Chemical Science and Engineering is an international, peer-reviewed open access journal dedicated to advancing research the field of chemical science and engineering. The journal provides a rapid publication process to ensure wide dissemination of high-quality articles to scientists, professionals, and interested individuals worldwide. Our goal is to serve as an efficient, reliable, and trusted platform for scholars and readers, publishing cutting-edge research in the field.
Abstract: To implement mercury pollution prevention and control requirements and address the toxicity and pollution issues of traditional mercury catalysts in the calcium carbide-acetylene method for vinyl chloride synthesis, it is crucial to develop highly efficient and stable mercury-free catalysts suitable for existing processes, overcoming current limitations such as low activity and poor stability of available alternatives. Using pre-treated coal-based activated carbon as the carrier, non-precious metal copper as the main active component, and phosphoric acid and N-methylpyrrolidone as additives, a mercury-free catalyst was prepared, and its activity was evaluated in a fixed-bed reactor. The results show that under the reaction conditions of 100°C, an empty-bed contact time of 51 h-1, and n(HCl)/n(C2H2)=1.05, the mercury-free catalyst exhibited excellent catalytic performance. During a 196-hour catalyst test operation, the acetylene conversion reached 98.1%, and the vinyl chloride selectivity reached 99.29%.Abstract: To implement mercury pollution prevention and control requirements and address the toxicity and pollution issues of traditional mercury catalysts in the calcium carbide-acetylene method for vinyl chloride synthesis, it is crucial to develop highly efficient and stable mercury-free catalysts suitable for existing processes, overcoming current limita...Learn More
Abstract: The decarbonization of the aviation sector requires scalable, drop-in sustainable aviation fuels (SAFs) capable of meeting stringent performance specifications while achieving substantial lifecycle greenhouse gas reductions. Among certified SAF pathways, the upgrading of waste lipids—such as used cooking oil, animal fats, and acid oils—via catalytic hydroprocessing has emerged as the most technologically mature and commercially deployed solution. Owing to their intrinsic molecular similarity to long-chain hydrocarbons, triglycerides and free fatty acids provide a structurally favorable platform for jet fuel production. However, compositional heterogeneity, high free fatty acid content, contaminant-induced catalyst deactivation, and hydrogen-intensive deoxygenation pose significant upgrading challenges. Catalytic conversion toward jet-range hydrocarbons involves an integrated network of hydrogenation, hydrodeoxygenation, decarboxylation/decarbonylation, hydroisomerization, and selective hydrocracking reactions. Balancing hydrogen efficiency, carbon retention, and product selectivity within the C8–C16 range is central to achieving aviation-grade fuel specifications. Advances in multifunctional metal–acid catalysts, hierarchical porous materials, and hydrogen management strategies are improving jet fuel yield and process stability. Although feedstock availability limits long-term scalability, waste lipid valorization provides a critical near-term pathway for aviation decarbonization and serves as a technological foundation for future SAF innovations. Continued progress in catalyst design, renewable hydrogen integration, and process intensification will determine its evolving role within a low-carbon aviation ecosystem.Abstract: The decarbonization of the aviation sector requires scalable, drop-in sustainable aviation fuels (SAFs) capable of meeting stringent performance specifications while achieving substantial lifecycle greenhouse gas reductions. Among certified SAF pathways, the upgrading of waste lipids—such as used cooking oil, animal fats, and acid oils—via catalyti...Learn More
