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KF supported catalyst and red mud in biodiesel synthesis Reactions

Author: LiuQiang
Tutor: XuChunLi
School: Shaanxi Normal University
Course: Physical and chemical
Keywords: KF Biodiesel Red mud Transesterification Catalytic mechanism
CLC: TE667
Type: Master's thesis
Year: 2011
Downloads: 75
Quote: 1
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Abstract


Biodiesel is a typical renewable energy, its research and utilization is received much attention. The design and preparation of catalysts is one of the research hotspot related to biodiesel. The contents of this thesis were divided into two sections. One section studied the catalytic performance and mechanism of KF-loaded catalysts for transesterification of triglyceride with methanol to produce biodiesel. The other section investigated possibility of red mud as a solid catalyst for using in biodiesel synthesis. The main research contents and conclusions were shown below:1. A number of KF-loaded heterogeneous base catalysts were prepared by doping KF on mixed oxide or single oxide supports containing Mg, Cu, Zn, Co, Al, Cr, Ni or Fe. The obtained catalyst was characterized using techniques of thermal analysis (TGA-DSC), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Hammett indicator, nitrogen physisorption and CO2 temperature-programmed desorption (CO2-TPD). The catalysts were tested for the transesterification of vegetable oil with methanol to produce biodiesel, in order to elucidate the active phase(s). The experimental results showed that KF doping increased activity irrespective of the nature of the support (i.e. whether it was mixed oxide or single oxide). For all catalysts, KOH formed during treatment of each support with KF, was demonstrated to be the active phase. The activity of KF doped catalysts is promoted by the surface F-species. On this basis, it is possible to rationalize the general effect that KF has in promoting base catalyzed activity and select suitable supports in the design of highly active KF-loaded catalysts.2. Waste red mud was investigated in triglyceride transesterification with a view to determine its possibility as a solid catalyst for use in biodiesel synthesis. The obtained catalyst was characterized using techniques of X-ray energy disperse spectrometer (EDS), XRD, TGA-DSC, nitrogen physisorption and CO2-TPD. Effect of calcination temperature on structure and activity of red mud catalysts was investigated. The effect factors, such as, methanol/oil molar ratio, catalyst amount, reaction time, and reusability of red mud catalysts were also examined. The experimental results showed that a 24:1 molar ratio of methanol to oil, addition of 4 wt% red mud catalysts (calcined at 200℃),65℃reaction temperatures gave the best results, and the biodiesel yield exceeded 98% at 3 h. Utilization of red mud as a catalyst for biodiesel production not only provides a cost-effective and environmental friendly way of recycling this red mud waste, significantly reducing its environmental effects, but also reduces the price of biodiesel to make biodiesel competitive with pretroleum diesel.

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CLC: > Industrial Technology > Oil and gas industry > Oil, natural gas processing industry > Synthetic oil > Extraction of oil from other raw materials
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