Waste cooking oils (WCOs) are a cheap and rich source of carbon and hydrogen, and they exhibit great potential for the preparation of hydrogen gas and carbon nanomaterials. Here, we prepared three Pt–Ni/SBA-15 catalysts with Pt contents ranging from 0 to 2% to examine their activity in the catalytic cracking of WCO towards the production of hydrogen and carbon nanotubes (CNTs). A mixture of soybean oil, oleic acid and animal fat was used as a model compound of WCO, and the catalysts were characterised by inductively coupled plasma–optical emission spectrometry, scanning and transmission electron microscopy, X-ray diffraction, N₂ adsorption–desorption isotherms, temperature programmed reduction, thermogravimetric analysis and Raman spectroscopy. The effect of Pt loading and cracking temperature on the hydrogen production and the quality of CNTs was also evaluated. Among the prepared catalysts, 2%Pt–30%Ni/SBA-15 showed excellent catalytic activity at 750 °C, affording a maximum hydrogen content of 66.2 vol%, while CNTs with diameters of 20–100 nm and high crystallinity, oxidation stability, graphitisation and purity were also prepared.

废食用油（WCOs）是一种廉价而丰富的碳和氢来源，它们在制备氢气和碳纳米材料方面表现出巨大的潜力。在这里，我们制备了三种 Pt-Ni/SBA-15 催化剂，其 Pt 含量范围为 0% 到 2%，以检查它们在 WCO 催化裂化生产氢和碳纳米管 (CNT) 中的活性。以大豆油、油酸和动物脂肪的混合物作为 WCO 的模型化合物，并通过电感耦合等离子体发射光谱、扫描和透射电子显微镜、X 射线衍射、N ₂对催化剂进行表征。吸附-解吸等温线、程序升温还原、热重分析和拉曼光谱。还评估了铂负载和裂解温度对制氢和碳纳米管质量的影响。在制备的催化剂中，2%Pt–30%Ni/SBA-15 在 750 °C 表现出优异的催化活性，最大氢含量为 66.2 vol%，而直径为 20–100 nm 且结晶度、氧化稳定性高的 CNTs ，还制备了石墨化和纯度。