Abstract A commercial equilibrium FCC catalyst of the octane-barrel type was subjected to lixiviation treatments with both acidic (HNO3) and basic (NaOH) solutions in order to modify its textural and acidic properties. The alkaline lixiviation doubled the mesopore volume in the commercial catalyst, while the acidic treatment increased the concentration of crystalline component in the catalyst. The catalytic performances of the parent and modified catalysts in the immediate conversion of vapors from pine sawdust fast pyrolysis were evaluated in a fixed bed reactor at 550 °C using mass catalyst to bio-oil and tar ratios from 3 to 8. The modified catalysts both produced more hydrocarbons and less coke than the parent commercial catalyst. In turn, comparing the modified samples, the one subjected to alkali treatment was more effective in deoxygenating the pyrolysis vapors, resulting in higher hydrocarbon yields (up to 13.2%) and lower coke yields than the acid modified catalyst, a fact assigned to the higher mesoporosity which improves the diffusion transport of bulky coke precursor molecules. The acid modified catalyst allowed a higher extension of the reaction pathway, the selectivity to aromatic hydrocarbon products being much higher (up to 95.5% of hydrocarbons in the gasoline boiling range).

中文翻译：

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平衡 FCC 催化剂以改善生物质热解的液体产品

摘要 使用酸性 (HNO3) 和碱性 (NaOH) 溶液对一种商业平衡的辛烷桶型 FCC 催化剂进行浸出处理，以改变其结构和酸性特性。碱性浸出使商业催化剂中的中孔体积加倍，而酸性处理增加了催化剂中结晶组分的浓度。在固定床反应器中，在 550 °C 下使用质量催化剂与生物油和 3 至 8 的焦油比评估母体和改性催化剂对松木屑快速热解蒸气的立即转化的催化性能。比母体商业催化剂产生更多的碳氢化合物和更少的焦炭。反过来，比较修改后的样本，与酸改性催化剂相比，经过碱处理的催化剂对热解蒸气的脱氧更有效，从而导致更高的烃产率（高达 13.2%）和更低的焦炭产率，这一事实归因于更高的介孔率，这改善了大体积催化剂的扩散传输。 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ?焦炭前体分子。酸改性催化剂允许反应途径的更高扩展，对芳烃产物的选择性要高得多（汽油沸程中高达 95.5% 的烃）。