Syngas production through CO2 reforming of propane over highly active and stable mesoporous NiO-MgO-SiO2catalysts: Effect of calcination temperature

Aqueous phase hydrogenolysis of glycerol with in situ generated hydrogen over Ni/Al3Fe1 catalyst: effect of the calcination temperature

“…They concluded that the formation of NiAl 2 O 4 spinel was beneficial to the activity and stability. Similar tendencies were obtained by Barzegari et al 25 in the dry reforming of propane. They found that the calcined sample at 600 °C displayed the best catalytic performance with the highest Ni dispersion and surface area combined with sufficient basicity.…”

“… 43 However, a further increase in calcination temperature to 750 °C caused a decrease in the FeNi 3 dispersion to 8.8% due to active metal sintering during the activation process. 25 In addition, the FeNi 3 crystallite size increased from 11 to 20 nm when the Ni/Al 3 Fe 1 -750 catalyst was reduced at high temperature (725 °C), and consequently, FeNi 3 dispersion diminished from 8.8 to 4.9%.…”

“…Barzegari et al 25 reported that the active surface area and Ni dispersion were gradually diminished by boosting the calcination temperature from 600 to 700 °C. In addition, the catalyst calcined at 600 °C showed the highest catalytic activity.…”

Enhancing CO and H2 Production in Propane Dry Reforming in Excess of CO2

“…Ye et al observed that titania-based catalysts showed strong chemisorption of CO 2 , which was retained considerably at higher temperatures between 600 and 1200 °C. The CO 2 adsorption over titania-based catalysts is illustrated in Table , and three CO 2 desorption temperature regions of basic sites were recognized over titania-based catalysts. − The first region is the weak basic sites of CO 2 between temperatures 35 and 325 °C, likely related to bicarbonate species, − while the stronger basic sites at higher-temperature CO 2 -TPD at 325–725 °C represented the bidentate carbonate intermediate with strong sites of CO 2 linked with the less oxide coordination state of titania-based catalysts and were likely related to basic surface oxygen anions. ,,− The highest temperature region >725 °C represented the oxycarbonate, which is attributed to strong basic sites and favors high-temperature decomposition. , Specifically, the addition of noble and transition metals to titania-based catalysts led to significantly more basic sites, indicated by the more than 1.7–2.7-fold increase in peak intensity between 35 and 725 °C incorporated with TiO 2 , compared to the original support. The amounts of basic sites decreased in the following order TiO 2 < Zr/Ti < Ir/Ti < Al/Ti < V/Ti, as shown in Table .…”

High catalytic performance of Fe-rich palygorskite clay-supported Ni catalysts for steam reforming of toluene

“…The toluene conversion exhibited an increasing trend (raw–700°C) and subsequently decreased with further increase in CT (700–800°C). The smaller amount of toluene conversion at low CT was probably because of the low dispersion of active sites, which was not conducive to CSRT (Barzegari et al , 2022). The reduction in toluene conversion at a high CT of 800°C was probably due to the severe sintering of Fe-Ni alloys.…”