NiPd/TiO2催化剂的制备及其催化甲酸分解制氢性能

Preparation of NiPd/TiO2 catalysts and their performance in catalytic hydrogen production by formic acid decomposition

摘要:

高效、清洁且无毒无害的催化剂是实现以甲酸(HCOOH)为化学储氢材料分解制氢的重点。本文采用水热法在453K的条件下制备TiO₂载体,再通过浸渍法向其中加入总量为0.1 mmol的NiCl₂.6H₂O和K₂PdCl₄金属溶液,将活性组分Ni、Pd负载到TiO₂载体上合成NiPd/TiO₂催化剂,并探究其对催化甲酸分解制氢的性能的影响。探究结果表明,在光照条件下,NiPd/TiO₂催化剂中,当金属Ni:Pd比例为2:8时,催化剂的反应转化频率(TOF)值最大,此时催化剂的 TOF 为3528 h_-1^,且该催化剂上甲酸分解的活化能(E_a)为53.9 kJ/mol。关键词：镍钯催化剂；甲酸；分解制氢；二氧化钛；光照中图分类号：TQ630 文献标识码： A 文章编号：

Abstract:

Efficient, clean and non-toxic and non-hazardous catalysts are the focus to realize the decomposition of formic acid (HCOOH) as chemical hydrogen storage material for hydrogen production. In this paper, TiO₂ carriers were prepared by hydrothermal method at 453 K, and then NiCl₂.6H₂O and K₂PdCl₄ metal solutions with a total amount of 0.1 mmol were added to them by impregnation method to synthesize NiPd/TiO₂ catalysts by loading the active components Ni and Pd onto TiO₂ carriers, and to investigate their effects on the performance of catalytic formic acid decomposition for hydrogen production. The results of the investigation showed that the reaction conversion frequency (TOF) value of the NiPd/TiO₂ catalyst was the largest when the metal Ni:Pd ratio was 2:8 under the catalysis of light, at which the TOF of the catalyst was 3528 h_-1^{, and the activation energy (}E_a) of formic acid decomposition on this catalyst was 53.9 kJ/mol.