Preparation Of MoP And CoMoP Catalysts And Their Catalytic Properties For Hydrogen Production From Formaldehyde

With the rapid development of The Times and the rapid progress of science and technology,people’s life is becoming more and more beautiful.But at the same time,people ignore the protection of the earth’s environmental resources while pursuing a better life,which makes the environmental resources gradually scarce,and the resulting pollution is increasingly serious.In response,scientists are looking for clean energy to replace non-renewable and highly polluting fossil fuels.In recent years,the national strategic level put forward the goal of reaching the carbon peak in 2030 and carbon neutrality in 2060,which promotes the development of new energy vehicles to embrace great opportunities.Hydrogen fuel vehicles,as vehicles using hydrogen energy as energy sources,have also begun to attract wide attention and research.Proton exchange membrane fuel cell(PEMFC),as the main power device of hydrogen fuel vehicle,has a very high requirement on the purity of hydrogen,and hydrogen production from formaldehyde can meet the requirements of PEMFC well because of its pure product.At present,the catalysts used in the process of hydrogen production from formaldehyde are mainly precious metals,but the high price has limited its further development,so it is urgent to find a cheap non-precious metal catalyst as a substitute.This work mainly consists of the following two parts:In the first part,a non-precious metal MoP catalyst was synthesized using sodium hypophosphate and sodium molybdate as raw materials by temperature programmed reduction method.MoP catalyst was used to catalyse hydrogen evolution in alkaline HCHO solution.MoP showed high hydrogen evolution activity and good stability.The composition,structure and morphology of MoP are controlled by changing the calcination temperature of precursor.Better crystal structure and more lattice defects can be formed at an appropriate calcination temperature.When the calcination temperature is 400 ℃,the obtained MoP-400 catalyst exhibits the highest hydrogen evolution activity,which is attributed to its good crystallizability,large specific surface area.and many active sites.In the second part,the Co-doped CoMoP-m catalyst was prepared by temperature programmed reduction method using sodium hypophosphate,sodium molybdate and cobalt nitrate as raw materials.The amount of Co doping can greatly affect the hydrogen evolution performance of catalyst.When Co doping concentration is 1 wt%,the activity of CoMoP-1.0 catalyst is the highest,which is 35 % more active than pure MoP.Cobalt doping not only improves the activity of catalyst,but also improves the stability of catalyst,which can maintain good stability within 8 cycles.The CoMoP-1.0 catalyst was characterized by XRD,XPS,BET,SEM and TEM.