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Table 4. Effect of phenols on the product distribution. Reactant Guaiacol p-Cresol Conversion, % 100.0 93.0 m-Cresol 95.3 17.5 1.1 23.1 30.0 9.0 13.6 0.2 0.9 2.6 1.4 Alkanes Benzene Toluene p-/m-Xylene o-Xylene a PAB Phenol o-Cresol Xylenols b PAP Selectivity, % 33.8 27.3 6.6 1.3 14.4 18.0 21.3 22.2 6.2 6.7 11.2 14.4 0.6 0.6 1.6 1.4 2.0 5.0 1.4 2.4 a PAB is polyalkylated benzenes; b PAP is polyalkylated m-cresol (guaiacol and p-cresol)/methanol molar ratio Pt/Z-57D, W/F = 75 gcat ̈h/molphenols, reaction temperature = 673 K, carrier gas = H2, pressure = 2 MPa. As a result, although the conversion and product distribution have some difference from various kinds of phenolics with methanol, catalytic hydrodeoxygenation and methylation of lignin-derived model compounds can effectively generate p-/m-xylene. This result could be as a reference for direct conversion of lignin-derived model compounds (lignin phenols) with methanol. 3. ExperimentalSection 3.1. Materials m-Cresol (purity 99.7%, Aladdin, Shanghai, China), p-cresol (purity 99.0%, Aladdin, Shanghai, China), guaiacol (purity 99.0%, J&K, Tianjin, China), 2,4-xylenol (purity 99.0%, J&K, Tianjin, China), and methanol (purity 99.0%, J&K, Tianjin, China) were used as received. The HZSM-5 (SiO2/Al2O3 of 25, 57 and 107) and HBeta (SiO2/Al2O3 of 25) zeolites were purchased from Shanghai Novel Chemical Technology Co. Ltd. (Shanghai, China) and H2PtCl6 ̈ 6H2O as the active component precursor was obtained from Tianjin Guangfu Fine Chemical Research Institute (Tianjin, China). Other compounds (cyclohexane, toluene, o-xylene, m-xylene, p-xylene, phenol, 2,5-xylenol, 2,6-xyelnol, and 3,4-xylenol, GCS specifications) for identifying and calibrating products were also purchased from Tianjin Guangfu Fine Chemical Research Institute (Tianjin, China). Hydrogen (purity 99.96%) was obtained from Tianjin Six-Party Industrial Gases Co., Ltd. (Tianjin, China). 218 phenols; Reaction conditions: = 1/4, catalyst = 1.0 wt. %PDF Image | Zeolite Catalysis
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