摘要
测定了一系列V-P-O催化剂的丁烷选择氧化总转化率、顺酐选择性和生成速率。用XRD和FT-IR仪对催化剂进行晶相分析。用化学滴定法测定催化剂中钒的平均价态。结果表明,晶形良好的(VO)_2P_2O_2和部分α-VOSO_4的混合物可能是丁烷选择氧化的必要活性相。
A series of V-P-O catalysts in the range of P/V ratio = 0.9, 1.0, 1.1, with different calcination temperature and calcination atmosphere for n-butane oxidation to maleic anhydride were prepared by the method of benzyl alcohol reduction. Crystal phases of the catalysts were determined by XRD and FT-IR. The average valence of vanadium in the catalysts was determined by chemical titration. It was considered that the main factor which was related to seclectivity is the formation of crystalline catalysts, the mixed crystal of (VO)2P2O7 and a part of a-VOPO4 in good crystallinity is active phase in the redox dynamic process. The reaction is the reaction of structure sensitivity.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
1989年第2期168-172,共5页
Chemical Journal of Chinese Universities
关键词
丁烷
选择氧化
钒磷氧催化剂
晶相
Selective oxidation of butane, V-P-O catalysts, Selectivity of maleic anhydride, Average valence of vanadium
