The Promoting Effect of Ga2O3 on a Pt/WO3/ZrO2 Catalyst for n-Heptane Isomerization

Improvement of Activity and Stability of CuGa Promoted Sulfated Zirconia Catalyst for n-Butane Isomerization

“…The presence of C 5 H 12 among the reaction products implies a scission of part of the C 8 intermediates at steady regime, namely, where the very strong acid sites operate. 4,10,17 2, all the catalysts at various Cu content (0.4, 0.6, 0.8, and 1.0 wt %) demonstrate the similar conversion and selectivity at 250 °C. It is obvious that Cu content has little effect on selectivities to C 1 −C 3 alkanes.…”

“…The main products for n -butane isomerization are isobutane and propane in addition to very small amounts of methane, ethane, and pentanes as secondary products in Table . The presence of C 5 H 12 among the reaction products implies a scission of part of the C 8 intermediates at steady regime, namely, where the very strong acid sites operate. ,, The greater abundance of C 3 H 8 over C 5 H 12 for CuGa/SZ suggests that the reaction is probably more complex, since simple cleavage of C 8 intermediate should produce equal amounts of C 3 and C 5 alkanes throughout the reaction. Further cracking of C 5 in C 2 and C 3 alkanes cannot be excluded because the C 3 /C 2 molar ratio (0.09/0.10) is almost equal on CuGa/SZ catalyst.…”

Effect of W Content on Structure and Catalytic Performance of Pt/GaWZrOx Catalysts in Glycerol Selective Hydrogenolysis

“…进一步的研究发现, 在用偏钨酸铵浸渍氢氧化 锆制备的 WO 3 /ZrO 2 固体酸中掺杂少量第 IIIA 主族元素 Al 或 Ga, 能够提高 WO 3 /ZrO 2 和 Pt/WO 3 /ZrO 2 催化剂在 丁烷异构化反应中的活性和稳定性, 而且 Ga 掺杂比 Al 掺杂更为有效 [15] . 华伟明等 [16] 发现, 在 WO 3 /ZrO 2 固体 酸中掺杂少量 Ga 能够稳定四方相 ZrO 2 , 提高比表面积, 进一步增加 Brønsted 酸量, 提高 Brønsted 酸量/Lewis 酸 量之比, 从而显著提高了 Pt/WO 3 /ZrO 2 固体酸催化剂在 正庚烷异构化反应中的活性和稳定性.…”