Steam reforming of crude glycerol with in situ CO2 sorption

Abstract

Steam reforming of the crude glycerol by-product of a biodiesel production plant has been evaluated experimentally at atmospheric pressure, with and without in-situ CO 2 sorption, in a continuous flow fixed-bed reactor between 400 and 700 °C. The process outputs were compared to those using pure glycerol. Thermodynamic equilibrium calculations were used to assess the effect on the steam reforming process of the main crude impurities (methanol and four fatty acid methyl esters). The crude glycerol and steam conversions and the H 2 purity reached 100%, 11% and 68% respectively at 600 °C. No CH 4 was found at and above 600 °C. Steam reforming of crude glycerol with in-situ CO 2 removal is shown to be an effective means of achieving hydrogen purity above 88% in pre-CO 2 breakthrough conditions.

Dolomite study forin situCO2capture for chemical looping reforming

“…The Jander model is often referred to as being 3D because it is a combination of the parabolic law (1D) and the contracting volume equation for n = 3. The Jander (3D) diffusion mechanism is well established in describing the kinetics and reaction mechanisms in gas-solid systems, such as hydrogen adsorption, especially for storage materials (Cui et al 2008;Dou et al 2010). The conversion curves of thermal decompositions in both 'dry' and 'wet' macro-scale experiments were normalised between 0 and 1 as the minimum and maximum points during this reaction.…”

“…Calcium oxide (CaO) used for CO2 capture was first mentioned by DuMotay and Marechal in 1867, who enhanced the gasification of carbon by steam with lime (Barker 1973). The suitability of metal oxides (MexOy) in capturing CO2 at temperatures between 550 C and 750 C at atmospheric pressure (101.3 kPa) has been demonstrated in the past six decades (Dou et al 2010;Hyatt, Cutler, and Wadsworth 1958;Pimenidou et al 2010b;Squires 1967). The key reaction for the capture of CO2 by CaO is the following: CaO + CO2 CaCO3, which is considered in post-combustion or in situ capture of CO2 processes as well as in energy storage (Aihara et al 2001) with further encounter in flue gas CO2 separation (Han and Harrison 1994) and hydrocarbon and water gasification for H2 production (Gupta and Fan 2002).…”

“…This step regenerates the 'in situ' adsorptive material in chemical looping steam reforming like in the exothermic oxidation step of air feed over the reduced Ni-based catalysts (Dou et al 2010;Dupont et al 1997;Giannakeas et al 2012;Pimenidou et al 2010a). The reversibility of calcination has been confirmed by numerous investigators (Barker 1973;Chrissafis, Dagounaki, and Paraskevopoulos 2005b).…”

The selective oxidation of glycerol over model Au/TiO2 catalysts — The influence of glycerol purity on conversion and product selectivity

“…[1][2][3] Its valorisation through selective oxidation [5], etherification [6], dehydration [7] or reformation to H 2 [8] would impact on the economics of FAME production and further improve the atom efficiency (and carbon balance) of biodiesel production from vegetable or animal derived triglycerides.…”

Hydrogen from scrap tyre oil via steam reforming and chemical looping in a packed bed reactor

“…Several studies investigated the use of challenging liquid feedstock derived from biomass (vegetable oil, glycerol, pyrolysis bio-oils) [22][23][24][25][26] and from transport waste [27] to produce hydrogen.…”