Abstract

The influences of sugars (sucrose, fructose and glucose) on the performance of FeAl catalysts were investigated for CO₂ hydrogenation. FeAl catalysts were prepared with two steps. At first, the catalyst precursors were obtained by co-precipitation. During this step, three methods were used to add sucrose into the precursors. Then, promoter K and Cu were impregnated into the precursors. The improved CO₂ conversion and C₅₊ hydrocarbon selectivity by sucrose addition were attributed to the formation of γ-Fe₂O₃ phase in the catalyst precursor, which was different from the popular opinion that sucrose acted as a chelating agent. With the inspiration from sucrose hydrolysis effect, FeAl oxide, mainly in γ-Fe₂O₃ phase was prepared by adding fructose and glucose (the products of sucrose hydrolysis) into the newly centrifuged precipitate. The formation of γ-Fe₂O₃ phase was explained based on the results of XRD and XPS. The best catalyst possessed CO₂ conversion of 30.3% and C₅ + selectivity of 52.2% under the reaction conditions of H₂:CO₂ = 3:1, 6.0 L/(h·g-cat), 1.6 MPa and 235 °C.

Graphic abstract

中文翻译：

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糖对制备改进的FeAl二氧化碳加氢催化剂的影响

摘要

研究了糖（蔗糖，果糖和葡萄糖）对FeAl催化剂进行CO ₂加氢的性能的影响。FeAl催化剂分两步制备。首先，通过共沉淀获得催化剂前体。在此步骤中，使用了三种方法将蔗糖添加到前体中。然后，将助催化剂K和Cu浸渍到前体中。改进的CO ₂转化率和C ₅₊通过蔗糖除了烃的选择性归因于形成γ-的Fe ₂ Ó ₃在催化剂前体相，这是从蔗糖充当螯合剂流行的观点不同。受到蔗糖水解作用的启发，主要存在于γ-Fe中的FeAl氧化物通过将果糖和葡萄糖（蔗糖水解产物）添加到新离心的沉淀物中来制备₂ O ₃相。γ-Fe的形成₂ ö ₃根据XRD和XPS的结果相进行了说明。最好的催化剂 在H ₂：CO ₂  = 3：1、6.0 L /（h·g-cat），1.6 MPa和235°C的反应条件下具有30.3％的CO ₂转化率和52.2％的C ₅ +选择性。。

图形摘要