摘要
以B掺杂Mo-V-Te-Nb-O复合金属氧化物作为催化剂,研究了丙烯一步氧化制备丙烯酸的反应过程。考察了反应温度、丙烯空速、氧烯比以及水蒸气含量等因素对丙烯转化率和丙烯酸选择性的影响。结果表明,掺杂B能显著提高丙烯转化率;升高温度可以显著提高丙烯转化率,但对丙烯酸的选择性不利;高空速时丙烯转化率较低,但液相产物的选择性较高;而氧烯比过高或过低都不利于反应的进行;水含量增加可持续降低丙烯转化率、提高丙烯酸选择性,但对丙烯酸收率影响不大。在反应温度400℃,丙烯空速2.5 mL/(g·min),氧烯比1.5,水/丙烯(摩尔比)为1的条件下,反应具有较高的转化率(83.6%)和选择性(73.1%),丙烯酸收率为61.1%。
The B-doped Mo-V-Te-Nb-O catalyst was used for one step oxidation of propylene to acrylic acid and the influence of parameters including reaction temperature, space velocity of propylene, oxy- gen/propylene mole ratio and water content on the performance of catalyst were investigated. Result showed that doping B could enhance propylene conversion greatly. Increasing reaction temperature could improve propylene conversion markedly, but was unfavorable for acrylic acid selectivity. High propylene space velocity introduced lower propylene conversion and higher acrylic acid selectivity. Too high or too low oxygen/propylene mole ratios were not conducive to the oxidation reaction. In addi- tion, continually reduction of propylene conversion, increase of acrylic acid selectivity and relatively stable acrylic acid yield were obtained by increasing water/propylene mole ratio. The propylene con- version, acrylic acid selectivity and yield reached 83. 6, 73. 1% and 61. 1%, respectively, while temperature was 400 ℃, propylene space velocity was 2.5 mL · g^-1 o min^-1, oxygen/propylene mole ratio was 1.5 and water/propylene mole ratio was 1.
出处
《精细石油化工》
CAS
CSCD
北大核心
2015年第3期14-18,共5页
Speciality Petrochemicals
基金
辽宁省"百千万人才工程"资助项目(2013921046)
辽宁省高等学校优秀人才支持计划(LR2012012)
关键词
B掺杂
丙烯
一步氧化
丙烯酸
复合金属氧化物
boron doping
propylene
one step oxidation
acrylic acid
metal oxides composite
