Effective Catalytic of Rice Straw Pyrolysis over Ni/CaZnAl Catalyst for Producing Hydrogen-Rich Syngas

Ni-based catalysts are used in a wide range of biomass catalytic reactions. To further improve the catalytic performance and anti-deactivation ability of the catalyst, a Ni/CaZnAl catalyst was synthesized by using the sol–gel method. N 2 adsorption–desorption, X-ray fluorescence spectroscopy (XRF), temperature programmed reduction (TPR), X-ray diffraction (XRD), and X-ray photoelectron spectroscopy (XPS) were used to determine the activity of the catalyst. In addition, the impacts of various conditions on the catalytic performance were assessed in terms of gas composition and production and syngas generation (especially H 2 ). The experimental results show that 15% Ni/CaZnAl catalyst calcined at 500 ℃ and pyrolyzed at 800 ℃ for 20 min has the best effect on producing hydrogen-rich syngas. Compared with the catalyst calcined at 400 ℃, calcined at 500 ℃ has stronger stability and metal-support interaction, but its carbon resistance is slightly weaker. Under the optimum experimental conditions, the syngas output of 15% Ni/CaZnAl is 424.8 ml/g, which is 2.30 times higher than that of non-nickel (184.8 ml/g). After six times of use, the syngas output remains at 247.6 ml/g, which is more elevated than that without Ni by 33.98vol%.