Hydroformylation of 1-Hexene over Rh/Nano-Oxide Catalysts

Abstract

Abstract:The effect of nanostructured supports on the activity of Rh catalysts was studied by comparing the catalytic performance of nano-and bulk-oxide supported Rh/ZnO, Rh/SiO 2 and Rh/TiO 2 systems in 1-hexene hydroformylation. The highest activity with 100% total conversion and 96% yield of aldehydes was obtained with the Rh/nano-ZnO catalyst. The Rh/nano-ZnO catalyst was found to be more stable and active than the corresponding rhodium catalyst supported on bulk ZnO. The favorable morphology of Rh/nano-ZnO particles led to an increased metal content and an increased number of weak acid sites compared to the bulk ZnO supported catalysts. Both these factors favored the improved catalytic performance. Improvements of catalytic properties were obtained also with the nano-SiO 2 and nano-TiO 2 supports in comparison with the bulk supports. All of the catalysts were characterized by scanning electron microscope (SEM), inductively coupled plasma mass spectrometry (ICP-MS), BET, powder X-ray diffraction (PXRD) and NH 3 -temperature-programmed desorption (TPD).

Synthesis and Characterization of Rh/B–TNTs as a Recyclable Catalyst for Hydroformylation of Olefin Containing –CN Functional Group

“…One effective method is to “heterogenize” homogeneous catalysts. That is, the homogeneous catalyst, or the metal nanoparticles catalyst, is riveted on the materials of a large surface area [ 8 , 9 , 10 , 11 , 12 , 13 , 14 ]. Compared with conventional inorganic supports, the TiO 2 nanotubes (TNTs) with multi-hydroxyls on the inner and outer surface can support the nanosized catalytic activity center, e.g., Rh nanoparticles.…”

Selective extraction of supported Rh nanoparticles under mild, non-acidic conditions with carbon monoxide

“…The ability to recover the support is economically attractive when highly engineered supports are used such as carbon nanotubes and other nanoshaped structures. 40–42 …”

Alkali and Alkaline Earth Cation-Decorated TiO2 Nanotube-Supported Rh Catalysts for Vinyl Acetate Hydroformylation

“…Hydroformylation is a classic reaction to produce aldehydes, alcohols or carboxylic acids which are versatile intermediates and building blocks for pharmaceuticals, commodity and fine chemicals [1][2][3][4]. Consequently, researchers have been made much effort to increase the reaction rate of hydroformylation and the selectivity of aldehyde over the past years [5,6]. Up to now, the hydroformylation of functionalized terminal olefin, such as vinyl acetate, is still a charming topic since its functional group may coordinate to the metal center [7,8].…”