Production of hydrogen by steam gasification from lignin with Al2O3·Na2O·xH2O/NaOH/Al(OH)3 catalyst
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摘要: 考察了催化剂Al2O3·Na2O·xH2O/NaOH/Al(OH)3催化木质素水蒸气气化制氢及其影响因素。结果表明,木质素气化的产氢速率随Na2O/C比值的升高而升高；木质素在较低的温度下气化时，较高的水蒸气流速有利于抑制CO和CO2的生成。产氢速率随水蒸气流速的增大而增大。催化剂中的铝酸钠水合物受热分解产生的水可导致催化剂中的NaOH组分产生更多的Na+和OH-离子。更多的Na+和OH-离子可使木质素中C—H键的键能更显著的降低。木质素在473K~973K气化的氢转化程度可达134.94%，这表明催化剂Al2O3·Na2O·xH2O/NaOH/Al(OH)3对木质素低温水蒸气气化制氢具有较好的催化活性。Abstract: Some influencing factors on hydrogen production from steam gasification of lignin with Al2O3·Na2O·xH2O/NaOH/Al(OH)3 catalyst in a fixed bed reactor were examined. The results show that the formation rates of hydrogen increase with increasing ratio of Na2O/C and ratio of vapor to lignin as a whole. Higher flow rate of vapor is conducive to inhibit the generation of CO and CO2 at lower temperature. H2O(g) produced by the hydrates contained in the catalyst can bring on more Na+ and OH- ions to be formed by dissociation of NaOH within the catalyst. This leads to more remarkable reduction of the C—H bond energies of lignin. The conversion degree of hydrogen of lignin at 473K~973K reaches 134.94%, which shows that the present catalyst has good catalytic activity on hydrogen production from steam gasification of lignin at low temperature.
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Key words:
- hydrogen production /
- catalytic steam gasification /
- lignin
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Su shen(1975-)， male， E-mail： sushen@sxicc.ac.cn, major in industrial catalysis -
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