Zn-ZrO_2/SiO_2非氧化脱氢制无水甲醛的研究  

Research on Zn-ZrO_2/SiO_2 catalyst used in methanol direct dehydrogenation for anhydrous formaldehyde

作　　者：张跃[1] 崔志强[1] 严生虎[1] 刘建武[1] 沈介发[1] 

机构地区：[1]常州大学精细化工研究所,江苏常州213164

出　　处：《现代化工》2011年第2期64-67,共4页Modern Chemical Industry

摘　　要：以Zn-ZrO2/SiO2为催化剂,在微型固定床反应器中用甲醇直接非氧化脱氢制备无水甲醛,考察了催化剂组成、反应温度及质量空速对脱氢反应的影响。结果表明,在进料的甲醇体积分数为35%、反应温度为800 K、质量空速为35 mL/(g.s)的反应条件下,甲醇的转化率达到100%,甲醛的选择性达到63%。结合催化剂的活性评价及X射线光电子能谱、热重等技术显示,采用均匀沉淀法制备的Zn-ZrO2/SiO2催化剂,活性组分能均匀分散在载体上,且对甲醇的非氧化脱氢具有高效的催化作用。助剂ZnO的引入可以有效抑制反应过程中催化剂的烧结,极大程度地增强催化剂的稳定性。In a micro fixed-bed reactor, methanol direct dehydrogenation for anhydrous formaldehyde using composite zirconium-based catalyst Zn-ZrO2/SiO2 is studied. The effects of catalyst composition, reaction temperature, mass space velocity on the dehydrogenation reactions are investigated. The results show that the optimal reaction conditions are as follows：35% of methanol feed concentration, 800 K of reaction temperature,35 mL/（ g ·s） of mass space velocity. Under above conditions, the conversion rate of methanol reaches 100%, the molar selectivity of formaldehyde reaches 63 %. Combined XRD,TG measurements with the catalyst evaluation, the results show that the Zn-ZrO2/SiO2 catalysts prepared by uniform co-precipitation method,in which the active component can disperse uniformly on carrier, exhibit effective and stable catalytic activity for methanol dehydrogenation. ZnO promoter doped into the ZrO2/ SiO2 catalyst can inhibit the sintering of catalyst during the reaction and thus greatly enhance the stability of the catalyst.

关 键 词：甲醇 无水甲醛 直接脱氢 Zn-ZrO2/SiO2催化剂 

分 类 号：O623.511[理学—有机化学] O643.38[理学—化学]