合成γ-丁内酯Cu-Zn-Al-O催化剂表面化学态研究

STUDIES ON THE SURFCE CHEMICAL STATE OF Cu Zn Al O CATALYST FOR Γ BUTYROLACTONE SYNTHESIS

采用ＸＲＤ、ＸＰＳ和ＸＡＥＳ、ＥＳＲ等技术研究１，４丁二醇液相脱氢环化合成γ－丁内酯ＣｕＺｎＡｌＯ催化剂在不同条件下的表面化学态。结果表明：ＣｕＺｎＡｌＯ催化剂前驱体以Ｃｕ＋２形式存在；活化态、反应态表面只是Ｃｕ０，未测出Ｃｕ＋、Ｃｕ２＋；体相中尚存在部分未还原的Ｃｕ＋２；Ｃｕ０微晶有聚集的现象；关联活性测试结果认为：在活化态、反应态中ＺｎＯ、Ａｌ元素与Ｃｕ０的相互作用，可抑制微晶Ｃｕ０的聚集。

XRD、ESR、XPS and XAES were used to examine the surface chemical state of Cu Zn Al O catalyst for synthesizing γ Butyrolactone by the liquid phase dehydrocyclization reaction from 1,4 Butanediol under various conditions. The following results were obtained from experiments: (1) There exist Cu 2+ in the precursor of Cu Zn Al O catalyst. (2) On the surface of the active catalyst only Cu 0 is found, no stable Cu + and Cu 2+ exist. There is Cu 2+ still in the bull of the active catalyst. (3) Cu 0 migrate toward the surface and results in Cu 0 enrichment of the surface. (4) It is found that the interaction among the metallic elements of Cu、Zn、Al prevents micro crystal Cu 0 growth, and improves singnificantly the activity and stabltity of Cu Zn Al O catalyst according to the activity measurement results.