新型丙烷脱氢制丙烯Pt-Sn/Cr2O3/Al2O3催化剂设计，合成及性能研究

Propylene is an important inorganic chemical material. It was produced mainly by the splitting of naphtha. But this technology consumes large energy and costs too much. The production of propylene by catalytic propane dehydrogenation is more economic and social meaning. China is rich in propane resources. Most of propane is used as fuel. So, by catalytic dehydrogenation to get high value-added propylene has very important economical value. At present, the key problem is how to get excellent dehydrogenation catalyst of propane to propylene. The catalysts for propane dehydrogenation to propylene being used are Pt-based (Pt-Sn/Al2O3) and Cr-based (Cr2O3/Al2O3) catalysts. Both the catalysts have short lifetime and their activity and selectivity are not very high. This project attempts to research and develop a novel, high performance Pt-Cr-based (Pt-Cr/Cr2O3/Al2O3) catalyst .It's activity, selectivity and stability will be improved by the modulation of the composition and structure of the catalyst. Especially, mach more attention and efforts mast be put on solving the problem of carbon accumulation, making the catalyst can be used in industrial, the technology of propane dehydrogenation to propylene be more efficient, energy saving and environmental protecting. Finally the increasing needs of our country for propylene will be satisfied.

丙烯是一种重要的有机化工原料，过去通常通过石脑油裂解来生产丙烯，该工艺耗能大、成本高，而使用丙烷脱氢制丙烯经济上更加合理。我国丙烷气资源丰富，大部分被用作燃料，所以将价廉的丙烷通过催化脱氢制得高附加值的丙稀，具有十分重要的经济价值和社会意义。而实现该反应的关键在于获得性能优良的丙烷脱氢催化剂。目前使用的Pt系（PtSn/Al2O3）和Cr系(Cr2O3/Al2O3)催化剂活性和选择性不高，寿命很短。本项目就是试图研发一种新型高效性能优于前两种的Pt-Cr系(PtSn/Cr203/Al2O3)丙烷脱氢催化剂，通过调制催化剂的组成和结构以提高其活性、选择性和稳定性。尤其是要解决催化剂易积碳、寿命短的问题，使之能用于工业化生产，使丙烷脱氢制丙烯工艺更高效、节能、环保。以满足我国对丙烯日益增长的需要。

丙烯作为一种基础化工原料，主要应用在生产聚丙烯、丙烯酸、丙烯醛、异丙醇等化工产品，其重要地位不言而喻。近年来丙烯下游工业发展迅速，丙烯消费量年年创新高，而我国目前的丙烯供应量还远远满足不了市场需求，所以开发新工艺新技术制备丙烯对我国经济发展具有重大的意义。丙烷催化脱氢制备丙烯工艺虽然受到热力学平衡限制，是高温吸热反应，但其具有技术成熟、转化率较高、副产物少的优势，因而受到越来越多的关注。目前使用的Pt系（PtSn/Al2O3）和Cr系(Cr2O3/Al2O3)催化剂活性和选择性不高，寿命很短。本项目现在取得一些重要结果如下：Pt-Sn-Mg/Cr2O3·Al2O3系列催化剂中Mg的最佳负载量为0.6wt.%，确定催化剂Pt-Sn-Mn/Cr2O3·Al2O3系列催化剂中Mn的最佳负载量为0.4wt.%。