Preparation of KI/Hydroxyapatite Catalyst from Phosphate Rocks and Its Application for Improvement of Biodiesel Production.

[ 12 ], where the surface area of the catalysts was 4.02–30.74 m 2 /g with a decreasing trend along with rising sintering temperature and K 2 CO 3 loading as it was covered with K compound. 3.4.

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For the KI/HAP catalyst, the yield and % FAME showed an increasing trend up to 5% concentration; however, it decreased when the impregnation concentration was increased to 6%.

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