金属氧化物催化热解微晶纤维素

Catalytic pyrolysis of microcrystalline cellulose with metal oxides

详细研究了不同种金属氧化物(Al_2O_3、MgO和Ga_2O_3)对纤维素热解行为的影响。通过热重-红外光谱研究了添加不同金属氧化物后纤维素热解行为的变化,发现金属氧化物的加入使得微晶纤维素的最大失重速率降低,开始分解的温度前移,焦炭产率增加。在3种金属氧化物中,Al_2O_3有最为优秀的综合脱氧效果,而Ga_2O_3使得发生脱氧反应的温度区间变窄,但是脱除效率相对不高。通过热解-气相色谱/质谱分析了添加不同金属氧化物后纤维素热解产物分布的变化,结果表明,Al_2O_3对于呋喃类产物有很好的选择性,MgO促进了小分子产物的生成,Ga_2O_3提高了脱水糖产物的总产率。此外,Ga_2O_3的添加对于Al_2O_3和MgO的催化效果影响不同。

The effect of different metal oxides(Al2O3,MgO and Ga2O3)on the pyrolysis behavior of cellulose was investigated in detail.The change of the cellulose pyrolysis behavior before and after the addition of different metal oxides was investigated by TG-FTIR.It is found that the maximum weight loss rate of microcrystalline cellulose decreases with the addition of metal oxide,while the initial decomposition temperature and the coke yield increase.Of the three metal oxides,Al2O3 has the best deoxidation efficiency.Ga2O3 can make the temperature range of cellulose pyrolysis narrower,but the deoxidation efficiency is not high.The product distribution of cellulose pyrolysis after adding different metal oxides was analyzed by Py-GC/MS.The results show that Al2O3 has good selectivity for furan products,MgO promotes the formation of small molecular products,and Ga2O3 improves the total yield of anhydro sugar products.In addition,the addition of Ga2O3 has a different catalytic effect with Al2O3 and MgO.