Abstract The objective of this work was to determine the impact of hydrogen-activating metals on catalytic fast pyrolysis over ZSM-5 with and without hydrogen addition. Ga-, Ni-, Cu-, Co-, and Pt-modified ZSM-5 catalysts with metal-to-aluminum molar ratios of 2 were prepared by incipient wetness method. The catalysts were evaluated for hydrocarbon and oxygenate yields and for deactivation by analytical pyrolysis (Py-GC–MS), and post-reaction catalysts for characterization were prepared in a larger fixed-bed reactor. In inert atmosphere, there was a linear correlation between both the hydrocarbon yield and coke formation and density of strong acid sites, and the main impact of the metals was occlusion of active sites in ZSM-5, leading to proportional reductions in hydrocarbon and coke yields. With the addition of hydrogen, several metals (Pt, Ni, Cu, Co) activated hydrogen and further reduced coke formation, leading to improvements in the ratio of hydrocarbons to coke. No metal-modified catalyst out-performed fresh unmodified ZSM-5 in terms of hydrocarbon yield; however, Ni/ZSM-5 and Cu/ZSM-5 in hydrogen produced comparable hydrocarbon yields to ZSM-5 while reducing coke formation.

中文翻译：

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在惰性和氢气氛中使用金属改性的 ZSM-5 催化剂进行催化快速热解

摘要 这项工作的目的是确定氢活化金属对加氢和不加氢的 ZSM-5 催化快速热解的影响。采用初湿法制备金属铝摩尔比为2的Ga-、Ni-、Cu-、Co-和Pt-改性的ZSM-5催化剂。通过分析热解 (Py-GC-MS) 评估催化剂的碳氢化合物和含氧化合物的产率和失活，并在更大的固定床反应器中制备用于表征的反应后催化剂。在惰性气氛中，碳氢化合物产率与焦炭形成和强酸位密度之间存在线性相关性，金属的主要影响是ZSM-5活性位点的吸留，导致碳氢化合物和焦炭产率成比例降低. 随着氢的加入，几种金属（Pt、Ni、Cu, Co) 活化氢并进一步减少焦炭的形成，从而提高碳氢化合物与焦炭的比例。在碳氢化合物产率方面，没有金属改性的催化剂优于新鲜的未改性 ZSM-5；然而，Ni/ZSM-5 和 Cu/ZSM-5 在氢气中产生的碳氢化合物产率与 ZSM-5 相当，同时减少了焦炭的形成。