Yun Ha Kim

Selective CO removal in the H2-rich stream through a double-bed system composed of non-noble metal catalysts

Abstract The CO concentration in the effluent from the water-gas shift reactor can be reduced to be less than 15 ppm from about 1 vol through the double bed system composed of CuO-CeO2, which can oxidize CO selectively in the presence of excess H2, and Ni/Y-ZrO2, which is active for CO methanation in the presence of excess CO2, over a wide reaction temperature range.

OPTIMIZATION STRATEGY FOR A FISCHER-TROPSCH SYNTHESIS BENCH-SCALE REACTOR: EFFECT OF OBJECTIVE ELEMENTS ON OPTIMIZATION PERFORMANCE

A mathematical model of Fischer-Tropsch synthesis over an iron-based catalyst was developed for a bench-scale fixed-bed reactor. Parametric sensitivity analysis found that inert fraction, H2/CO ratio, and inlet and wall temperatures are effective manipulated variables. Three optimization strategies, with different combinations of objective functions and manipulated variables, were suggested to optimize conditions using the genetic algorithm, and it was shown by the comparison that maximization of CO conversion and C5+ productivity guaranteed both maximum production by amount of catalyst and sustainable operation by maintaining peak temperatures below an allowable limit, even without including maximum temperature as an objective function.

Synergy between microwave irradiation and promoter addition about synthesis of nanosized TPA-silicalite-1

Abstract Nanosized silicalite-1 has been synthesized in only 4 h by microwave synthesis with fumed silica precursor and promoter such as NaH 2 PO 4 . The influence of gel compositions, temperature, aging time and precursor addition on the synthesis of nanosized silicalite-1 were investigated. XRD and nitrogen adsorption showed no structural degradation and high surface area, ≈450 m 2 /g, for nanosized silicalite-1. The formation process of silicalite-1 crystals by using microwave through promoter addition is prior to crystallization rate of hydrothermal synthesis and without promoter. The mean particle sizes were ranged from 150 to 250 nm.