Catalytic co‐pyrolysis of packaging plastic and wood waste to achieve H ₂ rich syngas

Abstract

In this work, the co-pyrolysis of pine sawdust and low-density polyethylene (LDPE) was performed in a two-stage fixed-bed reactor to achieve hydrogenrich syngas and to investigate the effect of the parameters on gas yield and composition. Gas chromatography was used to confirm the content of the gas products. The pyrolysis was supported with Ni (in 5-25 wt%) loaded on activated carbon (AC). The maximum hydrogen concentration was 392.8 mmol g −1 sample, which was achieved by the use of the 10% Ni-AC catalyst. The influence of Ni loading on supporter was investigated by scanning electron microscope and transmission electron microscope techniques besides the thermogravity analysis. The increasing size of the Ni particles can be observed as a function of the Ni concentration on the catalyst. Carbon deposition was detected and the amorphous carbon seems more dominant than filamentous form. In addition, the effect of fluid residence time (water inlet and purge gas) on syngas yield was studied. Three different fluid residence times were investigated, and among them, the highest hydrogen yield was 392.8 mmol g −1 sample at 1.57 minutes residence time. Furthermore, the catalyst lifetime was studied using 10 wt% of Ni containing AC, and the average hydrogen concentration was 196.0 mmol g −1 sample over 15 cycles.

Waste plastic to energy storage materials: a state-of-the-art review

“…The main methods of converting waste plastics into syngas today are catalytic pyrolysis and co-pyrolysis. Bobek-Nagy et al 149 This method was able to achieve a higher carbon conversion (81%) and syngas concentration (92.8%) compared to the mixed-feed process. The H 2 yield was as high as 85.8 mm g −1 HDPE at a H 2 /CO ratio of 2.0.…”

“…The main methods of converting waste plastics into syngas today are catalytic pyrolysis and co-pyrolysis. Bobek-Nagy et al 149 obtained H 2 -rich syngas by co-pyrolysis of pine sawdust and LDPE. The effects of water and nickel content on the H 2 yield were investigated and the results showed that the highest H 2 yield (456.8 mmol g plastic −1 ) was obtained at a water sample ratio of 15.00 for the same nickel content.…”

Fe-POM/attapulgite composite materials: Efficient catalysts for plastic pyrolysis

“…It produces 3 liquid products that mainly contain heavier hydrocarbons (C 6 -C 25 ) (Lin, Yang et al 2004, Akpanudoh, Gobin et al 2005. The use of catalyst not only decreases the degradation temperature but also maximizes the yield of lower hydrocarbons (Bobek-Nagy, Gao et al 2020, Chai, Wang et al 2020, Shah, Attique et al 2021. Various catalysts including, silica, alumina, zeolites, mesoporous materials, and heteropolyacids have been tested for polymer degradation to get valuable hydrocarbons (Serrano, Aguado et al 2000, Mastral, Berrueco et al 2006, Aguado, Serrano et al 2007, Shah, Attique et al 2021, Wang, Jiang et al 2021.…”

CeO2 and La2O3 Promoters in the Steam Reforming of Polyolefinic Waste Plastic Pyrolysis Volatiles on Ni-Based Catalysts

“…Moreover, steam gasification of waste plastics has been proposed for the production of hydrogen rich gas [8][9][10][11][12] . More recently, pyrolysis-reforming has also been demonstrated to be especially suitable for the selective production of hydrogen from waste plastics [13][14][15][16][17][18][19][20][21][22] .…”