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Abstract
Zinc acetate (Zn(OAc)2) loaded on activated carbon (AC) is the most commonly used catalyst for the industrial synthesis of vinyl acetate (VAc) using the acetylene method. The aim of this study is to optimize the Zn(OAc)2/AC catalyst by adding co-catalysts to improve its activity and stability. Ternary catalysts were synthesized by adding Co and Ni to the Zn(OAc)2/AC catalyst (Zn-Co-Ni/AC). Due to the strong synergistic effect among promoter Co, Ni, and the active component of Zn(OAc)2, the resulting catalyst is capable to absorb more acetic acid and less acetylene. The stability and activity of Zn-Co-Ni/AC catalyst have been improved through electron transfer to alter the electron cloud density around the Zn element. Under the same reaction conditions, the activity of Zn-Co-Ni/AC catalyst was enhanced by 83% compared to that of Zn(OAc)2/AC, and the activity was still as high as 30.1% after 120 h of testing.
Highlights
IntroductionXu et al [8] loaded ionic liquid containing the active ingredient Zn(OAc) into porous silica gel to form a supported ionic liquid catalyst which exhibited good selectivity
Catalyst in Acetylene Acetylation.As one of the biggest organic chemistry intermediates in the world, vinyl acetate (VAc) has been used to produce a lot of downstream productions that are widely used in medicine, textile, machinery, construction, leather processing, and other fields [1,2,3,4]
The ma mum value of Zn(OAc)2/activated carbon (AC) catalyst acetic acid conversion rate is 19.9%, after 120 h reaction, the conversion rate drops to 11.8%, only 59.3% of the highest conversion ra these results show that adding the appropriate amount of Co and Ni can greatly impro of reaction, the conversion rate drops to 11.8%, only 59.3% of the highest conversion rate, these results show that adding the appropriate amount of Co and Ni can greatly improve the stability of zinc acetate catalyst
Summary
Xu et al [8] loaded ionic liquid containing the active ingredient Zn(OAc) into porous silica gel to form a supported ionic liquid catalyst which exhibited good selectivity. In the synthesis process of VAc by acetylene method, our group have done some work on active components selection and carrier modification. Wang et al [23] prepared nitrogen-doped AC by modifying AC with dicyandiamide (N-AC) and used it for loading Zn(OAc) , which exhibited good performance. For the acetylene-acetic acid based synthesis of VAc, the activity of different metal active components increase in the order: Hg(II) > Bi > Cd > Zn > Ni > Mg > Co > Fe > Ca > Ba [9]. We synthesized Zn-Co-Ni/AC catalyst, which shows good activity and stability
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