Study of Ni/SiO2 Catalysts Activities in Glucose Hydrogenation Reaction at Low Pressure

• Main Author: (NIM. 10504032), ELVIERA
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/12055
• Institution: Institut Teknologi Bandung

Commercially, sorbitol was produced by glucose hydrogenation reaction over Ni catalyst (50-70 % w/w Ni) in discontinuous and continuous reactor under high temperatures and pressures (T = 350-419 K, P = 4-12 MPa). This caused high cost production and Ni leaching in product. This research investigates the effects of precursor compounds towards catalyst size particles, Ni leaching, and Ni/SiO2 catalyst activities in glucose hydrogenation reaction. Synthesis Ni catalysts with various Ni contents (5 and 10% w/w Ni) use impregnation methods of different precursors ([Ni(en)3](NO3)2.2H2O and Ni(NO3)2.6H2O) into SiO2 support. Before reduction and catalyst activation with H2, Ni/SiO2 catalyst was calcined. Catalytic activities proceed in modify glass reactor under low pressure and temperature (T = 353 K, P = 0,1 kPa). XRD and AAS analysis shown size particles Ni/SiO2 catalyst with [Ni(en)3](NO3)2.2H2O precursor (daverage = 25,6 nm, % Ni = 3.5-10 %) is smaller than with Ni(NO3)2.6H2O precursor (daverage= 38,6 nm, % Ni = 6-12 %) respectively. Determination of catalytic activity shown the glucose conversion using Ni/SiO2 catalyst from [Ni(en)3](NO3)2.2H2O precursor (12.29-33.76%) was bigger than Ni(NO3)2.6H2O precursor (1.48-22.07%). SEM/EDX characterization shown that the particles distribution of inactive NiO/SiO2 catalyst with [Ni(en)3](NO3)2.2H2O precursor was more homogenous than with Ni(NO3)2.6H2O precursor . It was found that C and N compounds still remained in catalyst which caused catalyst deactivation. <br />