de Menezes Anderson L, Souza Alvaro E C, Cerqueira Daniel A, Cardoso Cássia R, Vieira Luiz G M
Faculty of Chemical Engineering, Federal University of Uberlândia, Uberlândia, Minas Gerais 38408-100, Brazil.
Multicenter Chemistry Graduate Program of Minas Gerais State, Federal University of Triângulo Mineiro, Uberaba, Minas Gerais 38064-200, Brazil.
ACS Omega. 2025 Jun 30;10(27):29705-29720. doi: 10.1021/acsomega.5c03569. eCollection 2025 Jul 15.
The study aimed to evaluate the effect of HZSM-5 zeolite, HY-340 niobic acid, and torrefaction temperature on the deoxygenation of pyrolysis vapors from the catalytic pyrolysis of kraft lignin (493, 533, and 573 K) to produce aromatic hydrocarbons. The analytical pyrolysis (723, 823, and 923 K) of raw Kraft lignin at different catalyst/biomass ratios (1:1, 5:1, and 10:1) and without catalysts was performed. The pyrolysis vapor from analytical pyrolysis presented high levels of oxygenated compounds, mainly phenolics. The maximum production of phenolic compounds was 74% at 923 K for raw Kraft lignin. Catalytic analytical pyrolysis provided deoxygenation of pyrolysis vapors. HZSM-5 zeolite reached a maximum production of aromatic hydrocarbons of 57.84% with a catalyst/biomass ratio of 10:1 at 923 K. For HY-340 niobic acid, the production of aromatic hydrocarbons was 87.24 and 86.75% at 823 and 923 K, respectively, with a catalyst/biomass ratio of 10:1. The factorial experimental design showed that the maximum catalyst/biomass ratio provided the highest percentage of aromatic hydrocarbons (%HCA). For the HZSM-5 zeolite, the maximum %HCA was 41.95, 53.72, and 92.84% for torrefied lignin at 493, 533, and 573 K, respectively. For HY-340 niobic acid, the maximum %HCA values were 29.29, 50.02, and 90.02% at 493, 533, and 573 K. Fast pyrolysis in a bubbling fluidized bed reactor led to a higher production of phenolic compounds (78.15%) may be due to the longer residence time in the reactor. HZSM-5 zeolite and HY-340 niobic acid catalysts can promote deoxygenation reactions and increase the selectivity for aromatic hydrocarbons.
该研究旨在评估HZSM-5沸石、HY-340铌酸和焙烧温度对牛皮纸木质素催化热解（493、533和573K）产生的热解蒸汽脱氧以生产芳烃的影响。对不同催化剂/生物质比（1:1、5:1和10:1）且无催化剂的情况下的生牛皮纸木质素进行了分析热解（723、823和923K）。分析热解产生的热解蒸汽含有大量含氧化合物，主要是酚类。生牛皮纸木质素在923K时酚类化合物的最大产量为74%。催化分析热解实现了热解蒸汽的脱氧。HZSM-5沸石在923K、催化剂/生物质比为10:1时芳烃的最大产量为57.84%。对于HY-340铌酸，在823和923K、催化剂/生物质比为10:1时，芳烃产量分别为87.24%和86.75%。析因实验设计表明，最大催化剂/生物质比提供了最高的芳烃百分比（%HCA）。对于HZSM-5沸石，493、533和573K下经焙烧的木质素的最大%HCA分别为41.95%、53.72%和92.84%。对于HY-340铌酸，493、533和573K下的最大%HCA值分别为29.29%、50.02%和90.02%。在鼓泡流化床反应器中进行快速热解导致酚类化合物产量更高（78.15%），这可能是由于在反应器中的停留时间更长。HZSM-5沸石和HY-340铌酸催化剂可促进脱氧反应并提高对芳烃的选择性。
