Catalytic Purification of Raw Gas from Biomass Gasification on Mo–Ni–Co/Cordierite Monolithic Catalyst

Abstract

This study presents the preparation of a 1Mo3Ni1Co/Cor catalyst by vacuum impregnation to obtain a clean biomass gasification product gas. The effects of the air equivalence ratio (ER) and catalytic temperature on tar cracking and gas reforming were investigated. The regeneration activity of the 1Mo3Ni1Co/Cor catalyst was also evaluated in biomass gasification. Results show that the choice of ER is highly important, and an increase in catalytic temperature is favorable for cleaning biomass gasification raw gas. When the ER and catalytic temperatures were 0.21 and 800 °C, the gas yield, tar conversion, and hydrogen yield reached 1.28 N m3/kg, 99.2%, and 49.3 g/kg, respectively. The regeneration activity of this catalyst is relatively stable and close to that of the fresh catalyst after a 4 h reaction; however, this activity is relatively lower than that of the fresh catalyst in the initial stage. This difference is caused by the formation of Mo2C in gas reforming. Finally, the activation energy and the pre-exponential factor of the catalyst calculated by first-order reaction kinetics model are 33.79 kJ/mol and 523 s–1, respectively.

Citric acid-assisted synthesis of γ-alumina-supported high loading CoMo sulfide catalysts for the hydrodesulfurization (HDS) and hydrodenitrogenation (HDN) reactions

“…It is envisaged that part of the water produced by either the reduction of Co cation and Mo citrate in the LT reduction step or even the dehydroxylation of alumina could participate in this reaction, which could be catalyzed by partially reduced CoMo (or even CoMoOC x ) species [10,30]. It should be mentioned that a strong peak at 525°C from apparently H 2 (and CO) production was observed in the TCD response (result not shown); however, H 2 was not clearly discernible in the MS response, likely due to the rapid H 2 consumption by the subsequent reduction reactions.…”

Syngas Production from Steam Gasification of Palm Kernel Shell with Subsequent CO2 Capture Using CaO Sorbent: An Aspen Plus Modeling

“…In comparison to the biochemical conversion of biomass, the thermochemical gasification process is more propitious for fuel production like syngas and methane. These fuels can be used as substitutes for petroleum products without any major modification in existing infrastructure and machinery. , …”

Tar Reforming in Model Gasifier Effluents: Transition Metal/Rare Earth Oxide Catalysts

“…25,28,58,59 The complexity of biogasifier syngas dictates that many simultaneous reactions will take place during tar reforming. Detailed comparisons on inlet/outlet compositions suggest that these include, in addition to the major reforming and water− gas shift reactions, CO 2 reforming, 26,60 methane reforming and CO hydrogenation to methane, 12,13,15,18,55,57,61 and tar hydrocracking. 6,18,60,61 While methane reforming often follows the same trends as tar reforming and has little apparent effect on it, 13,18,57 in contrast the active oxygen generated by the reduction of CO 2 can enhance tar decomposition, 16,29,60 as does residual O 2 from the gasifier.…”