Iqmal Tahir

Synthesis of Cr/Al2O3- Bentonite Nanocomposite as the Hydrocracking Catalyst of Castor Oil

Synthesis and characterization of Cr/Al2O3-bentonite nanocomposite as a hydrocracking catalyst of castor oil have been conducted. The catalyst was prepared according to the following method. At the first step, bentonite was activated using H2SO4 to obtain H-bentonite, after that the activated clay was pillarized by Al2O3, Next, a salt solution of Cr (NO3)3·9H2O was impregnated in the pillared bentonite sample, followed by calcination and reduction to obtain the final catalyst, i.e. Cr/Al2O3-bentonite. The catalysts including unpillared bentonite were characterized using infrared spectrometer (FT-IR), X-Ray diffractometer (XRD), X-ray Fluorescence spectrometer (XRF), Transmission Electron Microscope (TEM) and gas sorption analyzer. GC-MS analysis was conducted to characterize the hydrocracking product. The research results showed that pillarization of bentonite caused an increasing of the basal spacing of bentonite in an amount of 1.01 nm. Although Chrom was unevenly dispersed on the bentonite and it probably blocked the bentonite framework resulted in the decrease of catalyst specific surface area, Cr/Al2O3-bentonite catalyst gave the best conversion of 64.03%. The GC-MS analysis data showed that the hydrocracking products contained various kinds of organic compounds such as acetone, acetic acid, methyl benzene, octane, heptanal, 2-octene, 1-undecanoic acid, 9-octadecenal and 10-undecenoic acid.

OPTIMISASI RASIO DIAZINON/ASAM METAKRILAT SECARA TEORITIK BERDASARKAN METODA SEMIEMPIRIK AM1 UNTUK SINTESIS POLIMER TERCETAK MOLEKUL

Rasio optimum diazinon/asam metakrilat pada desain polimer tercetak molekul untuk aplikasi sensor diazinon berbasis quartz crystal microbalance telah ditentukan secara teoritik menggunakan perhitungan mekanika kuantum semiempirik AM1. Kajian ditentukan berdasarkan pemodelan molekul yang mempelajari interaksi non kovalen antara diazinon sebagai templat dan asam metakrilat sebagai monomer fungsional. Analisis dilakukan untuk mencari kestabilan komplek yang terbentuk dengan berdasarkan parameter energi interaksi antara diazinon dan asam metakrilat yang dilakukan dengan menggunakan perangkat lunak Hyperchem 7.5. Hasil penelitian menunjukkan pembentukan komplek stabil terjadi dengan melibatkan ikatan hidrogen. Untuk kompleks dengan energi interaksi optimum diperoleh dari komplek diazinon/asam metakrilat dengan rasio 1:3, yang kemudian direkomendasikan sebagai rasio mol optimum pada sintesis polimer tercetak diazinon. Kata kunci : diazinon, asam metakrilat, semiempirik AM1, polimer tercetak molekul, Quartz Crystal Microbalance