镍基整体式催化剂上生物质粗燃气重整调变的特性研究

采用浸渍法制备了Ni基整体式催化剂,考察了不同条件(温度、时间、空速、水蒸气添加等)对催化剂上生物质粗燃气重整反应性能的影响。结果表明,催化剂在较低温度下(≤500 ℃)只具有CO加氢反应活性,随着反应温度的升高粗燃气重整反应逐渐进行,在800 ℃以上,CH₄和C₂转化率均高达95 %以上,CO₂转化率达到92%,但随着反应空速和水蒸气添加量的增加,CH₄和CO₂等转化率呈现缓慢降低的趋势。此外,通过改变水蒸气添加量可对合成气中H₂/CO体积比在0.85~4.00进行较好调节。结合XRD表征发现,Ni基整体式催化剂中Ni°的生成可较好地促进重整反应的进行。

Reforming and adjustment of biomass fuel gas over Ni-based monolithic catalyst

The Ni-based monolithic catalyst was prepared by impregnation method.The performance of the catalyst on biomass fuel gas reforming was investigated by varying the reaction temperature,space velocity,steam addition and time-on-stream.Results show that the Ni-based monolithic catalyst exhibited only CO hydrogenation activity as the reaction temperature is lower than 500 ℃.With the increase in reaction temperature,the reforming activity increased gradually.The CH4 or C2 conversion was above 95%,and CO2 conversion was about 92 % over the catalyst at higher temperature(≥800 ℃).However,increasing space velocity and the addition of water steam resulted slightly in the decrease of reforming activity.Additionally,with increasing water steam content the H2/CO volume ratio in synthesis gas increased gradually from 0.85 to 4.00.According to the characteristic of X-ray diffraction,it was found that the formation of Nio could promote well the reforming reaction.