Kalong Munsuree, Ratchahat Sakhon, Khemthong Pongtanawat, Assabumrungrat Suttichai, Srifa Atthapon
Department of Chemical Engineering, Faculty of Engineering, Mahidol University, Nakhon Pathom 73170, Thailand.
National Nanotechnology Center (NANOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand.
Nanomaterials (Basel). 2022 May 6;12(9):1578. doi: 10.3390/nano12091578.
Cu/CaO catalysts with fine-tuned Co-doping for excellent catalytic performance of furfural (FAL) hydrogenation to furfuryl alcohol (FOL) were synthesized by a facile wetness impregnation method. The optimal CoCu/CaO catalyst, with a Co to Cu mole ratio of 1.40:1, exhibited a 100% FAL conversion with a FOL yield of 98.9% at 100 °C and 20 bar H pressure after 4 h. As gained from catalyst characterizations, Co addition could facilitate the reducibility of the CoCu system. Metallic Cu, Co-Cu alloys, and oxide species with CaO, acting as the major active components for the reaction, were formed after reduction at 500 °C. Additionally, this combination of Co and Cu elements could result in an improvement of catalyst textures when compared with the bare CaO. Smaller catalyst particles were formed after the addition of Co into Cu species. It was found that the addition of Co to Cu on the CaO support could fine-tune the appropriate acidic and basic sites to boost the FOL yield and selectivity with suppression of undesired products. These observations could confirm that the high efficiency and selectivity are mainly attributed to the synergistic effect between the catalytically active Co-Cu species and the CaO basic sites. Additionally, the FAL conversion and FOL yield insignificantly changed throughout the third consecutive run, confirming a high stability of the developed CoCu/CaO catalyst.
采用简便的湿浸渍法合成了具有微调钴掺杂的Cu/CaO催化剂，用于糠醛（FAL）加氢制糠醇（FOL）的优异催化性能。最佳的CoCu/CaO催化剂，Co与Cu的摩尔比为1.40:1，在100℃和20巴氢气压力下反应4小时后，FAL转化率达到100%，FOL产率为98.9%。从催化剂表征结果可知，添加Co可促进CoCu体系的还原。在500℃还原后，形成了金属Cu、Co-Cu合金以及与CaO的氧化物物种，它们是该反应的主要活性成分。此外，与纯CaO相比，Co和Cu元素的这种组合可改善催化剂的织构。在Cu物种中添加Co后形成了更小的催化剂颗粒。研究发现，在CaO载体上向Cu中添加Co可以微调合适的酸性和碱性位点，以提高FOL的产率和选择性，同时抑制不需要的产物。这些观察结果可以证实，高活性和选择性主要归因于催化活性的Co-Cu物种与CaO碱性位点之间的协同效应。此外，在连续第三次运行中，FAL转化率和FOL产率变化不显著，证实了所开发的CoCu/CaO催化剂具有高稳定性。
