可回收再生NiO/NaBr催化剂蒸汽重整甲醛制氢

采用超临界水热合成法制备了系列可循环回收再生的NiO/NaBr催化剂,用于蒸汽重整甲醛制氢,并结合XRD、N_(2)吸附/脱附、SEM、XPS、H_(2)-TPR、in situ DRIFTS等表征技术,分析了NiO/NaBr催化剂的物相结构、比表面积、微观形貌、元素价态、氧化还原性质及蒸汽重整反应瞬态。结果表明:负载量为1%~5%的NiO/NaBr催化剂均能高效蒸汽重整制氢,2%的NiO/NaBr在450℃时表现出最佳的制氢选择性(104%),甲醛转化率接近100%,一次再生后的催化剂制氢性能可恢复到新鲜水平;NiO/NaBr催化剂表面结构密实,表面积较小(<1 m^(2)·g^(-1)),突破了小比表面催化剂难以获得高质量活性的局限;NiO/NaBr催化剂蒸汽重整甲醛为表面快速反应过程,NiO在此制氢过程中被还原为Ni,并不影响催化活性;NaBr不仅吸附甲醛并形成聚甲醛,还能使催化剂保持较好的低温氧化还原性质及制氢性能。

复杂弧形钢结构高精度测量放线技术

本文以某工程“四馆一环”复杂弧形钢结构施工测量为例,将复杂弧形钢结构测量分平面、高程两部分,辅助结合BIM平台,使用Tekla软件建立钢构三维模型,保证了钢结构平面位置和标高的准确性,提高了安装效率,实现了复杂弧形钢结构高精度测量放线。

The Development of Green Design and Research on Product Design for Recycling

The paper analyze and comprehensive evaluate on the characteristics of the product life cycle in each link of the green product design and the life cycle, has obtained a series of design green design optimization method. In the choice of materials, this paper presented a method for the re-combination of recycled materials. In the recovery of the product it proposes the establishment of recycling system, and expounds the concept upgrade recovery. Design and manufacturing of green products and green recycling industry is the two most important link in green circular economic system, whether or not the coordinated development of the two sectors, is the key to the success or failure of the strategy of sustainable development.