Synthesis of NiMo/La-Al2O3 powders for efficient catalytic transesterification of triglyceride with the high yield of 95.2.

Enhancement of the transesterification efficiency of triglyceride has come under heated study in biodiesel-making industry. In this research, the NiMo/La-Al2O3 nanopowders have been prepared for producing biodiesel efficiently. The screening test showed that the NiMo/La-Al2O3 catalyst has the best catalytic activity for triglyceride transesterification. Besides, the process parameters including reaction temperature, time, oil-to-alcohol ratio and catalyst loading etc., also have been investigated for optimization of the transesterification process. The results showed that with 5 wt% of catalyst loading, and oil to methanol molar ratio of 1:9, the conversion yield of triglyceride could be up to 95.2% within 120 min at 160°C. The NiMo/La-Al2O3 catalyst has the outstanding recycle property, which proved that the prepared NiMo/La-Al2O3 powders can be suitable for biodiesels' production.

[Feasibility of proton magnetic resonance spectroscopy of the myocardium in vivo].

OBJECTIVE: To investigate the feasibility of proton magnetic resonance spectroscopy ((1)H-MRS) of the myocardium in vivo. METHODS: A total of 100 volunteers were examined with 1H-MRS scan using a 1.5T MR scanner, and the magnetic resonance spectra were analyzed. RESULTS: All the volunteers completed the examinations, and the spectral peaks were identified with the chemical shifts of water (4.7 ppm), choline (3.2 ppm), creatine (3.0 ppm), and triglyceride (0.9-1.6 ppm), whose presentation ratios were 100%, 86%, 90%, and 98%, respectively. In 86 cases the spectra showed all the chemical shifts. The myocardial metabolite contents were expressed as the ratio of metabolites to water (%), and the contents of choline, creatine, and triglyceride were 1.94%, 1.95%, and 9.41%, respectively. CONCLUSION: (1)H-MRS can be used in detecting the metabolic products of myocardium in vivo.