Ni /半焦催化甲苯水蒸气重整反应的稳定性研究

Study on the Stability of Ni/Biochar Catalyst for Catalytic Steam Reforming of Toluene

为了研究生物质半焦负载镍催化剂(Ni/BC)在甲苯(生物质焦油模型化合物)水蒸气重整反应过程中的稳定性,进行了100 h稳定性评价实验,并将其与Ni/ZrO2和Ni/γ-Al2O3等传统金属氧化物负载Ni催化剂进行对比,结果表明,Ni/BC稳定性优于Ni/ZrO2,但劣于Ni/γ-Al2O3催化剂。利用热重(TG)、X射线衍射仪(XRD)、透射电子显微镜(TEM)等分析手段对反应前后的催化剂进行表征,结果表明,反应后Ni/BC催化剂表面积碳量高于Ni/ZrO2和Ni/γ-Al2O3,且镍颗粒烧结严重,但是由于半焦具有较大的比表面积以及多孔结构,能够提供较多的活性位点,增强了催化剂的容炭能力。

In order to study the stability of biochar supported nickel(Ni/BC)catalyst during steam reforming of toluene(model compound of biomass gasification tar),the 100 h evaluation test was conducted and compared with traditional metal oxides(Ni/ZrO2 and Ni/γ-Al2O3).The stability of Ni/BC was better than that of Ni/ZrO2,but inferior to that of Ni/γ-Al2O3.Catalysts before and after reactions were characterized using thermogravimetry(TG),X-ray diffraction(XRD)and transmission electron microscopy(TEM).The results show that the coke deposition amount of Ni/BC catalyst after reaction was higher than that of Ni/ZrO2 and Ni/γ-Al2O3,and particle sintering was serious.However,Ni/BC had larger specific surface area and porous structure,which provided more active sites and enhanced the carbon tolerance capacity.