{'fraction_non_alphanumeric': 0.02501786990707648, 'fraction_numerical': 0.01501072194424589, 'mean_word_length': 5.11353711790393, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 1, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
Development of the supported nickel-baseed catalysts and application in pyrolyzing biomass

The supported nano-NiO/γ-Al2O3 catalyst was prepared by deposition-precipitation (DP) method. Different analytical approaches such as XRD, BET, TEM and SEM/EDX were used to characterize the synthesized catalysts. The results showed that the prepared nano-NiO/γ-Al2O3 catalysts had a coated structure with a loading of NiO in catalysts over 12 wt %, and they had also a high BET surface area of 124.6m2/g. The active components of catalyst were spherical NiO nanoparticles coated on the surface of supports with a size range of 12∼18 nm. Meantime, the activity of the catalysts to remove tar in the process of biomass pyrolysis was also investigated using a bench-scale combined fixed bed reactor. The experiments demonstrated that the tar yield after adding catalysts was reduced significantly, and the removal efficiency of tar reached to 99% for catalytic pyrolysis at 800oC, while the gas yield after adding catalysis increased markedly. Meanwhile, the compositions of gas products before and after adding catalysts in the process also changed significantly, especially the percentages of H2 and CO in the product gas after adding catalysts were obviously increased. Therefore, the prepared catalysts showed their excellent catalytic activity for tar removal and syn-gas producation in biomass pyrolysis.