Improvement of Activity and Stability of CuGa Promoted Sulfated Zirconia Catalyst for n-Butane Isomerization
Improvement of Activity and Stability of CuGa Promoted Sulfated Zirconia Catalyst for n-Butane Isomerization
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CuGa促进的硫酸化氧化锆正丁烷异构化催化剂活性和稳定性的提高
DOI：
10.1021/acs.iecr.7b04590
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发表时间：
2018
影响因子：
4.2
通讯作者：
Fang Weiping
中科院分区：
文献类型：
--
作者：
Yang Kang;Li Honglin;Zhao Siqi;Lai Shengsong;Lai Weikun;Lian Yixin;Fang Weiping
使用CuGa促进的硫酸化氧化锆（CuGa/SZ）催化剂用于正丁烷异构化为异丁烷具有潜在的价值，作为用于该重要反应的当前催化剂（氯化氧化铝）的替代物。Ga促进了SZ的工作，但很快就失效了。比较了几种相关的催化剂（SZ、Ga/SZ、Cu/SZ和CuGa/SZ）。只有CuGa/SZ表现出最有趣的性质：200 h的稳定转化率为55%，异丁烷的选择性为82%。这主要归因于Cu促进GaOx更好地结合到载体中，较高的Bronsted/刘易斯比，较小的ZrO 2微晶，延迟从四元（对异构化具有活性）到单斜（非活性）ZrO 2的转化以及较高的硫酸盐稳定性。最后将该效果与Pd和Pt的效果进行比较，证明了CuGa/SZ由于其类似的异丁烷产率（40-45%）而用于商业应用的潜在益处。
The use of CuGa promoted sulfated zirconia (CuGa/SZ) catalyst for the isomerization of n-butane to isobutane has potential value as a replacement for the current catalyst for this important reaction (chlorinated alumina). Ga promoted SZ work well but deactivate rapidly. Several related catalysts (SZ, Ga/SZ, Cu/SZ, and CuGa/SZ) were compared. Only CuGa/SZ shows the most interesting properties: The stable conversion is 55%, and the selectivity to isobutane is 82% for 200 h. This is mainly attributed to Cu promoting a better incorporation of GaOx into the support, higher Bronsted/Lewis ratio, smaller ZrO2 crystallite, retard in the transformation from tetragonal (active for isomerization) to monoclinic (inactive) ZrO2 and higher sulfate stability. This effect is finally compared to the effect of Pd and Pt, demonstrating potential benefits of CuGa/SZ for commercial application due to their similar yields of isobutane (40–45%).