碘化氢分解用Pt/活性碳催化剂制备与表征

PREPARATION AND CHARATERIZATION OF PLATINUM/ACTIVATED CARBON CATALYSTS FOR HIDECOMPOSITION

为了提高碘化氢的分解效率,采用化学镀法制备了系列活性碳(记为AC)负载铂催化剂,利用XRD、BET、ICP和TEM等分析技术对不同铂负载量催化剂的结构、比表面积、组成和金属铂颗粒的大小进行了表征。在固定床反应装置上考察了催化剂的碘化氢分解催化活性,研究了铂负载量和反应温度对催化剂活性的影响。研究结果表明,采用化学镀法成功实现了纳米金属铂粒子在活性碳表面的负载,当负载量为5%时,催化剂的活性最好,500℃时,碘化氢的转化率可达21.4%,接近该条件下的平衡转化率(约23%)。

A series of the activated carbon supported platinum catalysts were prepared by the electroless plating method. Their structures, surface areas, morphologies and compositions were characterized by XRD, BET, TEM and ICP, respectively. Their catalytic activities for the decomposition of HI were evaluated in a fixed bed reactor. The XRD and TEM results showed that the nano-particles of the metallic platinum were successfully deposited on the surface of the activated carbon supports by the electroless plating method. It may be concluded that the Pt/Activated carbon catalyst containing 5wt%Pt showed the optimum catalytic properties for HI decomposition owing to the high dispersion of the platinum nanoparticles on the activated carbon supports. At 500℃, the conversion rate of HI on the 5wt% Pt/Activated carbon was 21.4%, which is close to the equilibrium decomposition ratio of HI （about 23% ）.