MoS2在低熟有机质热演化生烃中的催化作用  

Catalytic role of MoS2 in hydrocarbon generation during thermal evolution of low-maturity kerogen

作　　者：李亢 卢鸿[1,2] 马宏良 赵忠峰 黄华梅 彭平安[1,2] LI Kang;LU Hong;MA Hongliang;ZHAO Zhongfeng;HUANG Huamei;PENG Ping’an(State Key Laboratory of Organic geochemistry,Guangzhou Institute of Geochemistry,CAS,Guangzhou,Guangdong 510640,China;CAS Center for Excellence in Deep Earth Science,Guangzhou,Guangdong 510640,China;University of Chinese Academy of Sciences,Beijing 100049,China;South China Sea Institute of Planning and Environment Research,Guangzhou,Guangdong 510300,China;Guangdong Zeyu Experimental Equipment Co.,Guangzhou,Guangdong 510440,China)

机构地区：[1]中国科学院广州地球化学研究所有机地球化学国家重点实验室,广东广州510640 [2]中国科学院深地科学卓越创新中心,广东广州510640 [3]中国科学院大学,北京100049 [4]南海规划与环境研究院,广东广州510300 [5]广东泽域实验设备有限公司,广东广州510440

出　　处：《石油与天然气地质》2023年第1期186-194,共9页Oil & Gas Geology

基　　金：中国科学院A类战略性先导科技专项(XDA14010102);国家重点研发计划重点专项(2017YFC0603102);国家重点研发项目(2019YFC0605502);国家自然科学基金项目(41973069,41673045)。

摘　　要：MoS_(2)常用作有机质催化加氢热解的高效催化剂,通过活化流动相的高压H2来提高热解产物的产率。但是MoS_(2)催化剂是否对有机质自身热演化生烃有影响却少有研究。为此,通过对低成熟Alum页岩干酪根及添加MoS_(2)催化剂的干酪根进行热模拟生烃对比实验,探究了MoS_(2)对干酪根热演化生烃的影响。实验结果表明MoS_(2)的加入使低熟干酪根具有更高的成烃潜力:(1)使轻烃(C_(6-14))峰值产率增加且峰值温度前移24℃,但重烃(C_(14+))峰值产率显著降低,表明MoS_(2)加速了重烃向轻烃的热裂解转化;(2)使湿气产率在峰值温度(456℃)前轻微增加,但峰值温度后明显降低,表明MoS_(2)促进了湿气的生成及后期的裂解;(3)使甲烷(C_(1))产率明显增加,特别是在528℃后C_(1)增加了近50%,这可能是因为MoS_(2)促进了高-过成熟阶段干酪根的加氢作用;(4)通过FeS_(2)(黄铁矿)与MoS_(2)催化效应的系统对比,认为两种催化效应的差异主要受催化剂的结构、稳定性及硫的活性控制。MoS_(2)has been commonly used as an efficient catalyst for the kerogen hydropyrolysis to improve the yield with activated high-pressure and mobile phase of H2.However,there is little document on whether MoS_(2)has a certain effect on the thermal maturation of organic matter and hydrocarbon generation.In this study,the effects of MoS_(2)on the thermal evolution of organic matter and hydrocarbon generation are investigated by comparative thermal simulation experiments on kerogen of low maturity from the Alum Shale with and without MoS_(2)added.The results show that low-mature kerogen has greater potential for hydrocarbon generation in presence of MoS_(2).MoS_(2)acts to increase the peak yield of light hydrocarbons (C_(6-14)),while decrease the peak yield of heavy hydrocarbons (C_(14+)),and lowering the temperature of peak hydrocarbon generation by about 24℃at the same time,indicating that MoS_(2)serves to accelerate the thermal cracking of heavy hydrocarbons to light hydrocarbons.The adding of MoS_(2)also can slightly increase the yield of wet gases (C_(2-5)) before the peak hydrocarbon generation temperature (456℃)is reached,but significantly decrease it after the temperature surpasses its peak hydrocarbon generation value,indicating that MoS_(2)can promote the generation and later cracking of wet gases.In addition,the existence of MoS_(2)also remarkably raise the yield of methane (C_(1)),especially at a temperature higher than 528℃when the methane yield increases by nearly 50%,a possible result of MoS_(2)promoting the hydrogenation of kerogen at the high-to-over-mature stage.The difference of catalytic effect between pyrite (FeS_(2)) and MoS_(2)is systematically compared,which is mainly controlled by the structure,stability and sulfur activity of catalysts.

关 键 词：MoS2催化剂 加氢 催化效应 硫 热模拟 干酪根 生烃潜力 

分 类 号：TE122.1[石油与天然气工程—油气勘探]