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All Journal Jurnal Fisika Unand Jurnal Riset Kimia Indonesian Journal of Chemistry
Admi Admi
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Universitas Andalas, Padang, Indonesia
Chemical Engineering, Chemistry & Bioengineering Chemistry Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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Sintesis dan Karakterisasi Enkapsulat Katalis Nikel (II) pada Silika Mesopori Modifikasi Admi Admi; Fitria Ramadhani; Syukri Syukri
Jurnal Riset Kimia Vol. 11 No. 2 (2020): September
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jrk.v11i2.356

Abstract

Ni(II)-BF3/MCM-41 was synthesized for heterogeneous catalyst. The boron trifluoride modified mesoporous silica BF3/MCM-41 was studied to investigate its ability as supporting agent in heterogeneous catalysis system. For this purpose, the structural directing agent remaining in as-synthesis MCM-41 removed by solvent extraction. Surface modification of mesoporous silica MCM-41 with aniline and boron trifluoride was carried out. Then, the surface of boron trifluoride modified mesoporous silica was subjected to an encapsulation with Ni(II) ions. These solid materials were characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and atomic absorption spectroscopy (AAS). In the FTIR spectra of the modified silica mesoporous, the presence of vibration band >Si-O-B confirm the success of modification of support. While, the shifting of the vibration band >Si-O-Si< is considered an indication of the proof of Ni(II) species onto the modified mesoporous silica. From the SEM photograph, it can be seen that the morphology of the Ni(II)-BF3/MCM-41 tend to form aggregates of smaller particles. Based on measurement of metal content by AAS, it was known that the value of metal loading is 33%. While for the leaching test, Ni(II)-BF3/MCM-41 lost only 0.014 % of Ni metal. It indicates the stability of the interaction between the N(II) and support of the modified mesoporous silica.
Synthesis and Characterization of Acetonitrile Ligated Cu(II)-Complex and Its Catalytic Application for Transesterification of Frying Oil in Heterogeneous Phase Rycce Sylviana Pratikha; Syukri Syukri; Admi Admi
Indonesian Journal of Chemistry Vol 13, No 1 (2013)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2320.538 KB) | DOI: 10.22146/ijc.21329

Abstract

Catalysts have played an important role in many industries because they allow the reaction occurs faster. The aim of this work were to synthesize and characterize a Cu(II)-acetonitrile complex immobilized on modified silica and to investigate its catalytic activity at optimal condition (catalyst concentration, stirring rate, and the duration of reaction) in transesterification of frying oil. Fourier Transform Infrared (FTIR) and Nano Laser-Particle Size Analyzer (NL-PSA) were used to characterized the catalyst obtained, metal loading and leaching of the copper content was measured by Atomic Absorption Spectroscopy (AAS) and the formation of product from transesterification reaction was analyzed by Gas Chromatography-Mass Spectroscopy (GC-MS). FTIR spectra reveal a successful synthesis of modified silica and the immobilized Cu(II)-acetonitrile complex on it. NL-PSA Analysis showed that the catalyst possesed smaller particle size than the parent silica. Analysis with AAS confirms the stable catalysts formed because metal loading and leaching value were of 6.19 and 0.16%, respectively. The optimum conditions were found to be 0.80% catalyst concentration, 300 rpm stirring rate and 10 h duration of reaction.
Pengaruh Modifikasi Fisika pada Komposisi, Struktur Kristal dan Sifat Katalitik Lempung Solok Admi Admi; Florencia Tri Angellika; Yetria Rilda; Syukri Syukri
Jurnal Fisika Unand Vol 11 No 4 (2022)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (367.308 KB) | DOI: 10.25077/jfu.11.4.548-555.2022

Abstract

Mineral lempung yang diperoleh dari Kabupaten Solok, Sumatera Barat, telah dimodifikasi secara fisika melalui pemanasan pada 105°C, 450°C dan 850°C. Aktivitas katalitiknya telah diuji dalam transesterifikasi minyak jelantah untuk menghasilkan metil ester asam lemak. Komposisi utama lempung ditemukan terdiri dari Si, Al dan Fe serta unsur-unsur minor lainnya seperti K, Ti, Na, Ca Mg, dan Mn (pengukuran XRF). Jenis mineral utama sampel lempung adalah kaolinite dan illite (karakterisasi XRD). Kalsinasi pada suhu 850 °C mengakibatkan penurunan fasa kaolinit yang menandakan telah terjadi transformasi parsial menjadi metakaolin (analisis XRD). Pengujian aktivitas katalitik di bawah kondisi reaksi tertentu dari semua lempung menunjukkan bahwa lempung yang dikalsinasi pada 850°C menghasilkan dua jenis senyawa biodiesel yaitu metil ester asam palmitat dan metil ester asam oleat (analisis GC-MS). Tanah liat yang dipanaskan pada suhu 110 dan 450 oC sama sekali tidak menunjukkan aktivitas katalitik
Co-Authors Fitria Ramadhani Florencia Tri Angellika Rycce Sylviana Pratikha Syukri Syukri Syukri Syukri Yetria Rilda