生物质焦油组分甲苯在镍/凹凸棒石上的二氧化碳催化重整

 以大比表面积的天然纳米矿物材料凹凸棒石 (PG) 为载体, 采用等体积浸渍法制备了 Ni/PG 催化剂. 运用 X 射线衍射、透射电镜和 CO₂ 程序升温脱附对 Ni/PG 催化剂进行了表征, 并用于以甲苯为生物质焦油模型化合物的 CO₂ 催化重整反应. 考察了反应温度、CO₂ 浓度以及催化剂中 Ni 负载量对甲苯与 CO₂ 重整性能的影响. 结果表明, 吸附在催化剂表面的 CO₂ 存在三个脱附峰, 其中高温脱附 CO₂ 与反应密切相关; 随着 CO₂ 浓度、Ni 负载量和反应温度的增加, 甲苯转化率和 H₂ 产率升高. 在 800 ^oC, CO₂/PhCH₃ 摩尔比为 0.2~0.26 时, 甲苯转化率达最高; 而在 CO₂/PhCH₃ 摩尔比为 0.2 时, H₂ 产率最高. 催化剂上积炭量随 CO₂ 浓度的增加和反应温度的升高而显著降低.

CO2 Reforming of Toluene from Biomass Tar over Ni/Palygorskite Catalyst

A nickel catalyst supported on palygorskite (PG) with large surface area was prepared by equal volume impregnation. Catalytic reforming of biomass tar over Ni/PG was studied using toluene as the model compound in the presence of CO₂. X-ray diffraction, transmission electron microscopy and CO₂-temperature programmed desorption were used to characterized the catalyst samples. The influence of CO₂ amount, reaction temperature, and Ni loading on toluene conversion, hydrogen yield, and carbon deposit was investigated. The results showed that three desorption peaks of CO₂ appeared on both PG and the Ni/PG catalyst. The toluene conversion and H₂ yield increased with the increase in the amounts of CO₂ and Ni content as well as the reaction temperature. At 800 oC and CO₂/PhCH₃ molar ratio of 0.2–0.26, the toluene conversion was the highest; the H2 yield reached the highest at CO₂/PhCH₃ molar ratio of 0.2. Carbon deposition decreased with increasing the CO₂ amount and reaction temperature.