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本文提出了一个在温和条件下,使乙炔还原为乙烯的新型的催化剂体系:CuSO_4-KBH_4-H_2O在常压及15.0—27.5℃温度范围内,求得乙炔选择性加氢成乙烯的表观活化能是16.0千卡/摩尔.25℃的初始转化数是0.48μMC_2H_4/μMCu·min。当CusO_4浓度达10~(-5)M时,反应选择性为98%。实验指出还原反应是顺式加成,氢来自溶剂水,而不是还原剂KBH_4,实验结果还表明活性中心可能是单个的铜原子并非铜原子簇,从而在此基础上提出一个四步反应图式,合理地解释了二价铜离子在Na,MoO_4—L-Cys催化体系中的阻抑作用。
This paper presents a new catalyst system for the reduction of acetylene to ethylene under mild conditions: CuSO_4-KBH_4-H_2O is obtained by the selective activation of acetylene to ethylene at atmospheric pressure and at a temperature in the range of 15.0-27.5 ℃ Can be 16.0 kcal / mol. The initial number of conversions at 25 ° C is 0.48 μM_2H_4 / μM Cu · min. When the concentration of CusO_4 reaches 10 ~ (-5) M, the reaction selectivity is 98%. Experiments show that the reduction reaction is a cis-addition, hydrogen from the solvent water, rather than the reducing agent KBH_4, the experimental results also showed that the active site may be a single copper atom is not a copper cluster, thus proposed a four-step reaction scheme , A reasonable explanation of the divalent copper ions in the Na, MoO_4-L-Cys catalytic system inhibition.