Herma Dina Setiabudi

Hydrogen-Rich Syngas Production via Ethanol Dry Reforming over Rare-Earth Metal-Promoted Co-based Catalysts

This chapter is the synopsis of the recent investigation on hydrogen-rich syngas generation using ethanol dry reforming approach over rare-earth metal-supported cobalt catalysts. Ce- and La-promoted and unpromoted 10%Co/Al2O3 catalysts were synthesized by co-impregnation technique and were characterized using a wide range of methods, namely, Brunauer-Emmett-Teller (BET) surface area, X-ray diffraction (XRD) measurement, temperature-programmed oxidation (TPO), H2 temperature-programmed reduction (H2-TPR), NH3 temperature-programmed desorption (NH3-TPD) and Raman spectroscopy measurements. The influence of operating conditions including varying CO2:C2H5OH ratios from 2.5:1 to 1:2.5 and reaction temperature range of 923–973 K was also investigated in this chapter. The addition of both CeO2 and La2O3 promoters facilitated the H2 reduction, enhanced the basic property of catalysts and improved active metal dispersion. Regardless of reaction temperature and reactant composition, La-promoted catalyst exhibited the highest C2H5OH and CO2 conversions followed by Ce-promoted and unpromoted catalysts. The increment of CO2 partial pressure from 20 to 50 kPa enhanced C2H5OH and CO2 conversions by up to 20.0% and 27.4%, respectively. However, reactant conversions significantly declined with growing C2H5OH partial pressure from 20 to 50 kPa. La and Ce addition hindered carbon deposition on catalyst surface during ethanol dry reforming reaction, and the amount of carbon deposition declined from 51.49% to 30.06% with the addition of La.

Syngas Production from CO2 Reforming and CO2-steam Reforming of Methane over Ni/Ce-SBA-15 Catalyst

This study compares the catalytic performance of mesoporous 10 Ni/Ce-SBA-15 catalyst for CO2 reforming and CO2-steam reforming of methane reactions in syngas production. The catalytic performance of 10 Ni/Ce-SBA-15 catalyst for CO2 reforming and CO2-steam reforming of methane was evaluated in a temperature-controlled tubular fixed-bed reactor at stoichiometric feed composition, 1023 K and atmospheric pressure for 12 h on-stream with gas hourly space velocity (GHSV) of 36 L gcat -1 h-1. The 10 Ni/Ce-SBA-15 catalyst possessed a high specific BET surface area and average pore volume of 595.04 m2 g-1. The XRD measurement revealed the presence of NiO phase with crystallite dimension of about 13.60 nm whilst H2-TPR result indicates that NiO phase was completely reduced to metallic Ni0 phase at temperature beyond 800 K and the reduction temperature relied on different degrees of metal-support interaction associated with the location and size of NiO particles. The catalytic reactivity was significantly enhanced with increasing H2O/CO2 feed ratio. Interestingly, the H2/CO ratio for CO2-steam reforming of methane varied between 1 and 3 indicated the occurrence of parallel reactions, i.e., CH4 steam reforming giving a H2/CO of 3 whilst reverse water-gas shift (RWGS) reaction consuming H2 to produce CO gaseous product.