Ni-Mg-ZrO2催化剂上煤层甲烷三重整制合成气

采用共沉淀法制备Ni-ZrO₂和Ni-Mg-ZrO₂催化剂,用BET、XRD、H₂-TPR、CO₂-TPD等技术对催化剂进行了表征。采用固定床流动反应装置,研究了催化剂在煤层甲烷三重整制合成气反应中的催化性能;考察了反应温度和原料气体组成对反应的影响。实验结果表明,Ni-Mg-ZrO₂催化剂在反应温度800℃、常压、空速为30 000 mL/(g·h)、CH₄/CO₂/H₂O/O₂/N₂=1.0/0.45/0.45/0.1/0.4的条件下,CH₄转化率为99%,CO₂转化率为65%左右,生成合成气H₂/CO体积比为1.5,并在58 h的实验中催化剂活性和稳定性良好。这主要归因于催化剂中金属和载体之间的强相互作用、催化剂的高热稳定性和强碱性。此外,较高的反应温度有利于甲烷三重整反应的进行;通过调节原料气组成,可以获得不同H₂/CO体积比的合成气。

Tri-reforming of coal bed methane to syngas over the Ni-Mg-ZrO2 catalyst

Ni-ZrO2 and Ni-Mg-ZrO2 catalysts were prepared by a co-precipitation method,and then were characterized by BET,XRD,H2-TPR and CO2-TPD techniques.The performances of catalysts in the tri-reforming of coal bed methane to syngas were studied in a fixed bed reactor.The reaction conditions(temperature and feed gas composition) were mainly investigated.The results showed that at t=800 ℃,atmospheric pressure,CH4/CO2/H2O/O2/N2=1.0/0.45/0.45/0.1/0.4,GHSV=30 000 mL/(g·h),about 99% of CH4 conversion,65% of CO2 conversion,and VH2/VCO of 1.5 could be achieved during 58 h of reaction,which are related to the strong metal-support interaction,the good thermal stability and basic nature of the catalyst.Furthermore,high temperature favors the tri-reforming of methane.By adjusting the feed gas composition,a specific VH2/VCO could be achieved.