Acidic properties of nickel sulfate supported on TiO2–ZrO2 and catalytic activity for acid catalysis

Effect of Al2O3Addition and WO3Modification on Catalytic Activity of NiO/Al2O3-TiO2/WO3for Ethylene Dimerization

“…The specific surface areas of 20NiO/ 5Al 2 O 3 -TiO 2 /WO 3 catalysts containing different WO 3 contents and calcined at 400 °C for 1.5 h are listed in 50-52 Figure 6 shows the infrared spectra of ammonia adsorbed on 20NiO/5Al 2 O 3 -TiO 2 /15WO 3 catalyst evacuated at 400 °C for 1 h. For 20NiO/5Al 2 O 3 -TiO 2 /15WO 3 , the band at 1446 cm −1 is the characteristic peak of ammonium ion, which is formed on the Brönsted acid sites. The absorption peak at 1611 cm −1 is contributed by ammonia coordinately bonded to Lewis acid sites, [50][51][52] indicating the presence of both Brönsted and Lewis acid sites on the surface of 20NiO/5Al 2 O 3 -TiO 2 /15WO 3 catalyst. Other samples having different NiO and WO 3 contents also showed the presence of both Lewis and Brönsted acids.…”

“…This is because the initial product of ethylene dimerization is 1-butene. 4,9,50 Therefore, the initially produced 1-butene is also isomerized to 2-butene during the reaction time. 18,19,50,51 Effect of WO 3 modification on catalytic activity.…”

“…4,9,50 Therefore, the initially produced 1-butene is also isomerized to 2-butene during the reaction time. 18,19,50,51 Effect of WO 3 modification on catalytic activity. Recently, it has been reported that metal oxide modified with WO 3 can be used as an alternative catalyst in reactions requiring strong acid sites.…”

Physicochemical and Catalytic Properties of NiSO4/CeO2-ZrO2Catalyst Promoted with CeO2for Acid Catalysis

“…5,30,33 Figure 8 shows the infrared spectra of ammonia adsorbed on 10-NiSO 4 /1-CeO 2 - Table 1. Surface area and acidity of NiSO4/1-CeO2-ZrO2 catalysts containing different NiSO4 contents and calcined at 600 of ammonium ion, which is formed on the Brönsted acid sites and the absorption peak at 1612 cm −1 is contributed by ammonia coordinately bonded to Lewis acid sites, 5,30,33 indicating the presence of both Brönsted and Lewis acid sites on the surface of 10-NiSO 4 /1-CeO 2 -ZrO 2 sample. Other samples having different nickel sulfate contents also showed the presence of both Lewis and Brönsted acids.…”

“…Among them sulfated oxides, such as sulfated zirconia, titania, and iron oxide exhibiting high thermostability, superacidic property, and high catalytic activity, have evoked increasing interest. 1,2,5 The strong acidity of zirconia-supported sulfate has attracted much attention because of its ability to catalyze many reactions such as cracking, alkylation, and isomerization.…”