In this study, a Ni-based sludge coke catalyst was prepared by mechanical ball-milling and mild injection to produce high-quality hydrogen-rich gas through the gasification of sludge. The effects of different factors, such as ball milling time, gasification temperature, NiO loading rate and steam flow rate on the gasification characteristics of the Ni-based sludge coke were investigated. The results showed that the optimum process conditions were the ball-milling time of 10 min, gasification temperature of 900 °C, NiO loading rate of 20% and steam flow rate of 1 g min⁻¹. Under these conditions, the gas production efficiency was improved, with gas and H₂ production rates of 0.76 m³ kg⁻¹ and 0.34 m³ kg⁻¹, respectively. Temperature is a key factor of gasification. The gas yield and H₂ yield at 900 °C were 38 times and 85 times higher than those at 500 °C, respectively. The FTIR and XRD analysis further revealed that the selection of an appropriate ball-milling time caused the NiO to be evenly distributed on the biochar, thereby improving its catalytic performance. While, increasing the temperature promoted the full pyrolysis of organic matter and the secondary decomposition of tar, which improved the gasification efficiency. The results obtained here allow optimization of the technical parameters for the generation of hydrogen-rich gas by sludge gasification, thereby providing a theoretical basis for the production of high-quality gas through the catalytic gasification of Ni-based biochar.

本研究通过机械球磨和温和喷射制备镍基污泥焦化催化剂，通过污泥气化生产优质富氢气体。考察了球磨时间、气化温度、NiO负载率和蒸汽流量等因素对Ni基污泥焦气化特性的影响。结果表明，最佳工艺条件为球磨时间为10 min，气化温度为900 °C，NiO负载率为20%，蒸汽流量为1 g min ^-1。在这些条件下，产气效率得到提高，产气率和 H ₂产率分别为 0.76 m ³  kg ^-1和 0.34 m ³  kg^-1，分别。温度是气化的关键因素。900℃下的气体产率和H ₂产率分别是500℃时的38倍和85倍。FTIR 和 XRD 分析进一步表明，选择合适的球磨时间可使 NiO 均匀分布在生物炭上，从而提高其催化性能。而升高温度促进了有机物的充分热解和焦油的二次分解，从而提高了气化效率。研究结果优化了污泥气化富氢气体的技术参数，为镍基生物炭催化气化生产优质气体提供了理论依据。