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基于载La半焦基催化的松木热解试验

Experiment on Pine Pyrolysis Based on Semi-coke Catalyzed by La

  • 摘要: 采用浸渍法,以松木热解半焦为载体,制备了载La半焦基催化剂,利用自行设计的两段式生物质催化热解固定床反应系统进行松木燃料棒催化热解试验,研究不同重整温度下载La半焦基催化剂对生物质热解气、焦油、焦炭三相产物的影响规律。通过气体组分的变化、焦油FTIR谱图的变化以及催化剂SEM、XRD表征特性测试,探讨载La半焦基催化剂对生物质热解催化重整效果随温度的变化规律,并与无催化剂和以半焦为催化剂的催化性能进行对比。试验表明:催化重整温度为800℃、La负载量为6%时,半焦基催化剂性能较好,经载La半焦基催化剂催化重整后,松木热解气最高产率达到531 g/kg焦油生成量最少,为90 g/kg;H2体积分数由650℃时的20.42%升高至850℃时的32.66%相较于无催化剂和半焦催化剂条件,载La半焦基催化剂在800℃时H2体积分数明显高于无催化剂时的16.77%和以半焦为催化剂时的20.06%;焦油生成量降低趋势明显;经催化重整后催化剂存在金属元素的团聚现象活性组分La2O2CO3和La转化为La2O3,伴随着积碳、积灰堵塞催化剂表面部分孔道,催化活性有所减弱。研究表明,载La半焦基催化剂表现出较好的松木催化热解性能。

     

    Abstract: The pine pyrolysis semi-coke was used as the carrier,and the La-loaded semi-coke based catalyst was prepared by the impregnation method.The self-constructed two-stage pyrolysis furnace was used as the test platform to conduct the pine fuel rod catalytic pyrolysis test.The changes of three-phase products of biomass pyrolysis gas,tar,and coke with La-loaded semi-coke based catalysts at different reforming temperatures were studied.Through the change of gas composition,the change of FTIR spectrum of tar,and the characterization of SEM and XRD of the catalyst,the variation of temperature of La-Ioaded semi-coke based catalyst on the pyrolysis and reforming effect of biomass with temperature was discussed,and compared with the catalytic performance of catalyst-free and semi-coke as catalyst.The results showed that semi-coke based catalysts with a supported La content of 6% had better performance.When the catalytic reforming temperature was 800℃,the maximum yield of pine pyrolysis gas was531 g/kg,and the lowest tar production was 90 g/kg after catalytic reforming with La-loaded semi-coke based catalyst.The H2 volume fraction was increased from 20.42% at 650℃ to 32.66% at 850℃.Compared with the conditions without catalyst and semi-coke catalyst,its H@ volume fraction at 800℃ was significantly higher than 16.77% without catalyst and 20.06% with semi-coke as catalyst.The amount of tar production was significantly reduced.After catalytic reforming,agglomeration of metal elements existed in the catalyst,and the active components La202 C03 and La were converted to La203.With the carbon and ash deposits blocking some pores on the catalyst surface,the catalytic activity was weakened.The results showed that La-loaded semi-coke based catalyst had good catalytic performance for pine pyrolysis.

     

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