Muchalal Muchalal
Department of Chemistry, Universitas Gadjah Mada, Jln. Sekip Utara, Yogyakarta

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HIDROGENASI PULEGIL ASETAT DIKATALISIS Ni/Al2O3 Al Anshori, Jamaluddin; Muchalal, Muchalal
Jurnal Sains dan Terapan Kimia Vol 3, No 2 (2009)
Publisher : Jurnal Sains dan Terapan Kimia

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Abstract

Telah dilakukan hidrogenasi pulegil asetat dikatalisis Ni/-Al2O3 untuk mempelajariselektivitas katalis dan pengaruh durasi reaksi terhadap stereospesifitas katalis Ni/-Al2O3.Pulegil asetat diperoleh dari siklisasi sitronelal dengan anhidrida asam asetat dikatalisisZnCl2 pada temperatur 80 oC dan durasi reaksi 3 jam. Ni/-Al2O3 dipreparasi denganimpregnasi Ni(NO3)2.6H2O ke dalam -Al2O3, dilanjutkan dengan kalsinasi dan reduksi padatemperatur ±500 oC secara berturut-turut. Aktivitas katalis diujikan pada hidrogenasi padatemperatur 200 oC dan durasi reaksi 2, 4, 6, 8 dan 10 jam. Reaksi dilakukan denganmenambahkan 2,5 mL pulegil asetat dan 0,25 g Ni/-Al2O3 ke dalam reaktor hidrogenasi.Produk yang terbentuk diidentifikasi dengan metode spektroskopi. Reaksi menunjukkanbahwa selektifitas hidrogenasi terjadi pada ikatan rangkap C=C pulegil asetat menghasilkanmentil asetat dan neo-mentil asetat. Hasil optimal dari hidrogenasi katalitik diperoleh padatemperatur 200 oC dan durasi reaksi 10 jam. Stereospesifitas produk sebesar 61,08%terhadap mentil asetat dan 33,85% terhadap neo-mentil asetat.Kata kunci : hidrogenasi, pulegil asetat, mentil asetat, neo-mentil asetat, katalis Ni/-Al2O3
Catalytic Activities of Fe3+- and Zn2+-Natural Zeolite on the Direct Cyclisation-Acetylation of (R)-(+)-Citronellal Cahyono, Edy; Muchalal, Muchalal; Triyono, Triyono; Pranowo, Harno Dwi
Bulletin of Chemical Reaction Engineering & Catalysis 2014: BCREC Volume 9 Issue 2 Year 2014 (SCOPUS Indexed, August 2014)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.9.2.5936.128-135

Abstract

Characterisation and catalytic ativities investigation of modified natural zeolite on cyclisation acetylation reaction of (R)-(+)-citronellal was performed. The experimental work involved isolation of (R)-(+)-citronellal from Java Citronella oil (Cymbopogon winterianus) by vacuum fractional distillation, determination of its enantiomer, preparation and characterisation of different catalysts i.e. H-natural zeolite (H-Za), Fe3+-natural zeolite (Fe3+-Za), and Zn2+-natural zeolite (Zn2+-Za), followed by examination of catalytic activity and selectivity. Isolated citronellal contained 88.21% ee of (R)-(+)-citronellal. The main products of cyclisation-acetylation of (R)-(+)-citronellal was IPA (isopulegyl acetate) and NIPA (neo-isopulegyl acetate). Although the highest yield of IPA and NIPA was obtained by Fe3+-Za catalyst (78.69%) at 80oC and 120 min, the stereoselectivity of Fe3+-Za slightly lower than that of Zn2+-Za. Structure elucidation of citronellal and products was carried out by means of GC and GC-MS. Lewis acidity plays the role of acetyl ionic formation from acetic anhydride. The Activity and stereoselectivity of catalysts depended on Lewis acidity and cation distribution on the catalyst surface. © 2014 BCREC UNDIP. All rights reservedReceived: 18th December 2013; Revised: 9th April 2014; Accepted: 17th April 2014[ How to Cite: Cahyono, E., Muchalal, M., Triyono, T., Pranowo, H.D. (2014). Catalytic Activities of Fe3+- and Zn2+-Natural Zeolite on the Direct Cyclisation-Acetylation of (R)-(+)-Citronellal. Bulletin of Chemical Reaction Engineering & Catalysis, 9 (2): 128-135. (doi:10.9767/bcrec.9.2.5936.128-135) ][ Permalink/DOI: http://dx.doi.org/10.9767/bcrec.9.2.5936.128-135 ] 
PARALLEL REACTION ON CATALYTIC HYDROGENATION REACTION OF CIS-ISOEUGENOL INTO 2-METHOXY-4-PROPYLPHENOL Muchalal, Muchalal
Indonesian Journal of Chemistry Vol 5, No 2 (2005)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (192.413 KB) | DOI: 10.22146/ijc.21826

Abstract

Catalytic hydrogenation of eugenol (Mr 164) and isoeugenol (Mr 164) by using synthetic catalyst Ni/-Al2O3 had been carried out. Eugenol transformation into 2-methoxy-4-propylphenol (Mr 166) as a main product could be achieved in 100% and no conversion reaction of eugenol into isoeugenol. If the raw material was 96% trans-isoeugenol or 61% cis-isoeugenol then the product was 67% or 92% of 2-methoxy-4-propylphenol. On the catalytic hydrogenation of trans-isoeugenol into 2-methoxy-4-propylphenol there was no parallel reaction of trans-isoeugenol into cis-isoeugenol. Conversely, catalytic reaction of cis-isoeugenol into 2-methoxy-4-propylphenol always followed by conversion reaction of cis-isoeugenol into trans-isoeugenol. Transformation of cis-isoeugenol into 2-methoxy-4-propylphenol below 200 oC was equilibrium reaction and above 200 oC was an irreversible reaction.   Keywords: Catalytic hydrogenation, cis-isoeugenol
SYNTHESIS OF MENTHOL FROM PULEGOL CATALYZED BY Ni/-Al2O3 Anshori, Jamaludin Al; Muchalal, Muchalal; Sutarno, Sutarno
Indonesian Journal of Chemistry Vol 9, No 1 (2009)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1522.675 KB) | DOI: 10.22146/ijc.21567

Abstract

Synthesis of menthol using Ni/g-Al2O3 15% has been carried out started from pulegol as precursor. Structure elucidation of the products was achieved by GC-FID, GC-MS, FTIR, and 1H-NMR evidences. Isomers identification and their stability were determined by computational simulation. All experimental results were compared to the available literature. Ni/g-Al2O3 catalyst was prepared by wet impregnation with precursor of Ni(NO3)2, followed by calcinations and reduction respectively. Characterization of the catalyst was performed by XRD and AAS. Synthesis was started by mixing pulegols with catalyst and then swirled it with hydrogen gas. Reaction temperature and duration were varied in order to obtain high yield with good selectivity. The results showed that the optimum condition of Ni/g-Al2O3 catalytic hydrogenation of pulegol was achieved at 180 °C for 8 hours. The conversion of pulegol to menthol was 89% with stereo selectivity of 71% to (-)-menthol.   Keywords: menthol, pulegol, hydrogenation, Ni/g-Al2O3, impregnation
PREPARATION OF ACTIVATED CARBON FROM SILK COTTON WOOD AND COCONUT SHELL BY PYROLISIS WITH CERAMIC FURNACE Haryadi, Winarto; Muchalal, Muchalal; Cahyono, Robby Noor
Indonesian Journal of Chemistry Vol 5, No 2 (2005)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (191.669 KB) | DOI: 10.22146/ijc.21817

Abstract

Preparation of activated carbon from silk cotton wood and coconut shell has been done. Carbon was made by pyrolysis process in the Muchalal furnace with 3000 watt electric power. The electric power was increased gradually from 1000, 2000 and then 3000 watt with interval 2 hours during 7 hours. Carbon was activated in Muchalal furnace with 4000 watt electric power during 2 hours and flowed with nitrogen gas. Product of the activated carbon was compared to standart product with several analysis including the surface area, acetic acid adsorption, iod adsorption and vapour adsorption. The results of analysis showed that surface area for silk cotton wood carbon, coconut shell carbon, and E.Merck product were 288.8072 m2/g, 222.9387 m2/g and 610.5543 m2/g, respectively. Acetic acid adsorption for silk cotton wood carbon, coconut shell carbon, and standart product were 157.391 mg/g, 132.791 mg/g, and 186.911 mg/g, respectively. Iodine adsorption for cotton wood carbon, coconut shell carbon, and standart product were 251.685 mg/g, 207.270 mg/g and 310.905 mg/g, respectively. Vapour adsorption for cotton wood carbon, coconut shell carbon and standart product were 12%, 4%,and 14%., respectively Key words : Activated carbon, pyrolysis, Muchalal furnace