Comparison between in-situ and ex-situ catalytic pyrolysis of sawdust for gas production
Comparison between in-situ and ex-situ catalytic pyrolysis of sawdust for gas production
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木屑原位和异位催化热解产气的比较
DOI：
10.1016/j.jaap.2018.09.003
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发表时间：
2018-10-01
影响因子：
6
通讯作者：
Zhu, Li
中科院分区：
文献类型：
--
作者：
Huo, Xiaodong;Xiao, Jun;Zhu, Li
在两级固定床反应器中，比较了镍基和铜基催化剂对锯末的原位和非原位催化热解（CP）。碱金属K和碱土金属Mg被用于改性催化剂以进行比较。对于所有催化剂，非原位构型在减少焦油同时增加气体产量方面起着更主导的作用。还原态Ni的催化活性最高，为36.4vol. %的氢气，产率为13.6 mmol/g-bio在异位CP。随着温度的升高，非原位催化裂化比原位催化裂化对提高气产率和降低液产率的作用更明显。钾的变质效果优于镁，气体产物的产率较高。TG和拉曼光谱分析表明，K的加入降低了催化剂上的积炭量，使积炭更容易去除。
In this work, in-situ and ex-situ catalytic pyrolysis (CP) of sawdust by Ni-based and Cu-based catalysts are compared in a two-stage fixed bed reactor. Alkali metal K and alkaline earth metal Mg are used to modify the catalysts for comparison. The ex-situ configuration plays a more dominant role in reducing tar while increasing gas production for all catalysts. Reduced Ni shows the best catalytic activity for hydrogen production, obtaining 36.4 vol.% of hydrogen with a yield of 13.6 mmol/g-bio in ex-situ CP. With the increase of temperature, ex-situ CP has a more significant effect on improving gas product and reducing liquid product than in-situ CP. K presents better modification effect than Mg, resulting in a higher yield of gaseous products. Also, TG and Raman analysis indicate that K can decrease the amount of coke deposition on catalysts and make the coke easier to be removed.