不同方法改性的镍负载柱撑蛭石对CH4与CO2重整反应的催化性能研究

The Reforming Reaction of CH4 and CO2 Zed by Nickel-loading Column Vermiculite Modified by Different Methods

  • 摘要: 采用新疆尉犁蛭石矿,依次经过HNO3酸化、600 ℃煅烧、NaCl交换,再用Keggin离子插层,得到了羟基铝柱撑蛭石。以柱撑蛭石为载体制备了一系列Ni负载的催化剂(12Ni-CPVMT、12Ni-2CaO-CPVMT、12Ni-2MgO-PCVMT)并将其应用于甲烷重整反应。结果表明:12Ni-CPVMT的催化活性仅为17 h,二氧化碳的转化率低,12Ni-2CaO-CPVMT和12Ni-2CaO-PCVMT在反应3 h内表现出较高的催化活性和稳定性,但随后观察到失活。12Ni-2MgO-CPVMT催化剂在反应22 h后,甲烷的转化率降低至17.94%,而12Ni-2CaO-CPVMT催化剂在反应24 h内表现出较高的稳定性,甲烷的转化率仅降低了1.28%。这可能与其层间结构和膨胀的蛭石中的金属氧化物有关。

     

    Abstract: The reforming of CH4 with CO2 to produce syngas is not only beneficial to the rational utilization of natural gas resources and mitigation of greenhouse gas emissions, but also can be used to store solar energy and nuclear energy by effectively utilizing the reversible and strong heat absorption process of the reforming reaction. Therefore, it has received widespread attention from academia as well as industry worldwide. In this study, hydroxy aluminum columnar vermiculite was obtained by using Xinjiang Yuli vermiculite ore, which was acidified with HNO3, cauterized at 600 ℃, exchanged with NaCl, and intercalated with Keggin ions in order to obtain hydroxy aluminum columnar vermiculite. A series of Ni-loaded catalysts (12Ni-CPVMT, 12Ni-2CaO-CPVMT, 12Ni-2MgO-PCVMT) were prepared for methane reforming reaction using column-supported vermiculite as the carrier. The results showed that the activity of 12Ni-CPVMT was only 17 h and the conversion of CO2 was low. 12Ni-2CaO-CPVMT and 12Ni-2MgO-PCVMT showed high catalytic activity and stability within 3 h of reaction, but deactivation was subsequently observed. 12Ni-2MgO-CPVMT catalyst, after 22 h of reaction, reduced the conversion of methane to 17.94%. In contrast, 12Ni-2CaO-CPVMT showed high stability within 24 h of the reaction, and the conversion of methane was reduced by only 1.28%. This may be related to its interlayer structure and the metal oxides in the swollen vermiculite.

     

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