CuO-MnO2-NiO/Ce(1-X)Zr(X)O2 CATALYSTS SYNTHESIZED FOR BENZENE OXIDATION IN FIXED BED REACTOR

• Main Author: Clarissa Sophiana, Intan
• Format: Theses
• Language: Indonesia
• Subjects: Teknik (Rekayasa, enjinering dan kegiatan berkaitan)
• Online Access: https://digilib.itb.ac.id/gdl/view/45087
• Institution: Institut Teknologi Bandung

Benzene is one of the volatile organic compound (VOC) which is toxic and carcinogenic, generally produced from industrial and vehicle emissions. Catalytic oxidation is the best method of process VOCs in performance, working range, flexibility and operating costs aspects. The most commonly used catalyst today is metal oxide based because it is cheaper, easy to obtain, not poisoned, long lifetime, and has capability of regeneration. Commonly used oxide metals for VOC catalytic oxidation are ceria and zirconia because they have high oxygen storage capacity and good thermal stability, so it used for catalyst support and promotor. The active phase of catalyst is kind of metal oxides such as copper oxide, manganese oxide, and nickel oxide. Therefore, this study was conducted to synthesize metal oxide catalysts in various variations, to characterize their phsyco-chemical properties, and to test their activity. The catalysts is synthesized through two stages. First, synthesize support as well as promotor of Ce(1-x)Zr(x)O2. Last, impregnation active side of CuO, MnO2, and NiO to Ce(1-x)Zr(x)O2. The Ce(1-x)Zr(x)O2 is made by coprecipitation method using ammonia solution as precipitating agent. The impregnation of CuO, MnO2, and NiO is carried out by using a solution nitrate hydrate : copper, manganese, and nickel. The impregnated catalyst is then dried and calcined. The composition of the molar ratio of Ce(1-x)Zr(x)O2 and percent weight of CuO, MnO2, and NiO are made as variations. Characterization of the catalyst using H2-TPR, XRD, and BET methods to find interaction between metals, crystallinity of the catalyst, surface area and pore volume of the catalyst, and morphology or surface structure of the catalyst. Catalyst activity and stability test is performed by feeding a mixture of 2,000-3,000 ppm benzene and air into a glass reactor (ID = 1 cm) containing 50 mg of catalysts which mixed with glass beads and has high gas hourly space velocity of 288,000 mL g-1 h-1. The 3,3% CuO–3,3% MnO2–3.3% NiO/Ce0,75Zr0,25O2 showed higher catalytic activity for catalytic benzene oxidation (T90% = 250°C), which presents a good candidate for industrial catalysts for the removal of benzene in low concentrations at low temperature.