关键词: 二氧化碳, 加氢, 醇, 催化剂, 优化设计

Abstract:

Converting CO₂ into fuels and high-value chemicals through catalytic hydrogenation is an effective strategy to control CO₂ emissions and achieve sustainable energy development. A series of iron-based catalysts modified with Na and S were synthesized using a precipitation method, and the effect of promoter content on catalytic properties and the performance of CO₂ hydrogenation to C₂₊ alcohols was investigated. The Na-S dual promoters can alter the active phase composition and the electronic properties of involved Fe sites, which in turn influence the activation ability towards reactants and CO intermediates, and ultimately affect the catalytic activity and product distribution. Moderate addition of Na and S helped balance the dissociated and non-dissociated CO activation on iron catalysts, which could promote the coupling of alkyl and *CO species and consequently enhance the production of C₂₊ alcohols. The NaS-Fe-3 catalyst achieved 12.8% selectivity for C₂₊ alcohols at a CO₂ conversion of 32%. Iron is generally regarded as an active component for CO dissociation and mainly contributes to hydrocarbon production. Selective synthesis of C₂₊ alcohols over monometallic iron catalysts was rarely reported. The Na-S co-modification to modulate catalytic properties and product distribution, provides new insights into catalyst design and reaction pathway optimization.

Key words: carbon dioxide, hydrogenation, alcohol, catalyst, optimal design