摘要
实验考察了以正戊醇为还原剂的前驱体制备过程中磷酸浓度对催化剂性能的影响 .在较高的磷酸浓度范围内制得的催化剂 ,V4+相 (VO) 2 P2 O7的量较大 ,正丁烷的转化率都较高 .磷酸浓度减少 ,V5+相δ VOPO4的相对量逐渐增大 ,正丁烷的转化率随之升高 ,而对顺酐的选择性开始时升高 ,达到最大点后则逐渐降低 .在最佳磷酸浓度 10 1 7%时制备出的催化剂 ,在进气丁烷浓度为 4 0 %、空速为 5 0 0h-1的反应条件下 ,顺酐的最高收率为4 7 6 7% (mol) .
The effects of orthophosphoric acid concentration in precursor preparation with n-pentanol as reductive agent on vanadium catalyst behavior were studied. For the catalysts prepared at higher concentrations of the acid, the quantity of V4 phase (VO)2P2O7 is very large, and conversions of n-butane to maleic anhydride (MA) are all comparatively high. With the decrease of acid concentration in precursor preparation, the relative amount of V5+ phase δ-VOPO4 and n-butane conversion increases continuously, whereas the selectivity to MA increases at the beginning and then decreases when it reaches a maximum value. The catalyst prepared at the optimal acid concentration of 101.7% gave the maximum yield of MA of 47.67% (mol) at an inlet n-butane concentration of 4.0% and space velocity of 500 h-1.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2003年第8期1093-1097,共5页
CIESC Journal
关键词
正丁烷
顺酐
选择氧化
流化床催化剂
正戊醇
Butane
Concentration (process)
Fluidized beds
Oxidation
Vanadium
