Catalytic Conversion of Biomass Pyrolysis Vapours over Sodium‐Based Catalyst: A Study on the State of Sodium on the Catalyst
Catalytic Conversion of Biomass Pyrolysis Vapours over Sodium‐Based Catalyst: A Study on the State of Sodium on the Catalyst
复制标题
钠基催化剂催化转化生物质热解蒸气：催化剂上钠状态的研究
DOI：
10.1002/cctc.201500236
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发表时间：
2015
期刊：
影响因子：
4.5
通讯作者：
K. Seshan
中科院分区：
文献类型：
--
作者：
Tang Son Nguyen;L. Lefferts;Karthick Babu Sai Sankar Gupta;K. Seshan
在实验室规模的固定床反应器中，在500 °C下研究了Na 2CO 3/γ-Al 2 O3催化剂上的生物质热解蒸气的原位改质。与非催化油相比，催化油表现出显着的改进，例如更低的氧含量（12.3重量%，而非42.1重量%），更高的能量密度（37.0，而非19.0 MJ kg−1）和更低的酸度。 使用热重-质谱分析和23 Na和1H魔角旋转NMR技术的研究揭示了催化剂中新钠物种的形成，这是高催化活性的原因。该物种是由Na+离子与γ-Al 2 O3表面的羟基配位形成的。催化剂的再生在空气中在600 °C下进行，并且再生的材料显示出比新鲜催化剂更低的脱氧活性。这种失活可能归因于再生过程中活性钠物质的变化。
In situ upgrading of biomass pyrolysis vapours over Na2CO3/γ‐Al2O3 catalysts was studied in a laboratory‐scale fixed‐bed reactor at 500 °C. Catalytic oil exhibits a significant improvement over its non‐catalytic counterpart, such as lower oxygen content (12.3 wt % compared to 42.1 wt %), higher energy density (37.0 compared to 19.0 MJ kg−1) and lower acidity. A study using thermogravimetry–mass spectrometry analysis and 23Na and 1H magic‐angle spinning NMR techniques has revealed the formation of a new sodium species in the catalyst, which is responsible for the high catalytic activity. This species is proposed to be formed by the coordination of Na+ ions and the hydroxyl groups on the surface of γ‐Al2O3. Regeneration of the catalyst was performed in air at 600 °C and the regenerated material displays lower activity towards deoxygenation than the fresh catalyst. This deactivation is likely attributed to the change in the active sodium species during regeneration.