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本文报告了由金属盐直接固相合成负载铑络合物或原子簇催化剂的新方法及IR谱表征。CO容易使表面吸附有水分子的RhCl_3/SiO_2还原并生成表面羰基物Rh~+-(CO)_2/SiO_2;CO、CO/H_2和CO/2H_2等不同还原气对表面络合物的生成没有影响。采用H_2还原只能得到金属Rh催化剂。水是重要影响因素,如果RhCl_3/SiO_2先抽空脱水,再用含水的CO还原,就会使Rh~+(CO)_2/SiO_2转化为Rh_6(CO)_(16)/SiO_2。此外,还考察了负载原子簇的CO加氢和热分解反应性能。采用CO还原RhCl_3/SiO_2制备的催化剂同负载原子簇催化剂的反应行为非常相近,而且比传统催化剂具有更高的反应活性。
In this paper, a new method for the direct solid-phase synthesis of supported rhodium complexes or cluster catalysts from metal salts and characterization by IR spectroscopy has been reported. CO could easily reduce RhCl_3 / SiO_2, which is adsorbed on the surface of water molecules, and produce surface carbonyls Rh ~ + - (CO) _2 / SiO_2. Different reducing gases such as CO, CO / H_2 and CO / influences. H_2 reduction can only get metal Rh catalyst. Water is an important factor. Rh_3 (CO) _2 / SiO_2 can be converted into Rh_6 (CO) _ (16) / SiO_2 if RhCl_3 / SiO_2 is first exhausted and then reduced with aqueous CO. In addition, the properties of CO hydrogenation and thermal decomposition of loaded clusters were also investigated. The catalysts prepared by CO reduction of RhCl_3 / SiO_2 have very similar reactivity with supported cluster catalysts and have higher reactivity than traditional catalysts.