摘要
KBH_4为一种强还原剂与水发生反应,产生氢气和水溶性硼酸钾。该反应即使不添加任何催化剂仍可进行,但由于反应过程中pH值的不断升高而停止,只有加入适量的催化剂,才能使反应延续,因此,为达到足够快的析氢速度,寻求和制备合适的催化剂成为人们关注的问题。以蜂窝陶瓷(2MgO_2·Al_2O_3·SiO_2)为载体,利用钛酸丁酯水解法在载体表面涂敷TiO_2后,用浸渍法负载铁盐,经500℃焙烧及硼氢化钾(KBH_4)浸渍后,合成了Fe-B/陶瓷催化剂。该催化剂常温下具有优良的催化析氢性能。XPS研究结果表明,元素B的引入有利于提高催化剂催化析氢性能,原因在于催化剂经KBH_4浸渍后,催化剂表面氧化态铁被还原为元素态铁,同时,由于元素B的引入起到了防止催化剂表面元素态铁的氧化。利用该催化剂可实现为质子交换膜燃料电池(PEMFC)直接供氢。
KBH4 can react with water as strong reducing agent and produced hydrogen and dissoluble potassium borate. The reaction can process without any catalyzer,but in the course of the reaction it can be stop because pH incessant increase,the reaction can go on only in the function of catalyzer. Thus for achieving enough rapidity of hydrogen evolution, looking for and preparing appropriate catalyzer becoming an attention matter. Fe-B/cordierite catalyzer was synthesized with cordierite coated with TiO2 as carrier, supporting iron by soakage, then baking at 500℃ and soaking in KBH4. It had superior performance of hydrolysis for borohydride. X ray photoelectron speetroscopy（XPS）results showed that element B was beneficial to improve the performance of hydrogen evolution, because the catalyzer after soaking in KBH4, the ferric oxide on the surface of the catalyzer was deoxidized as iron,and the B played an important role in preventing the oxidation of iron. It can be directly used as a fuel to proton exchange membrane fuel celI（PEMFC）.
出处
《化工新型材料》
CAS
CSCD
北大核心
2015年第3期187-189,共3页
New Chemical Materials
基金
内蒙古广播电视大学科学研究一般课题(RTVUg201105)
关键词
催化剂
水解析氢
XPS分析
catalyzer,catalytic hydrogen,XPS analysis
