系统地研究了还原剂(氯化铵)添加到丙烷选择氧化合成丙烯酸催化剂Mo-V-Te-Nb-O混合氧化物中对催化剂性能的影响.实验结果表明,在制备过程中还原剂的存在明显地影响了所得催化剂晶格氧的活动性,而晶格氧的活动性对Mo-V-Te-Nb-O混合氧化物的催化活性有重要的影响.进一步的研究表明,添加还原剂引起了催化剂形貌和相组成的变化,这些对于丙烯酸的形成有着重要作用.具有较多M1相含量的催化剂在低温(<653 K)时表现出了高丙烯酸选择性,而具有较多M2相含量的催化剂则在高温(>653 K)时更有利于丙烯酸的生成.
The effects of the addition of the reductant (ammonium chloride) on Mo-V-Te-Nb-O mixed oxide catalysts for propane selective oxidation to acrylic acid were systematically investigated.The presence of the reductant during catalyst preparation had a significant impact on the mobility of lattice oxygen mainly responsible for the catalytic activity of the Mo-V-Te-Nb-O catalysts.Furthermore,the addition of the reductant resulted in clear changes in catalyst morphology and phase composition,which are important fac-tors in the formation of acrylic acid.A high content of the orthorhombic M1 phase led to a high selectivity to acrylic acid at low temperatures (<653 K),while a high content of the hexagonal M2 phase promoted the formation of acrylic acid at high temperatures(>653 K).
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