Fe2O3/Al2O3催化生物质裂解耦合稠油改质过程研究

针对稠油改质效果较差且易结焦等问题，提出了生物质裂解耦合稠油改质的新思路，考察了催化剂Fe₂O₃/Al₂O₃对生物质（微晶纤维素和废纸屑）裂解行为、生物质裂解耦合稠油改质过程的影响。结果表明：以Fe₂O₃/Al₂O₃作为催化剂，可以提高生物质裂解生物质油的产率，进一步降低改质稠油的黏度；在催化剂添加量（w）为0.4%（以稠油质量计）、反应温度为350 ℃和反应时间为30 min的条件下，纤维素、废纸屑裂解生物质油的产率分别为76.25%、65.26%。对于纤维素-稠油和废纸屑-稠油两种耦合体系，稠油改质后的降黏率分别达到74.14%和65.93%。改质前后稠油傅里叶变换红外光谱和族组成分析结果表明，耦合改质过程中，在生物质裂解产生的活性氢和Fe₂O₃共同作用下，稠油发生深度裂解，分子中C—C键和C—S键断裂，生成轻质组分。

STUDY ON CATALYTIC PERFORMANCE OF Fe2O3/Al2O3 IN BIOMASS PYROLYSIS COUPLED WITH HEAVY OIL UPGRADING PROCESS

Aiming at the poor upgrading effect of heavy oil and easy coking, a new idea of biomass pyrolysis coupled with heavy oil upgrading was proposed, and the catalytic effect of the catalyst Fe₂O₃/Al₂O₃ on biomass (microcrystalline cellulose and waste paper) pyrolysis behavior was investigated. The results show that the yield of biomass pyrolysis bio-oil is increased and the viscosity of the modified heavy oil is further reduced by using Fe₂O₃/Al₂O₃ as a catalyst. Under the conditions of a catalyst mass fraction of 0.4%,a reaction temperature of 350 ℃ and a reaction time of 30 min, the yields of cellulose and waste paper pyrolysis bio-oil were 76.25% and 65.26%, respectively. For the two coupling systems of cellulose-heavy oil and waste paper scraps-heavy oil, the viscosity reduction rate of the upgraded heavy oil was reached 74.14% and 65.93%, respectively. The results of FT-IR and SARA analysis before and after upgrading showed that the heavy oil was deeply cracked, and the C—C bonds and C—S bonds were broken under the action of the active hydrogen and Fe₂O₃, to produce light components.