Hydrogen-Rich Gas Production from Biomass Catalytic Gasification

Abstract

With the use of dolomite in the fluidized-bed gasifier and the use of nickel-based catalysts in the fixed bed reactor downstream from the gasifier, the characteristics of hydrogen yield from biomass are investigated in the present study. Some calcined dolomite is placed initially in the gasifier with an amount of 120 g/(kg h -1 ) biomass. To replace the eroded and elutriated dolomite, calcined dolomite (0.3-0.45 mm) is continuously fed and its feeding rate is determined by preliminary test. The influence of the operating conditions in the catalytic reactor on the production of gases, especially H 2 , is studied over the temperature range of 650-850 °C, for weight hourly space velocity (WHSV) in the range of 2.68-10.72 h -1 . In the gaseous product, the average content of H 2 exceeds 50 vol %; C 2 content is lowered to below 1 vol %, and nearly half of CH 4 is converted after the catalytic reactor. Over the ranges of experimental conditions examined, the highest gas yield reaches 3.31 Nm 3 /kg biomass, wet basis; the maximum hydrogen yield reaches 130.28 g H 2 /kg biomass, wet basis. This system shows a good performance over a lifetime test of 350 min.

Promoting hydrogen production and minimizing catalyst deactivation from the pyrolysis-catalytic steam reforming of biomass on nanosized NiZnAlOx catalysts

“…The gas composition performance of biomass catalytic steam gasification has also been studied by other researchers [1,31,40,66]. Among the aforementioned reports for investigating the influence of Ni loading on gas concentrations during steam reforming of hydrocarbons, it was found that H2 was increased and concentrations of CH4 and C2-C4 were reduced.…”

“…Therefore, there is global interest in the development of renewable and clean fuels as alternatives to fossil fuels [1][2][3][4].…”

“…For enhanced catalytic performance and thermal stability, various supports (such as, zeolites [4,5,7,28,29], dolomite [1,22,30,31], olivine [21,32], other metal and metal oxides such as La, Fe, CeO2, SiO2, ZrO2, TiO2, MgO, ZnO, Al2O3 [10,[33][34][35][36][37][38][39]) have been applied to change the interactions between support and metal particles which may thereby influence the catalytic properties. Particularly, alumina has been widely investigated as a catalyst support due to high activity and low cost in the reforming process [33][34][35]40].…”

“…Biomass gasification has been investigated with single [21] or two-stage reaction systems [1,4,5,7,51]. Under the single stage reaction system, the samples and catalysts were mixed and the pyrolysis and gasification processes were operated under the same conditions, resulting in difficulty in the separation of catalysts and biomass residues after reaction [21].…”

An Alternative for the End-of-life Phase of Flame Retardant Textile Products: Degradation of Flame Retardant and Preliminary Settings of Energy Valorization by Gasification

“…However, the fed particles size also plays an important role in the gasification outcomes, having larger surface areas per unit mass and larger pore sizes facilitate rapid heat transfer and gasification (Kirubakaran et al 2009). In addition, smaller feed size resulted in more CH4, CO, and C2H4 and less CO2, leading to higher gas yields and gas energy content (Lv et al 2004).…”