Various characteristics of multi-modified rice husk silica-anchored Ni or Pt nanoparticles as swift catalytic systems in some petrochemical processes

摘要: Abstract Considering the local rice husk (RH) as a renewable source for production of value added silica, new swift catalysts based on extracted silica (RHS) were designed in this work. RHS was texturally tuned by using both CTAB (cationic surfactant) and Span40 (nonionic surfactant). Surfaces xerogel CTAB-templated functionalized with mixed 3-aminopropyltriethoxysilane triethoxymethylsilane situ anchorage Ni or Pt nanoparticles. nanoparticles also immobilized onto Span40-templated surface through dual tuning effect. The as-synthesized samples characterized via N2 physisorption, H2 chemisorption, XRD, FTIR, TEM TGA-DSC techniques applied ethanol dehydrogenation at different temperatures. Anchored embedded protecting organo-functionalized monolayer uniform dispersion profile, displaying higher activity stabilized performance reaction time-on-stream selective acetaldehyde (77.8 63.6% over F-SG-Ni F-CTAB-MS-Ni, respectively). Attached to pendant amine groups appeared spherical shapes larger average sizes low edges corners. They tended aggregate nanocrystallites distorted tetrahedral (111) facets damped less catalytic produce only 17.3% acetaldehyde. RHS-Ni exhibited lower 53.3% acetaldehyde, although high selectivity comparable RHS-Ni.