreement with literature values and demonstrate that hydrate formation in wet carbon requires lower temperature or higher pressure than in the free water system.
研究了湿活性炭中甲烷水合物的形成。实验结果表明，将活性炭浸入水中可增强甲烷水合物的形成。实现了每体积水212标准体积气体的最大实际储存容量。活性炭+水合物床的表观储存容量随着水与碳质量比的增加而增加，直至达到最大值，然后随着湿碳床上方出现大量水相而急剧下降。达到的最高表观储存容量为140 v/v。提出了湿活性炭中的水合物形成机理并建立了数学模型。结果表明，所提出的模型足以描述湿活性炭中水合物的形成动力学。利用动力学模型和实测动力学数据确定了湿碳中甲烷水合物的形成条件，这些条件与文献值吻合良好，表明湿碳中水合物的形成比在自由水体系中需要更低的温度或更高的压力。
