康熙《皇城宫殿衙署图》解读(下)*

以尿素为沉淀剂,采用负压沉积沉淀法将Au负载于不同载体,分别制备了Au/HZSM-5、 Au/SiO_2及Au/Al_2O_3催化剂.采用X射线粉末衍射、透射电镜、 NH_3-程序升温脱附、红外羟基和原位吸附吡啶红外羟基等技术对催化剂进行了表征,探究了Au对不同载体的作用,并用脉冲微反装置评价了催化剂对正丁烷脱氢反应的性能.结果表明,相较于其他载金催化剂, Au/HZSM-5酸性较强, Au与HZSM-5相互作用后会形成Si-O(H)-Au基团,该活性相对正丁烷脱氢起到一定的促进作用.

Reading the Map of Government Offices in the Imperial Palace from the Kangxi period (Part 3)

Au/HZSM-5, Au/SiO₂ and Au/Al₂O₃ catalysts were prepared by using urea as precipitator by negative pressure deposition-precipitation method in this paper. The catalyst was characterized by X-ray diffraction, TEM, NH₃-TPD, infrared hydroxy and in-situ adsorption of pyridine infrared hydroxyl. The catalyst was used in n-butane reaction system to evaluate the catalytic performance of the catalyst. The results have shown that Au could combine with HZSM-5 groups to form a new acidic Si-O-Au structure, and the acid strength of catalyst is obviously increased, which could promote the dehydrogenation of n-butane.