Methanol steam reforming reaction

The catalytic combustor provides heat for the endothermic reforming reaction and the vaporization of liquid fuel. The endothermic reforming reaction is carried out in a parallel flow-type micro-channel of the reformer unit. It is well known that the methanol steam reforming reaction for hydrogen production over the Cu/ZnO/AbOs catalyst involves the following reactions [10]. Eq. (1) is the algebraic summation of Eqs. (2) and (3). 

Jacobs, G., Patterson, P.M., Graham, U.M., Crawford, A.C., Dozier, A., and Davis, B.H. 2005. Catalytic links among the water-gas shift, water-assisted formic acid decomposition, and methanol steam reforming reactions over Pt-promoted thoria. J. Catal. 235 79. 

Figure 3 in Ref. 217, reproduced on the right, shows SIMS spectra from a CuO/Ce02/ y-Al2 03 catalyst before and after a methanol steam reforming reaction. Assign the main peaks in the spectra, and provide an interpretation for the changes seen in the catalyst after reaction. 

DME hydration occurs over acid catalysts, whereas the methanol steam reforming reaction proceeds over metal catalysts. Consequently, DME steam reforming requires a multi-component catalyst. Two approaches have been proposed in the literature (a) physical mixtures of a DME hydrolysis catalyst and a methanol steam reforming catalyst (b) supported catalysts that combine the DME hydrolysis and methanol steam reforming components into a single catalyst. 

The concept of the system was to vaporize/preheat a methanol/air mixture, combust it in a separate combustor and feed the methanol steam reforming reaction with the energy of the hot combustion gases (see Figure 2.75). light-off of the combustion gases occurred at 70 °C [115]. The combustion gases were further used subsequently to supply the fuel pre-heater/evaporator of the combustor and finally the fuel pre-heater/evaporator of the reformer. Unconverted methanol and water were removed in a separator from the reformate prior to GC analysis. 

A. lulianelli, T. Longo and A. Basile, Methanol steam reforming reaction in a Pd-Ag membrane reactor for CO-free hydrogen production, bit. J. Hydrogen Energy, 2008, 33, 5583-5588. 

Figure 6.4 Numbers of publications of Methanol steam reforming reaction (MSR) in membrane reactors (MRs) throughout the years.

Database, www.scopus.com, searching keywords methanol steam reforming reaction and membrane reactor . 

Wang C, Boucher M, Yang M et al (2014) ZnO-modified zirconia as gold catalyst support for the low-temperature methanol steam reforming reaction. Appl Catal B 154-155 142-152... 

Endothermic and exothermic reactions can be successfully combined in microreactors because of the fast heat removal that reduces the required heat for the endothermic reaction. Tadbir and Akbari [63] numerically simulated methanol steam reforming in combination with methanol oxidation reaction in the neighboring chaimels of the microreactor. The authors used the mechanism of Peppley et al. [64] for the methanol steam reforming reactions, while the reaction rate for the methanol oxidation reaction was adopted from Ref [65], Thus, the following reactions were considered to be main reactions ... 

The catalyst-coated microchannel reactor and the plate-type reactor seem to be more attractive than the micropacked bed reactor due to low pressure drop and less channeling of gas, although it possess low catalyst loading that may affect the performance and durability of the system. The methanol steam-reforming reactions... 

The methanol steam reforming reaction is viewed as a very interesting and promising method for hydrogen production, useful for fuel cell applications (AgreU et al, 2002 Han et aL, 2000 Sekizawa et al, 1998 Takahashi et al, 2001). In accordance with the specialized literature, the main chemical reactions taken into consideration are the following ... 

Percentage distribution of the catalysts used for carrying out the methanol steam reforming reaction. 

Methanol steam reforming reaction conversion versus reaction temperature. 

---