Pd Catalyst Formaldehyde To Produce Hydrogen At Room Temperrature

Hydrogen is a kind of clean energy, because of its high calorific value, no pollution and so on. A series of advantages is known as the "energy currency" at 21 st century.Hydrogen is mainly hydrocarbon reforming, hydrogen production by water, biological hydrogen production and hydrogen catalytic organic products, etc. Catalytic formaldehyde to produce hydrogen is a new kind of efficient method to produce new energy and metal nanoparticles in alkaline medium can catalytic hydrogen at room temperature, formaldehyde and produce hydrogen does not contain carbon and oxygen compounds such as carbon monoxide and carbon dioxide. Because most of the catalyst for the precious metal catalyst, in order to reduce the dosage of the catalyst increased catalytic activity of catalysts, choose different carrier different composite catalyst was prepared.By synthesis of Pd nanoparticles immobilized on Bi OCl support by the impregnation-reduction method is reported at room temperature. The catalytic performance of formaldehyde were studied at room temperature, and compared with pure Pd nanoparticles catalytic performance. The results show that the Pd/BiOCl catalyst under the condition of effectively reduce the dosage of precious metal Pd（only 2 wt%）.However, Pd/BiOCl showed higher than pure Pd nanoparticles catalytic performance of the experiment to produce hydrogen. In addition, by further optimization of formaldehyde concentration, sodium hydroxide concentration, reaction temperature and oxygen concentration parameter. Pd/BiOCl catalytic oxidation experiment of hydrogen production rate can reach 200 mL/（min*gcat.）. Further research results show that the Pd/Bi OCl catalytic experiment to produce hydrogen reaction activation energy was only15.2 k J/mol, far lower than without catalyst formaldehyde to produce hydrogen activation energy under the condition of 65 k J/mol.Quantum-sized Pd dots decorated ultra-thin anatase Ti O₂ nanosheets with exposed（001） facets exhibit the highly efficient catalytic activity for hydrogen generation from formaldehyde solution at room temperature, which is much higher than that of traditional Pd/Ti O₂（Degussa P25） and pure Pd nanoparticles. By further optimizing the reaction parameters, the hydrogen generation rates could reach up to 250 m L/（min*gcat.）and keep consistent for ten hours.In order to further enhance the catalytic activity, reduce the dosage of precious metals. the active sites rate of hydrogen generation is determined to be 14.2L/（min*gmetal）, and the TOF for the CuPd/CNTs is calculated to be 4100 h-1 at 298 K.This good performance of CuPd/CNTs results from the small size and high dispersion of the Cu Pd alloy nanoparticles, especially, the modified electronic structure of Pd in the CuPd/CNTs composite. Owing to its high efficiency and at room temperature, it has been considered that this hydrogen production system could serve as an alternate technique for supplying hydrogen in practical applications.