Fe Promoted Ni–Ce/Al2O3 in Auto-Thermal Reforming of Ethanol for Hydrogen Production

Abstract

Ni-Ce/Al 2 O 3 and Ni-Ce-Fe/Al 2 O 3 catalysts prepared by impregnation were tested in auto-thermal reforming (ATR) of ethanol. With ceria promotion, conversion of ethanol near 100% and selectivity to hydrogen at 103.6% can be achieved at 600°C in ATR of ethanol, while with both iron and ceria promotion, selectivity to hydrogen at 118.4% is observed, which are higher (57.17% improvement on hydrogen selectivity) than that of the conventional Ni catalyst. In addition, higher stability is also observed during a 31-h test. The improvements are attributed to the restrained acidity and high dispersion of nickel alumina spinel phase.

Methanol Steam Reforming over Indium-Promoted Pt/Al2O3Catalyst: Nature of the Active Surface

“…1566 eV assigned to tetrahedrally coordinated (T d ) Al sites on γ-Al 2 O 3 . 9,37,38 The Al K-edge peaks of the differently pretreated Pt/In 2 O 3 / Al 2 O 3 samples are identical, supporting the negligible influence of the sample preconditioning to its reaction state. However, when compared to the reference γ-Al 2 O 3 spectrum, the intensity ratio of the T d to O h related peaks is largely different.…”

“…The bottom plot shows the reference spectrum that features peaks around 1567.7 and 1571 eV, typical for distorted octahedral ( O h ) Al sites, and a shoulder at ca. 1566 eV assigned to tetrahedrally coordinated ( T d ) Al sites on γ-Al 2 O 3 . ,, …”

“…With steam, a secondary reaction of water-gas shift (WGS) converts some of the CO to CO 2 . Moreover, pure In 2 O 3 itself has been found to be more than 95% selective toward CO 2 in steam reforming of methanol (SRM) but 100 times less active as compared to the Pd/In 2 O 3 catalysts measured at 493 K. , γ-Al 2 O 3 is typically used to support steam reforming catalysts because of the high surface area and the favored metal–support interactions …”

“…Moreover, pure In 2 O 3 itself has been found to be more than 95% selective toward CO 2 in steam reforming of methanol (SRM) but 100 times less active as compared to the Pd/In 2 O 3 catalysts measured at 493 K. 7,8 γ-Al 2 O 3 is typically used to support steam reforming catalysts because of the high surface area and the favored metal−support interactions. 9 Pretreatment of the catalysts under reducing conditions is used to activate metal/oxide catalysts like Pd−ZnO or Pt− In 2 O 3 prior to steam reforming reaction. 10 It is believed that, upon reduction, the support is reduced forming a surface alloy with the metal (e.g., Pd−Zn or Pt−In).…”

Catalytic Steam Reforming of Ethanol to Produce Hydrogen: Modern and Efficient Catalyst Modification Strategies

“…As a result, the influence of promoters on the performance of Ni/CeMnO 2 was studied to improve conversion, H 2, and CO 2 selectivity. [64] Cu increased the catalyst's conversion rate to 70 %, while Fe came in second with a conversion rate of 61 %. Fe also had a better hydrogen production (60 %) and CO 2 selectivity (70 %) than the others, despite having the lowest selectivity for methane and ethanol conversion because of conducting the reaction to dehydrogenation route.…”