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    二氧化碳转化制合成气和甲醇的研究进展

    Research progress on conversion of carbon dioxide to syngas and methanol

    • 摘要: 在全球碳中和战略深入推进的背景下,二氧化碳(CO2)减排已成为化工行业绿色低碳转型的核心任务之一。作为高碳排放的重点领域,化工产业亟需突破传统“高碳锁定”路径,将CO2从废弃物转变为可资源化利用的战略原料。当前,CO2化工利用主要聚焦于合成气平台与甲醇直接合成2条主线,其中甲烷干重整(DRM)、逆水煤气变换(RWGS)及CO2加氢制甲醇3类技术路径最受关注。研究表明,这些路径在热力学、反应机理与催化剂性能方面均面临显著挑战。DRM虽能协同消纳CH4与CO2,但其强吸热特性要求高温操作,导致能耗高、设备要求严苛,且镍基催化剂易因积碳与烧结快速失活;贵金属虽稳定性好,却受限于成本。RWGS反应可在中高温下将CO2高效转化为CO,但副反应(如甲烷化)竞争激烈,对催化剂选择性提出更高要求,且高温仍加剧催化剂失活。相比之下,CO2直接加氢制甲醇在热力学上更适宜低温进行,但受制于低平衡转化率及反应生成水对铜基催化剂的水热失活效应。近年来,In2O3、ZnO-ZrO2等新型氧化物催化剂展现出优异的甲醇选择性与长期稳定性,为技术突破提供了新方向。然而,经济性仍是制约大规模商业化的瓶颈。当前,绿氢成本是CO2加氢路径的主要成本,叠加CO2捕集费用,使得绿色甲醇或合成气产品价格远高于传统化石路线。即使在优化工艺条件下,其市场竞争力仍严重依赖可再生能源电价下降、电解槽效率提升及碳定价机制完善。政策层面,强有力的财政激励是弥合成本缺口、加速示范项目落地的关键。长远来看,实现CO2高效高值化利用需多维协同:一方面通过单原子催化、界面工程等前沿催化材料设计提升催化剂耐久性与活性;另一方面推动绿氢供应链降本,并构建统一透明的碳核算与认证体系。只有技术突破、成本下降与政策支持形成合力,CO2化工利用才能真正从“潜力路径”迈向“主流方案”,为全球碳中和目标提供切实可行的工业支撑。

       

      Abstract: Amid the global strategic push for carbon neutrality, reducing carbon dioxide (CO2) emissions has become a central task in the green and low-carbon transformation of the chemical industry. As a major carbon-intensive sector, the chemical industry urgently needs to break away from conventional, carbon-locked pathways and redefine CO2 from a waste product into a strategic raw material for resource utilization. Currently, CO2 chemical utilization primarily focuses on two main platforms: syngas and direct methanol synthesis. Among these, three technological pathways—dry reforming of methane (DRM), reverse water-gas shift (RWGS), and CO2 hydrogenation to methanol—have attracted the most attention. Research indicates that these pathways face significant challenges in thermodynamics, reaction mechanisms, and catalyst performance. Although DRM can synergistically consume both CH4 and CO2, its strongly endothermic nature requires high-temperature operation, leading to high energy consumption, stringent equipment requirements, and rapid deactivation of nickel-based catalysts due to coking and sintering. Noble metals offer better stability but are limited by cost. The RWGS reaction efficiently converts CO2 to CO at medium-to-high temperatures but faces intense competition from side reactions such as methanation, placing higher demands on catalyst selectivity, while high temperatures still exacerbate catalyst deactivation. In contrast, direct CO2 hydrogenation to methanol is thermodynamically more favorable at lower temperatures but is constrained by low equilibrium conversion and the hydrothermal deactivation of copper-based catalysts by water generated in the reaction. In recent years, novel oxide catalysts such as In2O3 and ZnO–ZrO2 have demonstrated excellent methanol selectivity and long-term stability, offering new directions for technological breakthroughs. However, economic viability remains the core bottleneck constraining large-scale commercialization. Currently, the cost of green hydrogen constitutes the major cost component of CO2 hydrogenation pathways. Coupled with CO2 capture costs, this renders the price of green methanol or syngas products significantly higher than that of traditional fossil fuel-based routes. Even under optimized process conditions, their market competitiveness heavily depends on reductions in renewable electricity prices, improvements in electrolyzer efficiency, and the refinement of carbon pricing mechanisms. At the policy level, strong fiscal incentives are crucial for bridging the cost gap and accelerating the deployment of demonstration projects. In the long term, achieving efficient and high-value utilization of CO2 requires multi-dimensional synergy: on one hand, advancing catalyst durability and activity through cutting-edge catalytic material design, such as single-atom catalysis and interface engineering; on the other hand, driving down costs in the green hydrogen supply chain and establishing a unified, transparent carbon accounting and certification system. Only through the combined force of technological breakthroughs, cost reduction, and policy support can CO2 chemical utilization truly transition from a “potential pathway” to a “mainstream solution”, providing practical and viable industrial support for the global carbon neutrality goal.

       

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