Ni/TPC催化剂的制备、表征及在秸秆热解燃气重整中的应用

以废弃汽车外轮胎热解后的副产物轮胎热解焦（Tyre pyrolysis char，TPC）为原料，利用均匀沉淀法制备以轮胎焦为载体的负载型Ni/TPC催化剂，采用EDX、SEM、XRD、TG、BET手段对催化剂进行了表征与分析，同时使用管式炉测试了Ni/TPC催化剂在秸秆热解燃气重整中的催化性能，并考察了热解温度、保温时间、镍负载量及催化时间对秸秆热解燃气重整效果的影响。研究结果表明，TPC富含焦和金属，Ni/TPC催化剂分散均匀，热稳定性好，比表面积为62 m²/g。催化剂活性测试显示，Ni/TPC催化剂用于作物秸秆热解燃气重整具有很强的催化活性，可显著提高燃气中可燃气体含量；热解温度在750℃、保温时间10 min、30%的Ni负载量时Ni/TPC催化剂的催化效率最高，连续使用850 min后，燃气中的H₂含量仍相对提高到50%以上，长时间使用后活性结构由Ni₃ZnC_0.7转变成FeNi₃，催化活性依然较强且趋于稳定，TPC可以作为良好的新型镍基催化剂载体。

Preparation and characterization of Ni/TPC catalyst and applied in straw pyrolysis gas reforming

Tire pyrolysis char (TPC) was used as a carrier to prepare Ni/TPC catalyst by homogeneous precipitation method. The characteristic of synthetic catalyst was determined by EDX, SEM, XRD, TG and BET. Meanwhile, the performance of Ni/TPC catalyst including reforming temperature, holding time, nickel loading and usage time on the straw pyrolysis gas reforming was investigated in a tube furnace. The results showed that TPC was rich in char and metal. Ni was well loaded on TPC which had a good thermal stability with a specific surface area of 62 m²/g. The Ni/TPC catalyst could obviously improve the burning gas content. The highest catalytic efficiency was obtained at reforming temperature of 750°C and 10 min holding time with 30% Ni loading. The content of H₂ in the gas was high and relatively increased by 50% after using the catalyst for 850 min. The Ni₃ZnC_0.7 active component structure converted to FeNi₃ after long-term used with high and stable catalytic activity. TPC had the ability to be a new type of carrier for nickel catalyst.