Vikrant Kumar, Kim Ki-Hyun
Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea.
Department of Civil and Environmental Engineering, Hanyang University, 222 Wangsimni-Ro, Seoul 04763, Republic of Korea.
Sci Total Environ. 2023 Dec 15;904:166882. doi: 10.1016/j.scitotenv.2023.166882. Epub 2023 Sep 9.
Furfural (FF: aldehyde derivable from lignocellulosic biomass) has been widely recognized as a versatile building block for eco-friendly and sustainable applications to reduce industrial reliance on fossil-fuel carbon sources. Hydrogenation of FF, in particular, is recognized as one of the most effective routes for producing various value-added chemicals (e.g., furfuryl alcohol and 2-methylfuran). The gas-phase FF hydrogenation reaction offers economic and environmental advantages over its liquid-phase counterpart in conversion efficiency, product selectivity, and kinetics. The operation of the former does not require high hydrogen pressures or hazardous solvents while not generating undesirable by-products (due to reduced selectivity toward the ring-opening reaction). In this context, the utility of noble and non-noble metal catalyst systems has been recognized for their potential to induce effective FF hydrogenation in the gas phase. The present review addresses current understandings and recent developments in research on gas-phase FF hydrogenation and the factors governing the performance of metal-based catalysts (e.g., materials and surface chemistry; conversion efficiency; product selectivity; and the mechanisms, pathways, and kinetics of the associated reactions). Current shortcomings and research avenues are also discussed to help establish a roadmap for future development of the gas-phase FF hydrogenation technology and associated disciplines. Overall, the present review is expected to offer much-needed insights into the scalability of metal-based catalytic systems for efficient FF hydrogenation in the gas phase.
糠醛（FF：一种可从木质纤维素生物质中衍生得到的醛）已被广泛认为是一种通用的基础原料，可用于环保和可持续应用，以减少工业对化石燃料碳源的依赖。特别是FF的加氢反应，被认为是生产各种增值化学品（如糠醇和2-甲基呋喃）的最有效途径之一。与液相反应相比，气相FF加氢反应在转化效率、产物选择性和动力学方面具有经济和环境优势。前者的操作不需要高氢气压力或有害溶剂，同时也不会产生不良副产物（由于对开环反应的选择性降低）。在这种背景下，贵金属和非贵金属催化剂体系因其在气相中诱导有效FF加氢的潜力而受到认可。本综述阐述了目前对气相FF加氢研究的认识和最新进展，以及影响金属基催化剂性能的因素（如材料和表面化学、转化效率、产物选择性以及相关反应的机理、途径和动力学）。还讨论了当前的不足和研究方向，以帮助制定气相FF加氢技术及相关学科未来发展的路线图。总体而言，本综述有望为气相中高效FF加氢的金属基催化体系的可扩展性提供急需的见解。
