Core Viewpoint - The article emphasizes the critical role of Sustainable Aviation Fuel (SAF) in achieving net-zero carbon emissions in the aviation industry by 2050, highlighting the importance of green hydrogen in SAF production [3][7]. Group 1: SAF Market Overview - In 2023, global aviation fuel consumption reached 306 million tons, resulting in carbon emissions of 962 million tons, accounting for approximately 2.6% of global carbon emissions [3]. - The International Civil Aviation Organization (ICAO) has set a long-term climate goal to achieve net-zero emissions for international aviation by 2050 [3]. Group 2: SAF Production Technologies - As of May 2025, there are 11 recognized production pathways for SAF, with a maximum blending ratio of 50%. The main processes include HEFA, AtJ, FT, MtJ, and PtL, with MtJ and PtL still undergoing recognition [3]. - It is projected that by 2030, HEFA will dominate SAF production in China, while PtL is expected to become mainstream after 2050 due to its mature technology and near-zero carbon emissions [3]. Group 3: Hydrogen Demand in SAF Production - Different SAF production processes have varying hydrogen requirements. The PtL process requires the most hydrogen, consuming between 0.38 to 0.58 tons of hydrogen per ton of SAF produced [5]. - By the end of 2025, China's SAF projects are expected to have a production capacity of 2.146 million tons per year, primarily using the HEFA process, leading to a hydrogen demand of 172,000 tons [5]. - In an optimistic scenario, hydrogen demand for domestic SAF projects is projected to reach 1 million tons by 2030 and 22 million tons by 2050 as PtL becomes the dominant process [5]. Group 4: Green Hydrogen and Emission Reduction - Utilizing green hydrogen instead of gray hydrogen in SAF production can reduce carbon emissions by over 40% [7]. - As of March 2025, domestic green hydrogen production capacity is estimated to reach 112,400 tons per year, but gray hydrogen remains the preferred choice due to cost advantages and established supply chains [7]. - The transition to green hydrogen is expected to accelerate as costs decrease, policy incentives strengthen, and technology advances [7].