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Abstract：
The selective hydrogenation of the biomass platform molecule furfural (FAL) to produce furfuryl alcohol (FA) is of great significance to alleviate the energy crisis. Cu-based catalysts are the most commonly used catalysts, and their catalytic performance can be optimized by changing the preparation method. This paper emphasized the effect of calcination atmosphere on the performance of a Cu/Al2O3 catalyst for the selective hydrogenation of FAL. The precursor of the Cu/Al2O3 catalyst prepared by the ammonia evaporation method was treated with different calcination atmospheres (N2 and air). On the basis of the combined results from the characterizations using in situ XRD, TEM, N2O titration, H2-TPR and XPS, the Cu/Al2O3 catalyst calcined in the N2 atmosphere was more favorable for the dispersion and reduction of Cu species and the reduction process could produce more Cu+ and Cu0 species, which facilitated the selective hydrogenation of FAL to FA. The experimental results showed that the N2 calcination atmosphere improved the FAL conversion and FA selectivity, and the FAL conversion was further increased after reduction. Cu/Al2O3-N2-R exhibited the outstanding performance, with a high yield of 99.9% of FA after 2 h at 120 °C and an H2 pressure of 1 MPa. This work provides a simple, efficient and economic method to improve the C=O hydrogenation performance of Cu-based catalysts.
摘要：
生物质平台分子糠醛(FAL)选择性加氢制糠醇(FA)对缓解能源危机具有重要意义。铜基催化剂是最常用的催化剂，通过改变制备方法可以优化其催化性能。本文强调了煅烧气氛对FAL选择性加氢的Cu/Al2O3催化剂性能的影响。用不同的煅烧气氛(N2和空气)处理了通过氨蒸发法制备的Cu/Al2O3催化剂的前体。根据原位XRD表征的综合结果，TEM,N2O滴定，H2-TPR和XPS,在N2气氛中煅烧的Cu/Al2O3催化剂更有利于Cu物种的分散和还原，还原过程可以产生更多的Cu和Cu0物种，这促进了FAL选择性氢化为FA。实验结果表明,N2煅烧气氛提高了FAL转化率和FA选择性,还原后FAL转化率进一步提高。Cu/Al2O3-N2-R表现出优异的性能,在120°C和1MPa的H2压力下2小时后，FA的产率高达99.9％。这项工作提供了一个简单的,提高Cu基催化剂C=O加氢性能的方法。
