A two-phase system for the clean and high yield synthesis of furylmethane derivatives over –SO<sub>3</sub>H functionalized ionic liquids
作者:S. H. Shinde、C. V. Rode
DOI:10.1039/c7gc01654a
日期:——
respective ionic liquids. Among the several preapered ionic liquids, strong acidic imidazolium based butylsulfonic acid (6) showed the best activity with a maximum of 84% yield of condensation product. This strategy offers significantly highyield production of condensation products of furan and furfural as compared to the traditional mineral acid route. The activity and stability of the -SO3H functionalized
Alkylation of heteroarenes by using aldehydes is a direct approach to increase molecular complexity, which however often involves the use of stochiometric oxidant, strong acid, and high temperature. This study concerns an energy-efficient electrochemical alkylation of heteroarenes by using aldehydes undermildconditions without mediators. Interestingly, the graphite anode can trigger aldehyde cationic
Molybdenum Oxide-Modified Iridium Catalysts for Selective Production of Renewable Oils for Jet and Diesel Fuels and Lubricants
作者:Sibao Liu、Weiqing Zheng、Jiayi Fu、Konstantinos Alexopoulos、Basudeb Saha、Dionisios G. Vlachos
DOI:10.1021/acscatal.9b02693
日期:2019.9.6
alkanes. Catalyst characterization suggests that Ir is reduced to a fully metallic state to dissociate hydrogen for hydrogenation. Intact MoOx, partly covering the Ir metal surface, promotes ringopening, hydrogenolysis of etheric and alcoholic C–O bonds, and hydrogenation of C═O bonds. This study highlights the potential of low-cost metal–metal oxide catalysts with low loading of oxophilic metals to enable
负载型金属-金属氧化物逆催化剂由于对生物质基质有效的加氢脱氧(HDO)活性而受到了广泛的研究兴趣,但是报道的催化剂的高成本对商业化提出了挑战。我们介绍了一系列金属-金属氧化物催化剂的合成,Ir-MO x / SiO 2(M = Re,Mo,W,V或Nb)和M'-MoO x / SiO 2(M = Rh,Ru ,Pt或Pd)及其在多呋喃(高碳)基材上的HDO性能,以生产可再生的喷气燃料和柴油燃料以及润滑油基础油。MoO x改性的Ir / SiO 2催化剂,Mo / Ir比为0.13(Ir–MoO x / SiO 2)在温和的反应条件下表现出最高的产品收率(78-96%)。使用探针底物的对照实验表明,饱和和不饱和呋喃环的呋喃环氢化和C–O氢解作用是按顺序发生的。与底物或中间化合物的呋喃或饱和呋喃环相邻的碳原子会经历缓慢的C–C键断裂,从而产生一小部分较轻的烷烃。催化剂表征表明,Ir被还原为完全金属态以解离氢进行氢化。完整的MoO
Hydrodeoxygenation of Furylmethane Oxygenates to Jet and Diesel Range Fuels: Probing the Reaction Network with Supported Palladium Catalyst and Hafnium Triflate Promoter
作者:Saikat Dutta、Basudeb Saha
DOI:10.1021/acscatal.7b00986
日期:2017.8.4
Catalytichydrodeoxygenation of furylmethane oxygenates to highcarbon branched chain jet and diesel fuel rangealkanes under mild reaction conditions is a promising strategy for energy-efficient production of fuels with minimal C–C cracking to undesired products. Here, we report that a strong Lewis acidic promoter can overcome the energy barrier for furylmethanehydrodeoxygenation at lower temperature
在温和的反应条件下,将呋喃甲烷含氧化合物催化加氢脱氧成高碳支链喷气发动机和柴油燃料系列烷烃是一种有前景的策略,可实现高能效生产,并且对不希望有的产品进行最低程度的C-C裂解。在这里,我们报告说,强路易斯酸性助催化剂可以克服呋喃甲烷加氢脱氧在较低温度下的能垒。呋喃甲烷的呋喃环首先通过加氢催化剂加氢成完全饱和的环醚,然后使其容易地开环并通过促进剂进行脱氧。在开环步骤中,在助催化剂的三氟甲磺酸酯配体的协助下,在醚基O和路易斯酸性金属中心之间形成了一个环状中间体。用对称的单个呋喃环替代分子探测反应路径表明,启动子对于开环是必需的。单个呋喃环代用品比多个呋喃环呋喃基甲烷更快地发生开环含氧化合物的脱氧。最高97%的喷气燃料范围烷烃在C中的选择性为93%在最佳条件下由C 15-呋喃甲烷获得15 H 32和C 14 H 30。具有所需碳原子数的烷烃的收率和选择性可以使用具有定制碳链,呋喃原子数和最小化C-C裂解的碳中心的呋喃甲烷进行调整。