【摘要】 利用差热分析（ＤＴＡ） 和程序升温还原（ＴＰＲ） 技术研究了活性炭担载钼基催化剂在制备和预处理过程中的性质变化。ＤＴＡ结果表明，催化剂在焙烧过程中产生了新相，这种新相与活性组分和载体间的相互作用有关，助剂Ｋ和Ｎｉ 的引入对这种相互作用有明显的影响。Ｋ／Ｃ样品的ＴＰＲ结果表明，Ｋ 本身不被还原，但它可以改变催化剂中其它物种的还原行为。Ｃ 担载Ｍｏ 基催化剂的ＴＰＲ谱一般由四个正峰和一个负峰组成，正峰归属为不同Ｍｏ 物种和载体本身（ 包括其中的某些杂质）的还原，负峰则归属于氧化的Ｃ载体表面脱附出的ＣＯ，Ｍｏ 担载到活性炭上后变得更加难还原了。Ｋ 的引入大大促进了低温下可还原Ｍｏ 物种（ 主要是八面体Ｍｏ） 的形成，而抑制了那些仅在高温下才能被还原的Ｍｏ 物种（ 主要是四面体Ｍｏ） 的产生。这可能是影响催化剂在ＣＯ加氢反应中的选择性的一个重要因素。更多还原

【Abstract】 Differential Thermal Analysis (DTA) and Temperature Programmed Reduction (TPR) techniques have been employed to study the property change of the carbon supported molybdenum based catalysts during the preparation and pretreatment process. It is shown from the DTA results that a new phase, which is related to the interaction between the active component and the support, may be formed during the calcination of the C supported Mo catalyst. The introduction of the K and Ni promoters has noticeable effects on the interaction. The TPR results from the K/C samples indicate that K is not itself reduced, but it may modify the reduction behavior of other metal compounds. The TPR spectra of C supported Mo based catalysts generally consist of four positive peaks and one negative peak. The positive peaks are attributed to the reduction of different Mo species and the support itself (including some of its impurities). The negative peak is contributed to CO desorption from the surface of the oxidized carbon support. The Mo is more difficult to be reduced after being supported onto the carbon support. The introduction of K greatly promotes the formation of Mo species reducible at relatively low temperatures while it retards the generation of Mo species that are reducible only at high temperatures. This may be an important reason that is responsible for the selectivity of the catalysts in CO hydrogenation.更多还原