Article Per Year (5 Year)
p-Index From 2021 - 2026
0.408
P-Index
This Author published in this journals
All Journal Indonesian Journal of Material Research
Risfidian Mohadi
Master Program of Materials Science, Graduate School, Universitas Sriwijaya, Palembang, 30139, Indonesia
Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Electrical & Electronics Engineering Energy Engineering

Published : 2 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 2 Documents
Search

 1 
Evaluation of Natural Zeolite and Bentonite as Catalysts in Cyclohexanone Oxidation with Hydrogen Peroxide Muhammad Hidayatullah; Sahrul Wibiyan; Risfidian Mohadi; Aldes Lesbani
Indonesian Journal of Material Research Vol. 3 No. 3 (2025): November
Publisher : Magister Program of Material Science Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijmr.20253369

Abstract

The catalytic oxidation of cyclohexanone using environmentally benign oxidants remains a key challenge in sustainable organic synthesis. In this study, natural zeolite (clinoptilolite and mordenite) and bentonite were evaluated as heterogeneous catalysts for the oxidation of cyclohexanone with hydrogen peroxide under reflux at 90 °C. Structural characterization by X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FTIR) confirmed the aluminosilicate frameworks, where clinoptilolite exhibited the highest crystallinity, followed by bentonite and mordenite. The oxidation products were analyzed using FTIR, melting point measurements, and gas chromatography–mass spectrometry (GC–MS). Despite the catalytic activity of all materials, FTIR and melting point analyses revealed that the expected adipic acid was not formed under the applied conditions. GC–MS results indicated the formation of partially oxidized oxygenated intermediates such as alcohols, ethers, and carbonyl derivatives, whose distribution strongly depended on the catalyst’s pore structure and surface properties. Clinoptilolite promoted confined partial oxidation due to its microporous structure, whereas bentonite facilitated non-selective oxidation owing to its open layered framework. These findings emphasize that the interplay between molecular confinement and oxygen accessibility governs the selectivity of cyclohexanone oxidation and provides insights for the rational design of improved zeolite- and clay-based catalytic systems for green oxidation reactions.
Synthesis of Adipic Acid via Eco-Friendly Oxidation of Cyclohexanone–Cyclohexanol Mixture over B₂O₃–SiO₂ Catalyst Jonra P. Sitanggang; Alfan Wijaya; Risfidian Mohadi; Aldes Lesbani
Indonesian Journal of Material Research Vol. 3 No. 3 (2025): November
Publisher : Magister Program of Material Science Graduate School of Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/ijmr.20253370

Abstract

The synthesis of adipic acid through the oxidation of a cyclohexanone–cyclohexanol mixture was investigated using 30% hydrogen peroxide (H₂O₂) as the oxidizing agent and a B₂O₃–SiO₂ catalyst synthesized via heat treatment at various temperatures. This study aimed to evaluate the catalytic performance of B₂O₃–SiO₂ in facilitating the oxidation reaction and to determine the optimum reaction conditions for achieving the maximum yield of adipic acid. The effects of reaction time and temperature on the oxidation process were systematically studied. The reactions were conducted for 5, 6, 7, and 8 hours at temperatures of 60°C, 70°C, 80°C, and 90°C. The reaction products were analyzed using Gas Chromatography (GC) and Fourier Transform Infrared Spectroscopy (FT-IR). The results showed that the B₂O₃–SiO₂ catalyst exhibited the highest catalytic activity at 90°C, producing adipic acid with a maximum yield of 2.36% after 7 hours of reaction. Based on FT-IR characterization, it was observed that the B₂O₃–SiO₂ catalyst became unstable after the reaction, as indicated by the reduction of Brønsted acid sites. This decrease in acidity led to a less effective catalytic performance, resulting in a suboptimal oxidation process and a relatively low yield of adipic acid.
Co-Authors Aldes Lesbani Alfan Wijaya Jonra P. Sitanggang Muhammad Hidayatullah Sahrul Wibiyan