石墨烯负载铜、金催化乙酰丙酸和对硝基苯甲醛加氢的研究

发布时间：2018-05-23 17:22

  本文选题：石墨烯 + 金负载石墨烯　； 参考：《大连理工大学》2016年硕士论文

【摘要】：石墨烯是碳原子通过sp2杂化以六元环形式平铺而成的二维蜂窝状碳纳米材料。由于石墨烯具有高比表面积,良好的电子传导性和导热性,其在催化领域的应用得到越来越多重视。本文以晶化石墨为原料,采用改进的Hummer法进行氧化、剥离得到氧化石墨烯,还原后即得到石墨烯；将铜、金元素分别负载于石墨烯上,制备相应的催化剂；对负载方法进行探索；并将其应用于不饱和化合物选择性催化加氢反应中。本文第一部分采用沉淀法制备Cu/rGO,以氧化石墨烯为前体,以氢氧化钠为沉淀剂将铜负载于氧化石墨烯表面,利用过量的氢氧化钠高温回流对氧化石墨烯进行一次还原,水热还原法进行二次还原。探索各种制备因素对催化剂活性的影响。将该催化剂应用于乙酰丙酸催化加氢反应,在温度为120℃,起始压力2 MPa条件下,反应2 h,产物γ-戊内酯的选择性达到100%。本文第二部分制备金石墨烯催化剂,将金溶胶与氧化石墨烯胶体混合后,在温度为110℃,起始压力3.5 MPa条件下进行氢气气氛下水热还原制备金石墨烯催化剂。探索各种制备因素对催化剂活性的影响。将还原好的催化剂进行洗涤后,应用于对硝基苯甲醛选择性催化加氢反应。在反应温度120℃,起始压力2 MPa,底物浓度为0.15moL/L,反应时间为2 h时,转化率达到100%时,对硝基苯甲醛选择性最高可以达到94.3%。
[Abstract]:Graphene is a two-dimensional honeycomb carbon nanomaterial composed of carbon atoms flattened in the form of six-member rings by sp2 hybridization. Because of its high specific surface area, good electronic conductivity and thermal conductivity, graphene has attracted more and more attention in the field of catalysis. In this paper, graphene oxide was obtained by the modified Hummer method, which was oxidized by crystalline graphite, and then the graphene was obtained after reduction, and the corresponding catalysts were prepared by loading copper and gold elements on graphene, respectively. The loading method was explored and applied to the selective catalytic hydrogenation of unsaturated compounds. In the first part of this paper, Cu / rGOA was prepared by precipitation method. With graphene oxide as precursor and sodium hydroxide as precipitant, copper was loaded on the surface of graphene oxide, and the graphene oxide was reduced by reflux of excess sodium hydroxide at high temperature. The secondary reduction was carried out by hydrothermal reduction. The effects of various preparation factors on the activity of the catalyst were explored. The catalyst was applied to the hydrogenation of levulinic acid. Under the conditions of 120 鈩，

本文编号：1925654