Catalysis in Industry | 2019
Катализаторы Ni/MgO на структурированных металлических носителях для воздушной конверсии низших алканов в синтез-газ
Abstract
A series of thermostable heat-conducting selective catalysts for air conversion of lower alkanes to burn-initiating fuel additives fed as synthesis gas to fuel were developed based on nickel-containing highly porous foam-cellulous material (HPCM) and a net-shaped support. The catalyst synthesis included stages of preparation of the support based on Ni-HPCM (Ni 99,95 %, PPI = 40) or fechral grid, arrangement of the support surface and formation of structured units, thermal treatment of the samples, supporting of the active component via repeated impregnation with a combination of magnesium and nickel acetates, and stepwise thermal treatment. Thus prepared catalysts NiO-MgO/(HPCM or fechral) were tested in the reactions of air conversion of propane, propane-butane, natural gas, as well as tri-reforming. In all the 80–100 hour experiments, the catalysts provided 90–96 % conversion at the flow rate of 32000–71000 h –1 , no coke formation being observed at the air excess coefficient of 0.31–0.43. A two-phase two-temperature mathematical model of the air conversion of liquefied hydrocarbon gases (LHG) was developed for the numerical analysis of the results obtained; the modeled results agreed well with the experimental data on temperatures of the catalyst and flow, as well as on the composition of the outlet gas mixture. A generator of 100 kW heat power for the air conversion of LHG was calculated as a practical example.