基于Lewis酸催化机制设计合成丙烷脱氢氧化物催化剂

丙烯是石油化工基本原料其需求量逐年增长，丙烷脱氢是生产丙烯非常有竞争力的路线，正成为石化产业关注的焦点。为了突破传统Pt基催化剂成本高和Cr基催化剂环境污染等问题，本项目基于对Lewis酸催化脱氢机制的认识，创制高效、经济、环境友好的丙烷脱氢酸性氧化物催化材料，包括负载型本征Lewis酸性氧化物和掺杂型缺陷Lewis酸性氧化物，发展软化学可控合成策略在多尺度上调控催化剂的多级结构，建立催化剂的构-效关系，为催化材料设计合成提供科学基础。通过对合成条件的优化，开发出活性好、选择性高和稳定性强的两类氧化物催化剂，在反应温度630度以下、H2/C3H8比小于0.50、气体空速大于800h-1的反应条件下，单程转化率大于40%，选择性大于90%，且催化剂能完全再生，为新一代丙烷脱氢制丙烯技术的开发奠定理论基础和技术支撑。

Propylene is a basic material in the petrochemical industry and its market demand is increasing each year. Propane dehydrogenation is an economical, feasible and effective route for the production of propylene, which has recently attracted lots of attention in the field of petrochemical industry. Although Pt and Cr based catalysts have been commercialized for propane dehydrogenation process, the high cost of Pt and toxic Cr significantly limit their wide application. In order to overcome these problems, this proposal aims at the development of novel metal oxide catalysts for propane dehydrogenation based on Lewis acid catalyzed dehydrogenation mechanism. The catalysts will be controlled synthesized from soft chemistry approach in order to precisely tune their micro-structure at different levels, and the structure-activity relationship will be established, which will provide basic understanding for the design and synthesis of propane dehydrogenation catalyst. Upon the optimization of preparation parameters, efficient metal oxide catalysts with high activity, selectivity and stability will be finally achieved, which will deliver conversion above 40% and selectivity above 90% under the reaction temperature below 630 C, H2/C3H8 ratio below 0.5 and gas hourly space velocity above 800 h-1; meanwhile the deactivated catalyst is completely regenerable. Therefore, the study in this proposal will provide fundamental knowledge and technology solution for the development of a new generation of catalyst for propane dehydrogenation.