Wang Ruifeng, Chen Lungang, Zhang Xinghua, Zhang Qi, Li Yuping, Wang Chenguang, Ma Longlong
Nano Science and Technology Institute, University of Science and Technology of China Suzhou 215123 P. R. China.
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences Guangzhou 510640 P.R. China
RSC Adv. 2018 Dec 7;8(71):40989-40995. doi: 10.1039/c8ra07938b. eCollection 2018 Dec 4.
Novel catalytic material with high catalytic activity and hydrothermal stability plays a key role in the efficient conversion of levulinic acid (LA) to γ-valerolactone (GVL) in water. In this study, mixed oxides AlO-TiO, AlO-MoO and AlO-CoO were synthesized by co-precipitation using aqueous solution of NaOH as precipitant. Ru catalysts supported on mixed oxides were prepared by impregnation method and their catalytic performances were tested in the hydrogenation of LA to GVL on a fixed bed reactor. The physicochemical properties of the catalysts were characterized by XRD, H-TPR, NH-TPD, and BET techniques. The TiO component significantly affected the acidity of the catalyst, and thus its catalytic activity for the GVL yield was affected. The desired product GVL with a yield of about 97% was obtained over the Ru/AlO-TiO catalyst under mild conditions (WHSV = 1.8 h, = 80 °C). Moreover, the catalyst Ru/AlO-TiO exhibited excellent thermal stability in the test period of time.
具有高催化活性和水热稳定性的新型催化材料在水中将乙酰丙酸（LA）高效转化为γ-戊内酯（GVL）的过程中起着关键作用。在本研究中，以NaOH水溶液为沉淀剂，通过共沉淀法合成了混合氧化物AlO-TiO、AlO-MoO和AlO-CoO。采用浸渍法制备了负载在混合氧化物上的Ru催化剂，并在固定床反应器中测试了它们在LA加氢制GVL反应中的催化性能。通过XRD、H-TPR、NH-TPD和BET技术对催化剂的物理化学性质进行了表征。TiO组分显著影响了催化剂的酸度，进而影响了其对GVL产率的催化活性。在温和条件下（WHSV = 1.8 h， = 80 °C），Ru/AlO-TiO催化剂上获得了产率约为97%的目标产物GVL。此外，Ru/AlO-TiO催化剂在测试时间段内表现出优异的热稳定性。
