Hydrogen production from the gasification of lignin with nickel catalysts in supercritical water
Hydrogen production from the gasification of lignin with nickel catalysts in supercritical water
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DOI：
10.1016/j.ijhydene.2006.08.001
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发表时间：
2007-05
影响因子：
7.2
通讯作者：
T. Furusawa;Takafumi Sato;H. Sugito;Yasutomo Miura;Yasuyoshi Ishiyama;Masahide Sato;N. Itoh;N. Suzuki
中科院分区：
文献类型：
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作者：
T. Furusawa;Takafumi Sato;H. Sugito;Yasutomo Miura;Yasuyoshi Ishiyama;Masahide Sato;N. Itoh;N. Suzuki
使用不锈钢管弹反应器在超临界水中用 Ni/MgO 催化剂气化木质素制氢。采用浸渍法制备Ni/MgO催化剂，并在773~1173K空气中焙烧8h。还原Ni/MgO催化剂的表征结果表明，煅烧后的催化剂被H2还原后形成Ni金属和NiO-MgO相。此外，通过CO化学吸附技术计算得到的Ni金属表面积随着煅烧温度的升高而降低。结果发现，除10wt% Ni/MgO (773K)催化剂外，气体产物的碳收率随着Ni金属表面积的增加而增加。因此，可以假设超临界水中木质素气化存在最佳的Ni粒径。值得注意的是，在测试的反应条件下，10wt% Ni/MgO (873K) 催化剂表现出最好的催化性能（碳收率 30%）。结论表明，Ni/MgO 催化剂是超临界水中木质素气化的一种有前景的系统。
Hydrogen production from the gasification of lignin with Ni/MgO catalysts in supercritical water was conducted using stainless steel tube bomb reactor. Ni/MgO catalysts were prepared by impregnation method and were calcined at 773–1173K in air for 8h. The results of characterization for reduced Ni/MgO catalysts showed that Ni metal and NiO–MgO phase are formed after the reduction of calcined catalyst by H2. Furthermore, Ni metal surface area, which was calculated by CO chemical adsorption technique, decreased with increase in calcination temperatures. It was found that the carbon yield of gas products was increased with increase in Ni metal surface area except 10wt% Ni/MgO (773K) catalyst. Thus, it can be supposed that there is an optimal Ni particle size for the gasification of lignin in supercritical water. It should be noted that 10wt% Ni/MgO (873K) catalyst showed the best catalytic performance (carbon yield 30%) under reaction condition tested. It was concluded that Ni/MgO catalyst is a promising system for the gasification of lignin in supercritical water.