(廊坊師范學(xué)院 化學(xué)與材料科學(xué)學(xué)院，廊坊 065000)
摘 要: 以商品化的氧化鋁球?yàn)檩d體，通過(guò)化學(xué)鍍法在其表面沉積金屬鈷，制備不同擔(dān)載量的Co/Al2O3催化劑，并用于催化堿性溶液中硼氫化鈉水解放氫反應(yīng)。考察鈷擔(dān)載量、硼氫化鈉濃度、反應(yīng)溫度、循環(huán)使用次數(shù)對(duì)催化劑性能的影響。通過(guò)掃描電子顯微鏡、能譜儀、X射線衍射分別對(duì)催化劑表面形貌、元素組成和晶相結(jié)構(gòu)進(jìn)行分析。結(jié)果表明：當(dāng)鈷的擔(dān)載量為0.46%(質(zhì)量分?jǐn)?shù))時(shí)，20 ℃下5NaBH4+5%NaOH體系的產(chǎn)氫速率最高，達(dá)3.26 L/(min·g)；反應(yīng)表觀活化能為64.4 kJ/mol；循環(huán)使用4次后，催化劑活性降至初始值的72 %。
關(guān)鍵字: 制氫；鈷催化劑；硼氫化鈉；水解；化學(xué)鍍
（College of Chemistry & Material Science, Langfang Teachers University, Langfang 065000, China）
Abstract:Commercial alumina balls were employed as support material, and metal cobalt was deposited on their surface via electroless plating, resulting in a series of Co/Al2O3 catalysts with different Co loadings. The prepared catalysts were used for hydrogen production from the catalytic hydrolysis of alkaline sodium borohydride solution. In the present work, effects of Co loading, NaBH4 concentration, reaction temperature and recycling times on the catalyst activity were investigated. The surface morphology, element composition and phase structure of catalysts were analyzed by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), respectively. The results show that the optimal Co loading is 0.46% (mass fraction); meanwhile, the 5%NaBH4+5%NaOH solution presents the highest hydrogen generation rate up to 3.26 L/(min·g). The apparent activation energy is 64.4 kJ/mol. Compared with the initial performance, the catalyst activity decreases to 72% after recycling for four times.
Key words: hydrogen production; Co catalyst; sodium borohydride; hydrolysis; electroless plating
