The sintering of a silica-supported nickel catalyst

摘要: Abstract Changes in the average particle size and distribution (PSD) were monitored during sintering of a silica-supported nickel catalyst. Sintering was carried out nitrogen hydrogen atmospheres from 500 to 800 °C for times varying 1 100 hr. The functions (PSDs) determined both by X-ray single profile analysis transmission electron microscopy excellent agreement. process found occur very rapidly initially then proceeded more slowly at longer temperatures higher than 600 °C. effects temperature on changes PSD be pronounced time. As progresses, PSDs developed long tails larger diameter side. Fitting data power-law gave exponent values 13 14 below 700 hydrogen, respectively. Particle growth became much faster as atmospheres. change 6 atmosphere 4 atmosphere. large obtained indicate that occurs migration mechanism. However, results tend atomic mechanism is predominating.