Syngas from CO2 reforming of coke oven gas: Synergetic effect of activated carbon/Ni–γAl2O3 catalyst

Abstract

The CO 2 reforming of coke oven gas for the production of synthesis gas has been studied over an activated carbon, an in-lab prepared Ni/Al 2 O 3 catalyst and physical mixtures of both materials in different proportions (AC+Ni) at 800 ºC. It was found that there are two possible coexisting reaction pathways: the direct dry reforming of methane (decomposition of methane followed by gasification of the carbon deposits) and the reverse water gas shift reaction followed by the steam reforming of methane. If the process is carried out with the physical mixtures AC+Ni, there is a synergetic effect between both materials. The experimental conversions are higher than the conversions predicted by the law of mixtures, whereas the production of water is lower, resulting in a higher selectivity. The mixtures also showed a lower loss of porosity than when the activated carbon and the in-lab prepared Ni/Al 2 O 3 were used individually. Therefore, the combination of these materials may produce catalysts that are more resistant to deactivation. The synthesis gas obtained was analyzed and it was found suitable for the production of methanol.

Catalytic reforming of pyrolysis tar over metallic nickel nanoparticles embedded in pyrochar

“…In addition, other formed larger clusters (Fig. 8B) was most likely attributed to the soot formation and carbon deposit resulting from hydrocarbons cracking [40,41].…”

New process for producing methanol from coke oven gas by means of CO2 reforming. Comparison with conventional process

“…These processes are steam reforming, autothermal reforming, and combined reforming. However, in the last few years an alternative source of syngas production has emerged: coke oven gas [14][15][16][17][18][19][20][21][22][23]. COG is a by-product from coking plants, consisting mainly of H 2 (55-60 %), CH 4 (23-27 %), CO (5-8 %) and N 2 (3-5 %) along with other hydrocarbons, H 2 S and NH 3 in small proportions.…”

“…This is due to the high H 2 /CO ratios and R parameters (Eq. 1) resulting from these processes if the coke oven gas is used as source of methanol production [15,18,20,21,23]. R, dimensionless = (H 2 -CO 2 ) / (CO + CO 2 ) (Eq.…”

“…Only minor adjustments of these values would then be required, and this can be done using the H 2 recovered at the end of the process of methanol production [18]. Moreover, the production of methanol from coke oven gas via CO 2 reforming could be considered as a "partial recycling" of carbon dioxide, since half of the carbon dioxide produced, when methanol is used, is consumed during the production process itself [15,18,20,21,23]. This balance is illustrated in Figure 1.…”

Effects of Nickel Precursor and Calcination Temperature on the Performance of Ni/MgAl2O4 Catalysts for Syngas Production by CO2 Reforming of Coke Oven Gas

“…In recent years, the CO 2 reforming of COG or dry reforming to syngas (H 2 and CO) has caused a hot research. Syngas could be further converted into liquid fuels and COG dry reforming reaction can not only achieve environmental protection, but also convert the two greenhouse gases into two energy gases to make the energy utilization [1][2][3].The catalysts used for COG dry reforming consist of support, promoter and active metal. The non-noble metals in Group VIII of Ni based catalysts have been researched widely because of low cost and relatively high activity in COG dry reforming.…”