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OALib Journal期刊
ISSN: 2333-9721
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改性zro2负载钌氨合成催化剂的制备及其构效关系研究
, PP. 1472-1479
Keywords: 碱液回流,二氧化锆,钌,氨合成,碱性
Abstract:
？由zro(no3)2水解得到的zro(oh)2水凝胶经碱液回流老化、焙烧后制备了改性zro2载体材料,直接浸渍k2ruo4溶液,经还原后用于催化氨合成反应。并运用x射线衍射(xrd)、co2程序升温脱附(co2-tpd)、x射线荧光光谱(xrf)、n2物理吸附、h2程序升温还原技术(h2-tpr)和co化学吸附对其进行了表征,重点考察了催化剂性能与载体性能间的构效关系。结果表明,koh和nh4oh溶液回流均可提高载体的比表面积,但是koh回流制备的载体同时还具有较强的碱性,因此,负载钌以后表现出最佳活性。在425℃、5mpa、空速为10000h-1条件下,出口氨浓度为5.96%,分别较催化剂k-ru/zro2-nh4oh、k-ru/zro2-cp和ru/zro2-nh4oh提高了11%、143%和103%。与活性组分分散度相比,载体碱性强度对活性的促进作用更为明显。
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