Preparation of nickel-loaded on lignite char for catalytic gasification of biomass
Preparation of nickel-loaded on lignite char for catalytic gasification of biomass
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DOI：
10.1016/j.fuproc.2014.07.024
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发表时间：
2015-08
影响因子：
7.5
通讯作者：
Bengao Wang;Jingpei Cao;Xiao-Yan Zhao;Y. Bian;Chong-Whan Song;Yun-Peng Zhao;Xing Fan;Xianyong Wei-Xi
中科院分区：
文献类型：
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作者：
Bengao Wang;Jingpei Cao;Xiao-Yan Zhao;Y. Bian;Chong-Whan Song;Yun-Peng Zhao;Xing Fan;Xianyong Wei-Xi
以胜利褐煤半焦为载体，采用离子交换法负载镍，制备了一种新型催化剂。结果表明，催化剂的镍晶粒尺寸（NCS）和比表面积（SSA）显著依赖于溶液pH值和碳化温度。在pH 11和650 °C下制备的催化剂达到236.3m2/g的最大SSA，并且镍颗粒相当好地分散在催化剂中，NCS为5.6nm。在两段固定床反应器中，将该催化剂用于玉米芯挥发分重整反应，研究了温度、水蒸气和空速对气体产率和碳分布的影响。在650 °C惰性气氛下，Ni/Al 2 O3催化剂有效地提高了焦油的分解率，生成无焦油合成气，产率为43.9 mmol/g，高于工业Ni/Al 2 O3催化剂。在高于650 °C的催化重整过程中NCS的增加导致用于焦油分解的催化剂失活。该研究揭示了使用Ni/半焦作为生物质低温气化的潜在催化剂的可能性。
A novel catalyst was prepared by loading nickel on Shenli lignite char via ion-exchange. The results show that the nickel crystallite size (NCS) and specific surface area (SSA) of the catalyst significantly depended on solution pH and carbonization temperature. The catalyst prepared in pH 11 at 650 °C reached the maximum SSA of 236.3 m2/g and the nickel particles dispersed quite well in the catalyst with a NCS of 5.6 nm. The catalyst was used for corncob volatiles reforming in a two-stage fixed-bed reactor to study the effects of temperature, steam, and space velocity on gas yields and carbon distributions. It effectively improved tar decomposition at 650 °C under inert atmosphere and produced a tar-free syngas in a yield of 43.9 mmol/g, which is higher than that over a commercial Ni/Al2O3. The increase of the NCS during catalytic reforming above 650 °C leads to the catalyst deactivation for tar decomposition. The study revealed the possibility of using Ni/char as a potential catalyst for low-temperature gasification of biomass.