AlTi5B催化富铝合金水解产氢反应——一种高效经济制备氢气的方法  

AlTi5B Catalyzed Hydrogenation Reaction of Al-rich Alloys: an Efficient and Economical Approach for Hydrogen Production

作　　者：汪洪波 谢志雄[1,2] 董仕节 黄海军[3] 高海燕 WANG Hongbo;XIE Zhixiong;DONG Shijie;HUANG Haijun;GAO Haiyan(Hubei Provincial Key Laboratory of Green Materials for Light Industry,Hubei University of Technology,Wuhan 430068,China;School of Materials and Chemical Engineering,Hubei University of Technology,Wuhan 430068,China;The State Key Laboratory of Metal Matrix Composites,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]湖北工业大学绿色轻工材料湖北省重点实验室,武汉430068 [2]湖北工业大学材料与化学工程学院,武汉430068 [3]上海交通大学金属基复合材料国家重点实验室,上海200240

出　　处：《材料导报》2020年第4期62-67,共6页Materials Reports

基　　金：国家自然科学基金(51771071)~~

摘　　要：本实验研究了添加AlTi5B对Al-5Ga-5Sn(质量分数,下同)铝合金与水反应制氢性能的影响。实验结果表明,当AlTi5B质量分数为0.5%时,铝合金的产氢量、产氢速率以及转化率最好。1gAl-5Ga-5Sn-0.5%AlTi 5B铝合金在水温60℃下反应20 min时,产氢量为1170 mL,转化率为96%。当AlTi5B质量分数小于或大于0.5%时,铝合金的产氢量和产氢速率均下降。扫描电镜(SEM)结果显示,加入0.5%AlTi 5B后Al-5Ga-5Sn铝合金的晶粒显著细化。铝晶粒由原来的平均尺寸为100μm的柱状晶变为平均尺寸为30μm的等轴晶。由X射线光电子能谱(XPS)结果可见,Al-5Ga-5Sn-0.5%AlTi5B铝合金比Al-5Ga-5Sn铝合金表面氧化更严重,表明AlTi5B增强了铝合金的化学活性。由电化学测试结果可知,加入0.5%AlTi5B后铝合金的开路电压由原来的-1.27 V降低为-1.39 V。晶粒显著细化、铝合金活性增强和开路电压降低是促进铝合金水解并提高产氢性能的主要原因。This study investigated the impact of AlTi5B introduction on the hydrogen production performance of Al-5 Ga-5 Sn(wt%) alloy in reaction with water. The experimental results demonstrated that Al-5 Ga-5 Sn alloy with 0.5 wt% AlTi5B acquired the best hydrogen production amount, hydrogen yield and conversion rate in hydrogenation reaction. The reaction of 1 g Al-5 Ga-5 Sn-0.5%AlTi5B alloy in water under 60 ℃ for 20 min resulted in a hydrogen production amount of 1 170 mL and a conversion rate of 96%. With a AlTi5B mass fraction of below or above 0.5%, there would be a drop in hydrogen production amount and hydrogen yield of the Al-5 Ga-5 Sn alloy participated hydrogenation reaction. The observation by scanning electron microscopy(SEM) revealed that the grains of Al-5 Ga-5 Sn alloy were remarkably refined after the addition of 0.5% AlTi5B. A alteration in Al crystal grains from columnar crystals with an average size of 100 μm to equiaxed crystals with an average size of 30 μm was observed. The analytic results of X-ray photoelectron spectroscopy(XPS) indicated that Al-5 Ga-5 Sn alloy with 0.5% AlTi5B presented more se-rious surface oxidation than the one without AlTi5B, demonstrating the enhanced chemical activity of Al-5 Ga-5 Sn alloy by AlTi5B. According to the electrochemical test results, the open circuit voltage of Al-5 Ga-5 Sn alloy was reduced from the original-1.27 V to-1.39 V after adding 0.5% AlTi5B. Consequently, main factors that promote the hydrolysis of Al-5 Ga-5 Sn alloy and improve hydrogen production performance lies in significant refined grains, increased activity of Al-5 Ga-5 Sn alloy and reduced open circuit voltage.

关 键 词：AlTi5B 铝合金 催化 水解产氢 

分 类 号：TK91[动力工程及工程热物理]