Nickel phosphorous amorphous film catalyst was prepared by means of electrodeposition on p-type silicon. Effects of H3PO3 content in bath and current density on phosphorous content in the film were studied. With the i...Nickel phosphorous amorphous film catalyst was prepared by means of electrodeposition on p-type silicon. Effects of H3PO3 content in bath and current density on phosphorous content in the film were studied. With the increase of H3PO3 concentration and the decrease of current density, P content was increased remarkably, X-ray dtheaction (XRD) showed that the film containning x (molar fraction)=0.109 P is amorphous.Scanning electrouic microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) wereused to investigate the morphology of the film and the chemical state of Ni, P, O on thesurface.展开更多
Different rare earth （RE=La, Ce, Pr, Nd, Sm, Y） and Cu modified nickel catalysts for hydrogen production from meth-ane decomposition were synthesized by a sol-gel process and method. The catalysts were characterized...Different rare earth （RE=La, Ce, Pr, Nd, Sm, Y） and Cu modified nickel catalysts for hydrogen production from meth-ane decomposition were synthesized by a sol-gel process and method. The catalysts were characterized or analyzed through Brumauer-Emmett-Teller （BET）, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） techniques. And the hydrogen production performance was also evaluated by a fixed-bed and micro-reaction technique with CH4→C＋H2 as a probe reaction. The results showed that rare earth modification had played a great role for nickel catalysts, for example, smaller nickel particles, good thermal stability, high activity, etc. La was the best additive among rare earth modification. The SEM of rare earth modified catalysts showed ordered flower-like structure and rare earth modification made the nickel particles move to the surface of catalysts. In addition, the SEM of nano-carbons was also changed by rare earth modification with long, narrow nano-carbon fibers or tubes obtained. Solid carbon formation was prevented by rare earth modification.展开更多
文摘Nickel phosphorous amorphous film catalyst was prepared by means of electrodeposition on p-type silicon. Effects of H3PO3 content in bath and current density on phosphorous content in the film were studied. With the increase of H3PO3 concentration and the decrease of current density, P content was increased remarkably, X-ray dtheaction (XRD) showed that the film containning x (molar fraction)=0.109 P is amorphous.Scanning electrouic microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) wereused to investigate the morphology of the film and the chemical state of Ni, P, O on thesurface.
基金supported by the Twelfth Five-year National Science and Technology Pillar Program(2012BAE01B02)
文摘Different rare earth （RE=La, Ce, Pr, Nd, Sm, Y） and Cu modified nickel catalysts for hydrogen production from meth-ane decomposition were synthesized by a sol-gel process and method. The catalysts were characterized or analyzed through Brumauer-Emmett-Teller （BET）, X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron microscopy （TEM） techniques. And the hydrogen production performance was also evaluated by a fixed-bed and micro-reaction technique with CH4→C＋H2 as a probe reaction. The results showed that rare earth modification had played a great role for nickel catalysts, for example, smaller nickel particles, good thermal stability, high activity, etc. La was the best additive among rare earth modification. The SEM of rare earth modified catalysts showed ordered flower-like structure and rare earth modification made the nickel particles move to the surface of catalysts. In addition, the SEM of nano-carbons was also changed by rare earth modification with long, narrow nano-carbon fibers or tubes obtained. Solid carbon formation was prevented by rare earth modification.
