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采用两段式催化气化方式研究了生物质热解气化过程中碱金属的挥发对Ni基催化剂活性的影响。实验结果表明,负载K盐的纤维素水蒸气催化气化过程中,K挥发后会在催化剂表面沉积,而少量K的存在和表面沉积不但能够提高镍基催化剂的抗积炭能力,而且有助于提高其催化活性,产生更多的氢气。然而纤维素中K的浓度过大,将会抑制Ni基催化剂的效果;K在催化剂上的沉积随催化剂循环次数的增加而增加,K的含量愈高,对催化剂的抑制效果愈明显,从而缩短了催化剂的使用寿命。
The effect of alkali metal volatilization on the activity of Ni-based catalysts was studied by two-stage catalytic gasification. The experimental results show that during the catalytic gasification of K salt-loaded cellulose water vapor, K volatilizes and deposits on the catalyst surface. However, the presence and surface deposition of a small amount of K can not only improve the anti-carbon deposition ability of Ni-based catalysts, but also help To increase its catalytic activity, to produce more hydrogen. However, the concentration of K in cellulose is too large, which will inhibit the effect of Ni-based catalyst. The deposition of K on the catalyst increases with the increase of the number of catalyst cycles. The higher the content of K, the more pronounced the inhibition effect on the catalyst, The life of the catalyst.