Destruction of gasification tar over Ni catalysts in a modified rotating gliding arc plasma reactor: Effect of catalyst position and nickel loading

Plasma-Catalytic Reforming of Naphthalene and Toluene as Biomass Tar over Honeycomb Catalysts in a Gliding Arc Reactor

“…Loading Ni to the γ-Al 2 O 3 coated blank substrate slightly reduced the specific surface area but further promoted the energy efficiency and tar conversion, which indicates the core catalytic role of Ni species in the steam reforming reaction. This has been demonstrated in previous studies. , …”

“…Coating γ-Al 2 O 3 on the substrate significantly increased the S BET and pore size as γ-Al 2 O 3 is well known for its high porosity . After further loading the active metal Ni, the S BET , average pore diameter, and pore volume slightly dropped, which suggests that the support surface was covered and/or its pores were partially blocked by the active metal . After the plasma steam reforming reaction, the S BET and pore size of the blank material and γ-Al 2 O 3 were decreased, especially for the blank material, which can be due to the formation of carbon deposition.…”

“… 38 Xu and co-workers found that packing a Ni/γ-Al 2 O 3 catalyst bed 62 mm downstream of an anode in a rotating GAD reactor resulted in a toluene conversion of 91.9%, which was 21% higher than that obtained without using any catalyst. 39 These previous studies demonstrated the effectiveness and benefits of incorporating catalysts into GAD for biomass gasification tar conversion. However, the catalysts were mainly placed in the GAD reactor in the form of a packed-bed, which would cause high pressure drop and therefore enhance the power for fluid flow, 40 especially for the conditions of high gas flow rate like that required in GAD.…”

“…This has been demonstrated in previous studies. 27,39 The purely thermal-catalytic experiment was performed when the honeycomb materials were heated at 350 °C in the same GAD reactor without discharge to evaluate the function of plasma in the tar reforming reaction (Figure 6a). Clearly, almost no tar compounds were converted in the thermalcatalytic reactions regardless of the honeycomb material type.…”

“…Compared to DBD, gliding arc discharge (GAD) is featured by simple configuration, high processing capacity, and relative higher energy density, which enable it to show more potential for efficient destruction and reforming of tar. − Moreover, the enhanced reaction performance could be achieved by introducing suitable catalysts into the GAD reactor, which has been confirmed in CO 2 conversion and CH 4 activation using GAD. − For the biomass gasification tar, we previously performed the conversion of naphthalene and toluene mixture (model tar compound) in GAD coupled with a Ni-Co/γ-Al 2 O 3 bimetallic catalyst to obtain the highest total tar conversion (95.1%) and overall energy efficiency (40.3 g/kWh) . Xu and co-workers found that packing a Ni/γ-Al 2 O 3 catalyst bed 62 mm downstream of an anode in a rotating GAD reactor resulted in a toluene conversion of 91.9%, which was 21% higher than that obtained without using any catalyst . These previous studies demonstrated the effectiveness and benefits of incorporating catalysts into GAD for biomass gasification tar conversion.…”