Catalytic activity of atomized Ni3Al powder for hydrogen generation by methane steam reforming

Abstract

The catalytic activity of Ni 3 Al for methane steam reforming was investigated for the first time using its atomized powder. It was found that the activity was significantly enhanced by the combined pretreatment of acid and alkali leaching, while it was quite low for the as-received powder. The high activity was attributed to the formation of fine Ni particles on the porous surface of the powder.

Catalytic Activity of Oxidation-Reduction Pre-Treated Ni₃Al for Methane Steam Reforming

“…The H 2 production rate of the pre-treated powder was above 90 ml min -1 g-cat -1 at 873 K, and showed no significant changes with the increase of reaction temperature. In contrast, the H 2 production rate of the as-received powder was nearly zero below 1123 K, and then increased markedly above 1123 K, which was consistent with our previous report [12]. These results show clearly that the oxidation-reduction pre-treatment significantly reduces the onset temperature of the catalytic 646 THERMEC 2009 Supplement activity to less than 873 K, i.e., the activity at lower temperatures is increased by the oxidation-reduction pre-treatment.…”

“…The isothermal test, were carried out. The details of the reaction tests were described in the previous reports [11,12]. The surface morphology and composition of the powder were analyzed by scanning electron microscopy (SEM, JEOL, JSM-7000F) coupled with an X-ray energy dispersive spectroscopy (EDS) system.…”

“…Recently, we found that Ni 3 Al, in the form of both powder and foil, shows high catalytic activity and selectivity for methanol decomposition [9][10][11] and methane steam reforming [12][13][14], indicating a possibility to develop Ni 3 Al as catalysts for hydrogen production. It was found that the catalytic properties of Ni 3 Al can be significantly improved by surface treatments, such as alkali and/or acid leaching [5,12,13].…”

“…It was found that the catalytic properties of Ni 3 Al can be significantly improved by surface treatments, such as alkali and/or acid leaching [5,12,13]. The enhancement was attributed to the formation of fine Ni particles on the surface of Ni 3 Al.…”

Recrystallization Textures in Heavily Cold-Rolled Ni₃Al Based Single Crystals

“…We've recently developed their foils by cold rolling [2][3][4][5][6], which became possible using single crystalline ingots as a starting material [7]. Furthermore, we've found that they exhibit a catalytic activity for hydrogen production reactions such as methanol decomposition [8][9][10][11][12] and methane steam reforming [13,14]. Thus, the Ni 3 Al based foils can be used as a container and a catalyst in the micro chemical reactor for hydrogen production consequently.…”