本文選題：硼氫化鈉 + 氨硼烷��； 參考：《云南師范大學(xué)》2017年碩士論文

【摘要】：氫氣因具有儲量豐富、能量密度高、環(huán)境友好等優(yōu)勢,被認(rèn)為是一種可再生的綠色新能源。要使氫氣得到廣泛的運(yùn)用,首先需要解決的問題是如何高效、安全地儲存和運(yùn)輸氫氣�；瘜W(xué)儲氫材料(NaBH_4,NH_3BH_3,N_2H_4,HCOOH等)具有儲氫密度高、體積小等優(yōu)勢能夠有效地解決上述問題。要使化學(xué)儲氫材料快速高效的釋放氫,最有效的方法就是找到一種廉價高效的催化劑。過渡金屬磷化物作為催化化學(xué)儲氫材料水解產(chǎn)氫的催化劑被研究者廣泛研究。本論文以開發(fā)高效、廉價的過渡金屬磷化物為立足點(diǎn),制備了多種過渡金屬磷化物,并用來催化氨硼烷和硼氫化鈉水解,同時找到了最佳的水解制氫條件。具體研究結(jié)果如下:1、以次磷酸鈉為磷源,硝酸鈷、氯化鈷等廉價金屬鹽為金屬源,制備了一系列的過渡金屬磷化物(CoP、Co_2P、Ni_2P、Cu_3P和FeP)納米粒子,并用XRD、SEM、TEM等進(jìn)行了表征。2、以Co_2P為催化劑催化氨硼烷水解釋氫,并對反應(yīng)條件進(jìn)行優(yōu)化。研究表明,催化劑的用量、氨硼烷的濃度、堿濃度及溫度對Co_2P催化氨硼烷水解釋氫都有較大的影響。3、研究了相同條件下,用多種過渡金屬磷化物催化NaBH_4水解制備氫氣。經(jīng)過比較我們發(fā)現(xiàn),室溫下,CoP的催化效果最佳,Co_2P次之,FeP的效果最差。4、與其他已報道的Co-P催化NaBH4水解制氫相比,CoP納米粒子的催化活性和可循環(huán)性較好。25℃時和35℃時,CoP催化NaBH_4水解的TOF值依次為3097.62 mL·min~(-1)·g~(-1),4704.14 m L·min~(-1)·g~(-1)。5、用Co_2P納米粒子作為催化劑,來催化NaBH4水解制氫,通過對反應(yīng)條件的優(yōu)化,得到在30℃時,Co_2P催化NaBH_4水解的TOF值為2307.2mL·min~(-1)·g~(-1),在35℃時,其TOF值為3323.4 m L·min~(-1)·g~(-1)。
[Abstract]:Hydrogen is considered to be a renewable green energy source because of its rich reserves, high energy density and environmental friendliness. How to store and transport hydrogen efficiently and safely is the first problem to be solved in order to make hydrogen widely used. The chemical hydrogen storage material NaBH _ S _ 4 / NH _ 3BH _ S _ 3T _ 3N _ 2H _ 2H _ 2H _ 2H _ OH) has the advantages of high hydrogen storage density and small volume, which can effectively solve the above problems. The most effective way to release hydrogen quickly and efficiently from chemical hydrogen storage materials is to find a cheap and efficient catalyst. Transition metal phosphates as catalysts for the hydrolysis of hydrogen storage materials have been widely studied. In this paper, a variety of transition metal phosphates were prepared based on the development of efficient and cheap transition metal phosphates, which were used to catalyze the hydrolysis of aminoborane and sodium borohydride. At the same time, the optimum conditions for the production of hydrogen were found. The specific results are as follows: using sodium hypophosphite as phosphorus source, cobalt nitrate, cobalt chloride and other cheap metal salts as metal sources, a series of transition metal phosphates have been prepared. It was characterized by XRDX SEM TEM et al. Cos _ 2P was used as catalyst to catalyze the interpretation of hydrogen from ammonium-borane water and the reaction conditions were optimized. The results show that the amount of catalyst, the concentration of aminoborane, the concentration of base and temperature have great influence on the hydrogen interpretation of ammonia borane water catalyzed by Co2P. Under the same conditions, the catalytic hydrolysis of NaBH4 with a variety of transition metal phosphates has been studied. After comparison, we found that The catalytic activity of cop was the best at room temperature, followed by FeP. 4. Compared with other reported Co-P catalytic hydrolysis of NaBH4 to produce hydrogen, the catalytic activity and circulability of cop nanoparticles were better than those of other reported Co-P catalysts. 25 鈩，

本文編號：2000542