【摘要】：采用分步沉淀過程制得質(zhì)量比m(CuO)∶m(MgO)∶m(Al_2O_3)為25∶26∶49的CuMgAl類水滑石前驅(qū)體,經(jīng)過不同溫度焙燒制得CuMgAl-t催化劑。通過BET、熱重、XRD、H_2-TPR和CO_2-TPD對催化劑進(jìn)行表征,在固定床中考察CuMgAl-t催化劑催化糠醛氣相加氫制糠醇的性能。結(jié)果表明,焙燒溫度影響催化劑活性、穩(wěn)定性及對產(chǎn)物的選擇性,低溫焙燒的催化劑經(jīng)還原后可獲得較多活性中心,高溫焙燒的催化劑表面具有更多的堿性位,CuMgAl催化劑經(jīng)450℃焙燒表面存在適宜的活性中心和堿性位。在常壓、反應(yīng)溫度180℃、氫醛物質(zhì)的量比5∶1、糠醛體積空速0.3h~(-1)的條件下,CuMgAl-450催化劑上糠醛的轉(zhuǎn)化率和糠醇的選擇性分別達(dá)到98.64%和97.66%。
[Abstract]:The CuMgAl hydrotalcite precursor with the mass ratio of m (CuO): m (MgO): m (Al_2O_3) of 25:26:49 was prepared by the step precipitation process and the CuMgAl-t catalyst was prepared by calcination at different temperatures. The catalyst was characterized by BET, TG, XRD,H_2-TPR and CO_2-TPD. The catalytic activity of CuMgAl-t catalyst for furfural gas phase hydrogenation to furfuryl alcohol was investigated in a fixed bed. The results show that the calcination temperature affects the activity, stability and selectivity of the catalyst. The catalyst calcined at low temperature can obtain more active sites after reduction, and the surface of the catalyst calcined at high temperature has more basic sites. There are suitable active sites and alkaline sites on the surface of CuMgAl catalyst calcined at 450 鈩，

本文編號：2430322