CeO2对Ni-Cu/HZSM-5催化剂在生物油加氢脱氧反应中抗积炭性能的影响

摘要

The influence of CeO2 as an additive on the carbonaceous deposition behavior of Ni-Cu/H-ZSM-5 catalyst in the hydrodeoxygenation ( HDO ) of bio-oil was investigated. Various techniques such as thermogravimetric analysis ( TGA ) , X-ray photoelectron spectroscopy ( XPS ) , and Raman spectroscopy were used to elucidate the content and microstructure of carbon deposited on the catalyst surface, the transformation of various forms of carbon ( soft carbon, hard carbon and graphite) in HDO, and the kinetics of carbon deposition. The results indicate that the content of CeO2 added in the Ni-Cu based catalyst and the reaction temperature both have a significant influence on the carbon deposition behavior and the resistance against coking for HDO of bio-oil;for HDO over the Ni-Cu/HZSM-5 catalyst at 270 ℃, adding 15% CeO2 gives the Ni-Cu catalyst highest resistance against the carbon deposition.%将CeO2氧化物添加到Ni-Cu基催化剂中,研究了CeO2加入量对生物油加氢脱氧过程中催化剂表面积炭行为的影响.采用热重分析、X射线光电子能谱和拉曼光谱等对CeO2加入前后催化剂表面的积炭量、微结构、积炭动力学和不同类型炭(软积炭、硬积炭和石墨炭)的转变行为等进行了研究.结果表明,CeO2的添加量及反应温度对催化剂的抗积炭能力及积炭的类型均具有显著的影响;在反应温度为270℃、CeO2的添加量为15%时,Ni-Cu基催化剂抗积炭性能最好.