Preparation of natural gas adsorbents under low activation ratio:
Enhancing storage capacity by using promoters
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摘要: 以石油焦为原料、KOH为主活化剂，在低活化比mKOH∶mC＝2∶1下制备吸附剂，考察了活化助剂KNO3、NaNO3、Mg(NO3)2、Ni(NO3)2和HJ对吸附剂储气性能的影响，对活化助剂提高吸附剂性能的机理进行了分析。结果表明,活化物料中加入适量助剂KNO3、Mg(NO3)2、Ni(NO3)2或HJ能显著提高吸附剂性能，HJ与Mg(NO3)2、Ni(NO3)2协同活化的效果最好。其中，Mg(NO3)2、HJ加入量均为10 %（助剂与石油焦质量分数）下制备的吸附剂样品在25℃、3.5MPa下对甲烷质量吸附量达0.143，有效体积释放量达117.1，性能超过活化比mKOH∶mC=3∶1、无助剂下制备的吸附剂。Abstract: The natural gas adsorbents were prepared with KOH as activation agent and petroleum coke as feed under low activation ratio mKOH/mC of 2. The influences of promoters like KNO3, NaNO3, Mg(NO3)2, Ni(NO3)2 and HJ on the methane storage performance of the adsorbents were investigated. The mechanism for the enhancement in the adsorbent capacity by using promoter was analyzed in detail. The results show that the adsorbents with good storage performance can be obtained by adding suitable amounts of KNO3, Mg(NO3)2, Ni(NO3)2 or HJ into mixed activation materials. Furthermore, Mg (NO3)2, Ni (NO3)2 coupling with HJ gives excellent co-activation effect on the adsorbents prepared. The methane mass uptake and discharging volume of the adsorbent Mg3HJ2, prepared with 10% (mass ratio of the promoter to coke) of Mg (NO3)2 and HJ, reaches 0.143 and 117.1, respectively, under 25℃ and 3.5MPa. The storage capacity of Mg3HJ2 is even higher than that of the adsorbent FS3 obtained under the activation ratio of 3 without using any promoter.
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Key words:
- adsorbent /
- natural gas /
- promoter /
- activation
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