Imroatul Qoniah
Department of Chemistry, Sepuluh Nopember Institute of Technology (ITS), Jl. Arief Rahman Hakim, Sukolilo, Surabaya 60111

Published : 6 Documents

Found 6 Documents

Condensation of Indole with Isatin over AlCl3/Mesoporous Aluminosilicate Purbaningtias, Tri Esti; Prasetyoko, Didik; Bahruji, Hasliza; Zein, Yusuf Muhammad; Triwahyono, Sugeng; Fadlan, Arief; Qoniah, Imroatul
Indonesian Journal of Chemistry Vol 15, No 1 (2015)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (365.91 KB) | DOI: 10.22146/ijc.21224


Aluminium chloride immobilized on mesoporous aluminosilicate was investigated as catalysts in the condensation of isatin with indole. AlCl3/mesoporous aluminosilicate (AlCl3/AM) catalysts were prepared by impregnation of 1, 5, 10 and 15 wt% AlCl3 on the surface of mesoporous aluminosilicate. A maximum conversion of isatin was achieved using 15% AlCl3/AM catalyst whereas the highest selectivity of 68.97% towards trisindoline was obtained using pure AM. The activity of the catalysts was depended on their acid site number and surface area. The number of Brønsted acid and the surface area affected to the conversion of isatin while the total acidity and the number of Lewis acid influenced the selectivity.
Calcium Oxide from Limestone as Solid Base Catalyst in Transesterification of Reutealis trisperma Oil Suprapto, Suprapto; Fauziah, Tikha Reskiani; Sangi, Meiske S; Oetami, Titie Prapti; Qoniah, Imroatul; Prasetyoko, Didik
Indonesian Journal of Chemistry Vol 16, No 2 (2016)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (323.589 KB) | DOI: 10.22146/ijc.21165


CaO catalysts were synthesized from limestone by thermal decomposition and coprecipitation methods. The CaO and MgO reference catalysts were also synthesized for comparison. The catalysts were characterized by X-ray diffractometer (XRD) and the analysis result was refined by Rietica software. CaO catalyst obtained by coprecipitation method has higher purity of CaO and lower MgO content than those of calcined CaO. The catalysts were also characterized by Fourier Transform Infrared (FTIR) spectroscopy. FTIR spectra showed that the catalysts can be easily hydrated and carbonated in air. The catalytic activity of the catalyst was studied in transesterification reaction of Reutealis trisperma (Kemiri Sunan) oil with methanol. Transesterification reaction was carried out at oil to methanol molar ratio 1:1 and 1% of catalyst at 60 °C for 2 h. Catalytic activity of CaO catalyst obtained by coprecipitation was higher than calcined CaO. The methyl ester yield obtained from synthesized CaO, CaO from coprecipitation, calcined CaO, and synthesized MgO catalysts were 56.13; 37.74; 15.97; and 3.61%, respectively.
Biodiesel Production from Waste Palm Oil Catalyzed by Hierarchical ZSM-5 Supported Calcium Oxide Zein, Yusuf Muhammad; Anal, Anil Kumar; Prasetyoko, Didik; Qoniah, Imroatul
Indonesian Journal of Chemistry Vol 16, No 1 (2016)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (256.621 KB) | DOI: 10.22146/ijc.21184


Biodiesel production from waste palm oil catalyzed by hierarchical ZSM-5 supported calcium oxide was studied. The activity of CaO increased after supported on h-ZSM-5 resulting an increase in conversion from 93.17% to 95.40%. A maximum conversion of 95.40% was achieved at 6 h reaction time, 3 wt.% catalyst amount, 12:1 methanol to oil molar ratio and 65 °C reaction temperature. The waste palm oil showed a high potential as a feedstock in biodiesel production in which there was no significant different in the conversion of fresh and waste palm oil. The properties of the obtained biodiesel required the limits of biodiesel specification according to ASTM D6751-08 and EN 14214 with the methyl ester content of 97.18%, the acid value of 0.24 mg KOH/g, the kinematic viscosity of 4.64 cSt and the density of 869.9 kg/m3.
Direct Synthesis of Sodalite from Indonesian Kaolin for Adsorption of Pb2+ Solution, Kinetics, and Isotherm Approach Wahyuni, Tri; Prasetyoko, Didik; Suprapto, Suprapto; Qoniah, Imroatul; Bahruji, Hasliza; Dawam, Ahmad Anwarud; Triwahyono, Sugeng; Jalil, Aishah Abdul
Bulletin of Chemical Reaction Engineering & Catalysis 2019: BCREC Volume 14 Issue 3 Year 2019 (SCOPUS and Web of Science Indexed, December 2019)
Publisher : Department of Chemical Engineering - Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (71.528 KB) | DOI: 10.9767/bcrec.14.3.2939.502-512


Indonesian kaolin was used as precursor for synthesis of sodalite. Synthesis parameters were optimized by varying the Si/Al ratios, stirring and aging conditions, and water composition. X-ray diffraction (XRD), Fourier Transform Infra Red (FTIR), Scanning Electron Microscope-Energy Dispersive X-ray (SEM-EDX), and Particle Size Analyzer (PSA) were used to characterize sodalite. The potential of sodalite as adsorbent for heavy metal Pb2+ ions removal from waste water was investigated in this work. The uptake adsorption capacities of sodalite was 90-100 mg/g from synthesized sodalite crystallized for 24 and 48 hours, and commercial silica. The kinetic of Pb2+ adsorption was a pseudo second order reaction and the adsorption coefficients was followed Langmuir adsorption isotherm. Copyright © 2019 BCREC Group. All rights reserved
Selective Hierarchical Aluminosilicates for Acetalization Reaction with Propylene Glycol Hartati, Hartati; Santoso, Mardi; Nur, Hadi; Loon, Leaw Wai; Bahruji, Hasliza; Qoniah, Imroatul; Prasetyoko, Didik
Indonesian Journal of Chemistry Vol 19, No 4 (2019)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (90.112 KB) | DOI: 10.22146/ijc.40106


Hierarchical micro-mesoporous aluminosilicates nanoparticles were synthesized at different of Si/Al ratios and were directly used as a solid acid catalyst for acetalization reaction with propylene glycol. TEM and N2 adsorption analysis of the resulting aluminosilicates revealed the formation of the hierarchical structure occurs on the Si/Al ratio increases the formation of mesoporous within the structure of aluminosilicate. The aluminosilicates exhibit high selectivity towards acetalization reaction in comparison with the homogeneous PTSA. The presence of mesoporous structures is crucial for increased conversion and selectivity of the reaction which presumably due to the improved diffusion of substrate to reach acid sites.
Reaktor Volume 16 No.1 Maret 2016
Publisher : Dept. of Chemical Engineering, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (503.686 KB) | DOI: 10.14710/reaktor.16.1.41-48


AMMOXIMATION OF CYCLOHEXANONE OVER Mo-IMPREGNATED TITANIUM SILICALITE USING HYDROGEN PEROXIDE AS AN OXIDANT. Ammoximation of cyclohexanone reaction using 1% MoO3/TS-1 catalyst have been made with hydrogen peroxide as an oxidant. Reaction carried out with the batch method using methanol and acetonitrile as solvent. Reaction products analyzed using gas chromatography. The 1% MoO3/TS-1 catalyst shows the highest activity than the TS-1. The increased of 1% MoO3/TS-1 catalytic activity due to hydrophilicity properties higher than TS-1. Reaction using methanol shows the highest activity compared with reactions using acetonitrile. The optimum calcination temperature for 1% MoO3/TS-1 catalyst to gives the highest activity is 400 ºC.   Keywords: ammoximation of cyclohexanone; TS-1; 1% MoO3/ TS-1 Abstrak Amoksimasi sikloheksanon menggunakan katalis 1% MoO3/TS-1 telah dilakukan dengan menggunakan hidrogen peroksida sebagai agen pengoksidasi. Reaksi dilakukan dengan metode batch menggunakan pelarut metanol dan asetonitril. Produk reaksi dianalisis dengan kromatografi gas. Katalis 1% MoO3/TS-1 menunjukkan aktivitas katalitik yang lebih tinggi daripada katalis TS-1. Peningkatan aktivitas katalitik 1% MoO3/TS-1 dikarenakan sifat hidrofilisitasnya lebih tinggi dibandingkan TS-1. Reaksi katalisis yang menggunakan pelarut metanol memberikan aktivitas katalitik lebih tinggi daripada reaksi yang menggunakan pelarut asetonitril. Suhu kalsinasi paling optimum pada katalis 1% MoO3/TS-1 untuk memberikan aktivitas katalitik tertinggi adalah 400ºC. Kata kunci: amoksimasi sikloheksanon; TS-1; 1 % MoO3/ TS-1