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Effect of the Al2O3 Crystal Phase on the Supported Pd Performance of Semihydrogenation Alkynes
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-12-12 , DOI: 10.1021/acs.iecr.3c02952
Xin Song 1 , Wenjie Pan 1 , Fangjun Shao 1 , Zijiang Zhao 1 , Xiaonian Li 1 , Zhongzhe Wei 1 , Jianguo Wang 1
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2023-12-12 , DOI: 10.1021/acs.iecr.3c02952
Xin Song 1 , Wenjie Pan 1 , Fangjun Shao 1 , Zijiang Zhao 1 , Xiaonian Li 1 , Zhongzhe Wei 1 , Jianguo Wang 1
Affiliation
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The development of alkyne semihydrogenation catalysts with high conversion and selectivity under mild conditions is extremely challenging. Here, the modulation of Pd by different crystalline aluminas was investigated to improve the reaction performance. XPS confirmed that different crystalline aluminas modified the electronic structure of palladium. The Pd0.5/γ-Al2O3 catalyst with a Pd loading of 0.48 wt % attained 98% conversion and 91% selectivity. Stronger interaction of the γ-Al2O3 support with the loaded Pd nanoparticles resulted in electron deflection toward the support. The electronic structure of Pd was altered by modulating the crystallographic shape of the support, resulting in metal nanoparticles containing more Pd2+. Electron-deficient Pd2+ adsorbs more strongly on an electron-rich C≡C, which in turn modulates the competitive adsorption of alkenes and alkynes. Finally, the effective semihydrogenation of phenylacetylene was realized at low temperature and pressure.
中文翻译：
Al2O3晶相对半加氢炔负载Pd性能的影响
开发在温和条件下具有高转化率和选择性的炔烃半加氢催化剂极具挑战性。在这里，研究了不同结晶氧化铝对 Pd 的调节，以提高反应性能。XPS 证实不同的结晶氧化铝改变了钯的电子结构。Pd负载量为0.48wt%的Pd 0.5 /γ-Al 2 O 3催化剂实现了98%的转化率和91%的选择性。γ-Al 2 O 3载体与负载的Pd纳米粒子更强的相互作用导致电子向载体偏转。通过调节载体的晶体形状来改变Pd的电子结构，从而产生含有更多Pd 2+的金属纳米颗粒。缺电子的 Pd 2+在富电子的 C≡C 上吸附更强烈，这反过来又调节了烯烃和炔烃的竞争吸附。最终在低温低压下实现了苯乙炔的有效半加氢。
更新日期：2023-12-12
中文翻译：
Al2O3晶相对半加氢炔负载Pd性能的影响
开发在温和条件下具有高转化率和选择性的炔烃半加氢催化剂极具挑战性。在这里，研究了不同结晶氧化铝对 Pd 的调节，以提高反应性能。XPS 证实不同的结晶氧化铝改变了钯的电子结构。Pd负载量为0.48wt%的Pd 0.5 /γ-Al 2 O 3催化剂实现了98%的转化率和91%的选择性。γ-Al 2 O 3载体与负载的Pd纳米粒子更强的相互作用导致电子向载体偏转。通过调节载体的晶体形状来改变Pd的电子结构，从而产生含有更多Pd 2+的金属纳米颗粒。缺电子的 Pd 2+在富电子的 C≡C 上吸附更强烈，这反过来又调节了烯烃和炔烃的竞争吸附。最终在低温低压下实现了苯乙炔的有效半加氢。
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